v2.4.0.6
Quantitative Information about Recurring Level Three Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Corporate Securities [Member]
Dec. 31, 2011
Corporate Securities [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Cost Sales Income Approach Valuation Technique [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Cost Sales Income Approach Valuation Technique [Member]
Commercial [Member]
Impaired Loans [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Cost Sales Income Approach Valuation Technique [Member]
Nonresidential Real Estate [Member]
Commercial Mortgage Loans, Owner Occupied [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Cost Sales Income Approach Valuation Technique [Member]
Nonresidential Real Estate [Member]
Commercial Mortgage Loans, Non Owner Occupied [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Cost Sales Income Approach Valuation Technique [Member]
Residential Real Estate [Member]
Multi Family [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Cost Sales Income Approach Valuation Technique [Member]
Residential Real Estate [Member]
Residential Real Estate Other Financing Receivable [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Cost Sales Income Approach Valuation Technique [Member]
Construction [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Corporate Securities [Member]
Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member]
Corporate Securities [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Corporate Securities [Member]
Discounted Cash Flows Valuation Technique [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Minimum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Commercial [Member]
Impaired Loans [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Minimum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Nonresidential Real Estate [Member]
Commercial Mortgage Loans, Owner Occupied [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Minimum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Nonresidential Real Estate [Member]
Commercial Mortgage Loans, Non Owner Occupied [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Minimum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Residential Real Estate [Member]
Multi Family [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Minimum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Residential Real Estate [Member]
Residential Real Estate Other Financing Receivable [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Minimum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Construction [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Maximum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Commercial [Member]
Impaired Loans [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Maximum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Nonresidential Real Estate [Member]
Commercial Mortgage Loans, Owner Occupied [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Maximum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Nonresidential Real Estate [Member]
Commercial Mortgage Loans, Non Owner Occupied [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Maximum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Residential Real Estate [Member]
Multi Family [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Maximum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Residential Real Estate [Member]
Residential Real Estate Other Financing Receivable [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Maximum [Member]
Cost Sales Income Approach Valuation Technique [Member]
Construction [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) [Member]
Corporate Securities [Member]
Discounted Cash Flows Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]                                                          
Investment securities available-for-sale $ 302,544 $ 322,512 $ 1,060 $ 1,060                   $ 1,060 $ 1,060                           $ 1,060
Probability of default                               0.00%                          
Impaired loans $ 1,149,104 $ 1,112,788         $ 17,111 $ 875 $ 8,255 $ 9,645 $ 577 $ 2,417 $ 4,470                                
Unobservable Input, discounts ranging         5.00% 10.00%                     5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Valuation Techniques               Cost, sales, income approach Cost, sales, income approach Cost, sales, income approach Cost, sales, income approach Cost, sales, income approach Cost, sales, income approach