Quarterly report pursuant to Section 13 or 15(d)

Analysis of Allowance For Loan Losses By Portfolio Segment (Detail)

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Analysis of Allowance For Loan Losses By Portfolio Segment (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 $ 23,239 $ 19,516 $ 22,030 $ 18,077  
Chargeoffs (474) (814) (4,851) (3,339)  
Recoveries 654 24 774 263  
Provision 1,185 2,740 6,651 6,465  
Ending Balance 24,604 21,466 24,604 21,466  
Allowance for loan losses: 24,604 21,466 24,604 21,466  
Individually Evaluated for Impairment 3,925   3,925   4,181
Collectively Evaluated for Impairment 20,679   20,679   17,849
Ending Balance 2,161,130   2,161,130   1,830,742
Individually Evaluated for Impairment 38,750   38,750   37,253
Collectively Evaluated for Impairment 2,122,380   2,122,380   1,793,489
Commercial Financial And Agricultural Financing Receivable [Member]
         
Allowance for loan losses:          
Beginning Balance 6,511 5,822 6,627 5,348  
Chargeoffs 349 37 (898) (897)  
Recoveries 24 12 (124) (12)  
Provision 1,090 464 (1,423) (1,798)  
Ending Balance 7,276 6,261 7,276 6,261  
Allowance for loan losses: 7,276 6,261 7,276 6,261  
Individually Evaluated for Impairment 714   714   1,382
Collectively Evaluated for Impairment 6,562   6,562   5,245
Ending Balance 910,220   910,220   799,464
Individually Evaluated for Impairment 4,063   4,063   5,578
Collectively Evaluated for Impairment 906,157   906,157   793,886
Commercial Real Estate Construction Financing Receivable [Member]
         
Allowance for loan losses:          
Beginning Balance 7,582 6,468 6,542 6,373  
Chargeoffs (16) (678) (2,935) (1,999)  
Recoveries 47 10 55 174  
Provision (1,560) 479 2,391 1,731  
Ending Balance 6,053 6,279 6,053 6,279  
Allowance for loan losses: 6,053 6,279 6,053 6,279  
Individually Evaluated for Impairment 1,177   1,177   1,533
Collectively Evaluated for Impairment 4,876   4,876   5,009
Ending Balance 153,351   153,351   151,218
Individually Evaluated for Impairment 16,006   16,006   16,262
Collectively Evaluated for Impairment 137,345   137,345   134,956
Residential Real Estate Mortgage Loans [Member]
         
Allowance for loan losses:          
Beginning Balance 3,640 3,187 3,295 2,443  
Chargeoffs (30) (88) (311) (103)  
Recoveries 582 (1) (588) (2)  
Provision 615 (964) (1,235) (1,722)  
Ending Balance 4,807 4,064 4,807 4,064  
Allowance for loan losses: 4,807 4,064 4,807 4,064  
Individually Evaluated for Impairment 1,953   1,953   941
Collectively Evaluated for Impairment 2,854   2,854   2,354
Ending Balance 1,055,087   1,055,087   839,034
Individually Evaluated for Impairment 18,353   18,353   14,866
Collectively Evaluated for Impairment 1,036,734   1,036,734   824,168
Consumer Portfolio Segment [Member]
         
Allowance for loan losses:          
Beginning Balance 285 551 531 749  
Chargeoffs (79) (11) (707) (340)  
Recoveries 1 1 7 75  
Provision 96 482 472 539  
Ending Balance 303 1,023 303 1,023  
Allowance for loan losses: 303 1,023 303 1,023  
Individually Evaluated for Impairment 81   81   325
Collectively Evaluated for Impairment 222   222   206
Ending Balance 42,472   42,472   41,026
Individually Evaluated for Impairment 328   328   547
Collectively Evaluated for Impairment 42,144   42,144   40,479
Unallocated Financing Receivables [Member]
         
Allowance for loan losses:          
Beginning Balance 5,221 3,488 5,035 3,164  
Chargeoffs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 944 351 1,130 675  
Ending Balance 6,165 3,839 6,165 3,839  
Allowance for loan losses: 6,165 3,839 6,165 3,839  
Individually Evaluated for Impairment 0   0   0
Collectively Evaluated for Impairment 6,165   6,165   5,035
Ending Balance 0   0   0
Individually Evaluated for Impairment 0   0   0
Collectively Evaluated for Impairment $ 0   $ 0   $ 0