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Allowance for Loan Losses, by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Allowance Excluding Acquired Impaired
Sep. 30, 2013
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Allowance Excluding Acquired Impaired
Sep. 30, 2013
Acquired Impaired Allowance
Sep. 30, 2013
Acquired Impaired Allowance
Sep. 30, 2012
Acquired Impaired Allowance
Jun. 30, 2012
Acquired Impaired Allowance
Sep. 30, 2013
Commercial Loans
Sep. 30, 2012
Commercial Loans
Sep. 30, 2013
Commercial Loans
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Commercial Loans
Allowance Excluding Acquired Impaired
Sep. 30, 2013
Commercial Loans
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Commercial Loans
Allowance Excluding Acquired Impaired
Sep. 30, 2013
Commercial Loans
Acquired Impaired Allowance
Sep. 30, 2013
Commercial Loans
Acquired Impaired Allowance
Sep. 30, 2012
Commercial Loans
Acquired Impaired Allowance
Jun. 30, 2012
Commercial Loans
Acquired Impaired Allowance
Sep. 30, 2013
Consumer Real Estate
Sep. 30, 2012
Consumer Real Estate
Sep. 30, 2013
Consumer Real Estate
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Consumer Real Estate
Allowance Excluding Acquired Impaired
Sep. 30, 2013
Consumer Real Estate
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Consumer Real Estate
Allowance Excluding Acquired Impaired
Sep. 30, 2013
Consumer Real Estate
Acquired Impaired Allowance
Sep. 30, 2013
Consumer Real Estate
Acquired Impaired Allowance
Sep. 30, 2013
Consumer and Other
Sep. 30, 2012
Consumer and Other
Sep. 30, 2013
Consumer and Other
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Consumer and Other
Allowance Excluding Acquired Impaired
Sep. 30, 2013
Consumer and Other
Allowance Excluding Acquired Impaired
Sep. 30, 2012
Consumer and Other
Allowance Excluding Acquired Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]                                                                    
Beginning balance $ 25,770   $ 23,114 $ 26,163 $ 25,762 $ 26,004 $ 8 $ 8 $ 201 $ 8 $ 16,223 $ 17,707 $ 15,873 $ 18,249 $ 17,259 $ 17,551 $ 8 $ 8 $ 201 $ 8 $ 7,793 $ 7,498 $ 6,658 $ 7,272 $ 7,906 $ 7,711     $ 649 $ 630 $ 583 $ 642 $ 597 $ 742
Acquired impaired provision             1,035 1,035 (193)               158 158 (193)               877 877            
Benefit attributable to FDIC indemnificaton asset             (812) (812)                 (242) (242)                 (570) (570)            
Provision for loan losses charged to operations     2,110 1,916 6,457 4,651 223 223 (193)       1,551 436 4,338 1,928 (84) (84) (193)       (807) 1,289 422 2,475 307 307     1,366 191 1,697 248
Provision for loan losses recorded through the FDIC indemnificaton asset 6,680 4,458         812 812                 242 242                 570 570            
Loans charged off     (1,955) (2,613) (9,720) (5,787)             (1,503) (1,184) (5,732) (2,353)             1,035 (1,126) (1,643) (2,802)         (1,487) (303) (2,345) (632)
Recoveries credited to allowance     353 361 1,123 959             136 198 192 573             30 63 231 114         187 100 700 272
Net charge-offs     (1,602) (2,252) (8,597) (4,828)             (1,367) (986) (5,540) (1,780)             1,065 (1,063) (1,412) (2,688)         (1,300) (203) (1,645) (360)
Ending balance $ 24,665 $ 25,835 $ 23,622 $ 25,827 $ 23,622 $ 25,827 $ 1,043 $ 1,043 $ 8 $ 8 $ 16,223 $ 17,707 $ 16,057 $ 17,699 $ 16,057 $ 17,699 $ 166 $ 166 $ 8 $ 8 $ 7,793 $ 7,498 $ 6,916 $ 7,498 $ 6,916 $ 7,498 $ 877 $ 877 $ 649 $ 630 $ 649 $ 630 $ 649 $ 630