v2.4.0.6
Quantitative Information about Recurring Level Three Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended6 Months Ended6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Corporate Securities
Dec. 31, 2011
Corporate Securities
Jun. 30, 2012
Minimum
Jun. 30, 2012
Maximum
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Cost Sales Income Approach Valuation Technique
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Cost Sales Income Approach Valuation Technique
Commercial
Impaired Loans
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Cost Sales Income Approach Valuation Technique
Nonresidential real estate
Commercial Mortgage Loans, Owner Occupied
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Cost Sales Income Approach Valuation Technique
Nonresidential real estate
Commercial Mortgage Loans, Non Owner Occupied
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Cost Sales Income Approach Valuation Technique
Residential real estate
Multi Family
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Cost Sales Income Approach Valuation Technique
Residential real estate
Residential Real Estate Other Financing Receivable
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Cost Sales Income Approach Valuation Technique
Construction
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Corporate Securities
Dec. 31, 2011
Significant Unobservable Inputs (Level 3)
Corporate Securities
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Corporate Securities
Discounted Cash Flows Valuation Technique
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Minimum
Cost Sales Income Approach Valuation Technique
Commercial
Impaired Loans
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Minimum
Cost Sales Income Approach Valuation Technique
Nonresidential real estate
Commercial Mortgage Loans, Owner Occupied
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Minimum
Cost Sales Income Approach Valuation Technique
Nonresidential real estate
Commercial Mortgage Loans, Non Owner Occupied
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Minimum
Cost Sales Income Approach Valuation Technique
Residential real estate
Multi Family
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Minimum
Cost Sales Income Approach Valuation Technique
Residential real estate
Residential Real Estate Other Financing Receivable
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Minimum
Cost Sales Income Approach Valuation Technique
Construction
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Maximum
Cost Sales Income Approach Valuation Technique
Commercial
Impaired Loans
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Maximum
Cost Sales Income Approach Valuation Technique
Nonresidential real estate
Commercial Mortgage Loans, Owner Occupied
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Maximum
Cost Sales Income Approach Valuation Technique
Nonresidential real estate
Commercial Mortgage Loans, Non Owner Occupied
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Maximum
Cost Sales Income Approach Valuation Technique
Residential real estate
Multi Family
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Maximum
Cost Sales Income Approach Valuation Technique
Residential real estate
Residential Real Estate Other Financing Receivable
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Maximum
Cost Sales Income Approach Valuation Technique
Construction
Jun. 30, 2012
Fair Value, Measurements, Recurring
Significant Unobservable Inputs (Level 3)
Corporate Securities
Discounted Cash Flows Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]                             
Investment securities available-for-sale$ 321,322$ 322,512$ 1,060$ 1,060         $ 1,060$ 1,060             $ 1,060
Probability of default               0.00%             
Impaired loans$ 1,129,064$ 1,112,788    $ 17,111$ 344$ 7,279$ 6,763$ 1,543$ 490$ 692                
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