v2.4.0.6
Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Allowance for loan losses          
Beginning balance $ 18,346 $ 17,816 $ 18,288 $ 17,368  
Provision for loan losses 2,200 2,550 5,700 8,550  
Loans charged off (4,239) (2,564) (7,877) (8,393)  
Recoveries 278 139 474 416  
Ending balance 16,585 17,941 16,585 17,941  
Financing Receivable Allowance For Credit Loss Additional Information [Abstract]          
Individually evaluated for impairment 6,254 7,762 6,254 7,762 7,443
Collectively evaluated for impairment 10,331   10,331   10,845
Total ending allowance balance 16,585 17,941 16,585 17,941  
Loans          
Loans individually evaluated for impairment 34,503 39,173 34,503 39,173 35,261
Loans collectively evaluated for impairment 1,126,028   1,126,028   1,096,140
Total 1,160,531   1,160,531   1,131,401
Commercial [Member]
         
Allowance for loan losses          
Beginning balance 2,159 3,931 3,207 3,440  
Provision for loan losses (215) 262 (892) 1,649  
Loans charged off (89) 1,014 (461) (1,934)  
Recoveries 18 28 19 52  
Ending balance 1,873 3,207 1,873 3,207  
Financing Receivable Allowance For Credit Loss Additional Information [Abstract]          
Individually evaluated for impairment 317   317   224
Collectively evaluated for impairment 1,556   1,556   2,983
Total ending allowance balance 1,873 3,207 1,873 3,207  
Loans          
Loans individually evaluated for impairment 1,118   1,118   917
Loans collectively evaluated for impairment 180,052   180,052   192,259
Total 181,170   181,170   193,176
Residential Real Estate [Member]
         
Allowance for loan losses          
Beginning balance 3,786 2,403 2,591 2,431  
Provision for loan losses 2,095 384 3,782 780  
Loans charged off (1,051) (210) (1,573) (674)  
Recoveries 3 2 33 42  
Ending balance 4,833 2,579 4,833 2,579  
Financing Receivable Allowance For Credit Loss Additional Information [Abstract]          
Individually evaluated for impairment 1,729   1,729   477
Collectively evaluated for impairment 3,104   3,104   2,114
Total ending allowance balance 4,833 2,579 4,833 2,579  
Loans          
Loans individually evaluated for impairment 8,500   8,500   6,100
Loans collectively evaluated for impairment 273,245   273,245   260,168
Total 281,745   281,745   266,268
Nonresidential Real Estate [Member]
         
Allowance for loan losses          
Beginning balance 6,666 6,782 7,614 8,126  
Provision for loan losses 875 1,590 1,095 2,728  
Loans charged off (436) (586) (1,609) (3,070)  
Recoveries 183 16 188 18  
Ending balance 7,288 7,802 7,288 7,802  
Financing Receivable Allowance For Credit Loss Additional Information [Abstract]          
Individually evaluated for impairment 2,993   2,993   2,994
Collectively evaluated for impairment 4,295   4,295   4,620
Total ending allowance balance 7,288 7,802 7,288 7,802  
Loans          
Loans individually evaluated for impairment 19,111   19,111   20,390
Loans collectively evaluated for impairment 536,123   536,123   503,095
Total 555,234   555,234   523,485
Construction [Member]
         
Allowance for loan losses          
Beginning balance 5,167 4,496 4,701 3,150  
Provision for loan losses (729) 181 977 3,025  
Loans charged off (2,292) (501) (3,538) (2,000)  
Recoveries 2 0 8 1  
Ending balance 2,148 4,176 2,148 4,176  
Financing Receivable Allowance For Credit Loss Additional Information [Abstract]          
Individually evaluated for impairment 1,215   1,215   3,748
Collectively evaluated for impairment 933   933   953
Total ending allowance balance 2,148 4,176 2,148 4,176  
Loans          
Loans individually evaluated for impairment 5,774   5,774   7,854
Loans collectively evaluated for impairment 92,835   92,835   96,934
Total 98,609   98,609   104,788
Consumer [Member]
         
Allowance for loan losses          
Beginning balance 392 167 162 166  
Provision for loan losses 325 154 726 407  
Loans charged off (371) (253) (696) (715)  
Recoveries 72 93 226 303  
Ending balance 418 161 418 161  
Financing Receivable Allowance For Credit Loss Additional Information [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 418   418   162
Total ending allowance balance 418 161 418 161  
Loans          
Loans individually evaluated for impairment 0   0   0
Loans collectively evaluated for impairment 16,170   16,170   16,618
Total 16,170   16,170   16,618
Municipal Obligations [Member]
         
Allowance for loan losses          
Beginning balance 176 37 13 55  
Provision for loan losses (151) (21) 12 (39)  
Loans charged off 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance 25 16 25 16  
Financing Receivable Allowance For Credit Loss Additional Information [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 25   25   13
Total ending allowance balance 25 16 25 16  
Loans          
Loans individually evaluated for impairment 0   0   0
Loans collectively evaluated for impairment 27,603   27,603   27,066
Total $ 27,603   $ 27,603   $ 27,066