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Allowance for Loan Losses - Impaired Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded $ 48,095 $ 59,734 $ 48,466
Unpaid principal, With no related allowance recorded 57,909 72,767 61,660
Average recorded Investment, With no related allowance recorded 48,279 65,857 57,354
Interest income Recognized, With no related allowance recorded 836 711 1,095
Recorded investment, With an allowance recorded 9,999 11,076 11,021
Unpaid principal, With an allowance recorded 10,938 12,107 11,863
Related allowance, With an allowance recorded 3,518 3,394 3,646
Average recorded Investment, With an allowance recorded 10,510 13,504 11,938
Interest income Recognized, With an allowance recorded 166 181 409
PNCI loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 4,626 985 1,124
Unpaid principal, With no related allowance recorded 4,813 3,183 3,433
Average recorded Investment, With no related allowance recorded 2,875 1,254 1,344
Interest income Recognized, With no related allowance recorded 78 5 14
Recorded investment, With an allowance recorded 2,306 1,073 1,636
Unpaid principal, With an allowance recorded 2,334 1,094 1,654
Related allowance, With an allowance recorded 727 546 621
Average recorded Investment, With an allowance recorded 1,972 793 1,107
Interest income Recognized, With an allowance recorded 31 17 48
RE Mortgage [Member] | Residential [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 3,770 4,002 3,287
Unpaid principal, With no related allowance recorded 5,901 6,227 5,138
Average recorded Investment, With no related allowance recorded 3,528 4,228 3,826
Interest income Recognized, With no related allowance recorded 19 23 38
Recorded investment, With an allowance recorded 2,780 2,821 2,724
Unpaid principal, With an allowance recorded 2,958 2,893 2,865
Related allowance, With an allowance recorded 784 625 797
Average recorded Investment, With an allowance recorded 2,752 2,594 2,677
Interest income Recognized, With an allowance recorded 40 34 91
RE Mortgage [Member] | Residential [Member] | PNCI loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 290 144 343
Unpaid principal, With no related allowance recorded 316 144 353
Average recorded Investment, With no related allowance recorded 317 94 246
Interest income Recognized, With no related allowance recorded 3 6 14
Recorded investment, With an allowance recorded 627 430 834
Unpaid principal, With an allowance recorded 643 442 852
Related allowance, With an allowance recorded 72 155 177
Average recorded Investment, With an allowance recorded 731 352 516
Interest income Recognized, With an allowance recorded 4 4 8
RE Mortgage [Member] | Commercial [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 40,294 48,781 38,477
Unpaid principal, With no related allowance recorded 44,441 51,862 41,949
Average recorded Investment, With no related allowance recorded 39,385 54,387 45,915
Interest income Recognized, With no related allowance recorded 795 651 995
Recorded investment, With an allowance recorded 2,365 3,163 2,943
Unpaid principal, With an allowance recorded 2,448 3,324 3,101
Related allowance, With an allowance recorded 216 282 302
Average recorded Investment, With an allowance recorded 2,654 5,012 4,119
Interest income Recognized, With an allowance recorded 56 76 144
RE Mortgage [Member] | Commercial [Member] | PNCI loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 3,633 478 366
Unpaid principal, With no related allowance recorded 3,713 2,648 2,620
Average recorded Investment, With no related allowance recorded 1,999 822 753
Interest income Recognized, With no related allowance recorded 74    
Recorded investment, With an allowance recorded 826 148 146
Unpaid principal, With an allowance recorded 836 148 146
Related allowance, With an allowance recorded 203 110 108
Average recorded Investment, With an allowance recorded 486 153 148
Interest income Recognized, With an allowance recorded 12 4 8
Home equity lines of credit [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 2,475 2,641 3,001
Unpaid principal, With no related allowance recorded 5,340 5,592 6,094
Average recorded Investment, With no related allowance recorded 2,738 3,419 3,355
Interest income Recognized, With no related allowance recorded 2 5 26
Recorded investment, With an allowance recorded 2,513 3,559 3,185
Unpaid principal, With an allowance recorded 2,973 4,231 3,533
Related allowance, With an allowance recorded 1,481 1,810 1,769
Average recorded Investment, With an allowance recorded 2,849 3,196 2,982
Interest income Recognized, With an allowance recorded 25 35 71
Home equity lines of credit [Member] | PNCI loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 637 320 346
Unpaid principal, With no related allowance recorded 696 337 374
Average recorded Investment, With no related allowance recorded 492 291 287
Interest income Recognized, With no related allowance recorded 1 (1) (1)
Recorded investment, With an allowance recorded 511 467 436
Unpaid principal, With an allowance recorded 512 476 436
Related allowance, With an allowance recorded 298 278 205
Average recorded Investment, With an allowance recorded 474 260 319
Interest income Recognized, With an allowance recorded 9 8 20
Home equity loans [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 779 626 750
Unpaid principal, With no related allowance recorded 1,256 1,032 1,187
Average recorded Investment, With no related allowance recorded 764 540 651
Interest income Recognized, With no related allowance recorded   1 6
Recorded investment, With an allowance recorded 598 245 504
Unpaid principal, With an allowance recorded 704 325 597
Related allowance, With an allowance recorded 346 211 284
Average recorded Investment, With an allowance recorded 551 204 365
Interest income Recognized, With an allowance recorded 3 2 13
Home equity loans [Member] | PNCI loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 20   25
Unpaid principal, With no related allowance recorded 22   25
Average recorded Investment, With no related allowance recorded 22   12
Recorded investment, With an allowance recorded 41    
Unpaid principal, With an allowance recorded 42    
Related allowance, With an allowance recorded 41    
Average recorded Investment, With an allowance recorded 20    
Auto Indirect [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded   33 14
Unpaid principal, With no related allowance recorded   70 49
Average recorded Investment, With no related allowance recorded   49 35
Recorded investment, With an allowance recorded   7 4
Unpaid principal, With an allowance recorded   10 6
Average recorded Investment, With an allowance recorded   5 4
Other Consumer [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 23 16 25
Unpaid principal, With no related allowance recorded 46 22 32
Average recorded Investment, With no related allowance recorded 31 21 21
Interest income Recognized, With no related allowance recorded     1
Recorded investment, With an allowance recorded 37   41
Unpaid principal, With an allowance recorded 47   41
Related allowance, With an allowance recorded 15   11
Average recorded Investment, With an allowance recorded 41 6 25
Other Consumer [Member] | PNCI loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 42 33 37
Unpaid principal, With no related allowance recorded 62 44 54
Average recorded Investment, With no related allowance recorded 40 35 36
Recorded investment, With an allowance recorded 301 28 220
Unpaid principal, With an allowance recorded 301 28 220
Related allowance, With an allowance recorded 113 3 131
Average recorded Investment, With an allowance recorded 261 28 124
Interest income Recognized, With an allowance recorded 6 1 12
C&I [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 338 1,151 412
Unpaid principal, With no related allowance recorded 366 1,174 433
Average recorded Investment, With no related allowance recorded 375 1,266 1,030
Interest income Recognized, With no related allowance recorded 11 31 26
Recorded investment, With an allowance recorded 1,706 998 1,338
Unpaid principal, With an allowance recorded 1,808 1,041 1,438
Related allowance, With an allowance recorded 676 405 423
Average recorded Investment, With an allowance recorded 1,522 1,524 1,428
Interest income Recognized, With an allowance recorded 42 25 71
C&I [Member] | PNCI loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 4 10 7
Unpaid principal, With no related allowance recorded 4 10 7
Average recorded Investment, With no related allowance recorded 5 12 10
Interest income Recognized, With no related allowance recorded     1
Construction [Member] | Residential [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 328 2,468 2,401
Unpaid principal, With no related allowance recorded 376 6,689 6,588
Average recorded Investment, With no related allowance recorded 1,364 1,904 2,437
Interest income Recognized, With no related allowance recorded 9    
Recorded investment, With an allowance recorded   283 282
Unpaid principal, With an allowance recorded   283 282
Related allowance, With an allowance recorded   61 60
Average recorded Investment, With an allowance recorded 141 890 283
Interest income Recognized, With an allowance recorded   9 19
Construction [Member] | Commercial [Member] | Originated loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recorded investment, With no related allowance recorded 88 16 99
Unpaid principal, With no related allowance recorded 183 99 190
Average recorded Investment, With no related allowance recorded $ 94 43 84
Interest income Recognized, With no related allowance recorded     3
Average recorded Investment, With an allowance recorded   $ 73 $ 55