Loans - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($)
$ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
$ 3,131
|
$ 4,116
|
$ 3,786
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
1,329
|
1,444
|
2,243
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
1,329
|
3,246
|
2,733
|
| Non-Accrual TDRs, Extension of Maturity |
1,089
|
3,650
|
1,774
|
| Non-Accrual TDRs, Total |
6,878
|
12,456
|
10,536
|
| Accrual TDRs, Deferral of Principal |
4,241
|
9,004
|
5,524
|
| Accrual TDRs, Deferral of Principal and Interest |
214
|
226
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
3,222
|
1,549
|
4,966
|
| Accrual TDRs, Extension of Maturity |
2,622
|
3,038
|
8,927
|
| Accrual TDRs |
10,299
|
13,817
|
19,417
|
| Real estate loans [Member] | Retail [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
0
|
0
|
0
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
344
|
2,032
|
750
|
| Non-Accrual TDRs, Total |
344
|
2,032
|
750
|
| Accrual TDRs, Deferral of Principal |
0
|
306
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
1,227
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
0
|
0
|
474
|
| Accrual TDRs |
1,227
|
306
|
474
|
| Real estate loans [Member] | Hotel/motel [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
1,216
|
1,115
|
1,272
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
28
|
(53)
|
758
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Non-Accrual TDRs, Total |
1,244
|
1,062
|
2,030
|
| Accrual TDRs, Deferral of Principal |
414
|
1,807
|
1,000
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Accrual TDRs |
414
|
1,807
|
1,000
|
| Real estate loans [Member] | Gas station [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
959
|
1,075
|
1,291
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
729
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Non-Accrual TDRs, Total |
959
|
1,075
|
2,020
|
| Accrual TDRs, Deferral of Principal |
0
|
2,335
|
365
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
0
|
0
|
2,609
|
| Accrual TDRs |
0
|
2,335
|
2,974
|
| Real estate loans [Member] | Other [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
0
|
943
|
403
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
1,301
|
1,498
|
1,279
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
216
|
433
|
555
|
| Non-Accrual TDRs, Extension of Maturity |
8
|
24
|
0
|
| Non-Accrual TDRs, Total |
1,525
|
2,898
|
2,237
|
| Accrual TDRs, Deferral of Principal |
3,537
|
2,343
|
2,956
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
322
|
782
|
1,253
|
| Accrual TDRs, Extension of Maturity |
1,378
|
1,372
|
2,027
|
| Accrual TDRs |
5,237
|
4,497
|
6,236
|
| Real estate loans [Member] | Residential property [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
689
|
742
|
795
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Non-Accrual TDRs, Total |
689
|
742
|
795
|
| Accrual TDRs, Deferral of Principal |
0
|
0
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
299
|
308
|
0
|
| Accrual TDRs |
299
|
308
|
0
|
| Commercial and industrial loans [Member] | Commercial term [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
45
|
14
|
25
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
0
|
(1)
|
206
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
997
|
2,556
|
1,449
|
| Non-Accrual TDRs, Extension of Maturity |
679
|
1,481
|
851
|
| Non-Accrual TDRs, Total |
1,721
|
4,050
|
2,531
|
| Accrual TDRs, Deferral of Principal |
40
|
57
|
1,203
|
| Accrual TDRs, Deferral of Principal and Interest |
214
|
226
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
1,673
|
567
|
2,286
|
| Accrual TDRs, Extension of Maturity |
945
|
1,358
|
3,817
|
| Accrual TDRs |
2,872
|
2,208
|
7,306
|
| Commercial and industrial loans [Member] | Commercial lines of credit [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
222
|
227
|
0
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
126
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
58
|
113
|
173
|
| Non-Accrual TDRs, Total |
280
|
466
|
173
|
| Accrual TDRs, Deferral of Principal |
0
|
2,156
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
191
|
| Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Accrual TDRs |
0
|
2,156
|
191
|
| Commercial and industrial loans [Member] | International loans [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
0
|
0
|
0
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Non-Accrual TDRs, Total |
0
|
0
|
0
|
| Accrual TDRs, Deferral of Principal |
0
|
0
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
200
|
1,087
|
| Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Accrual TDRs |
0
|
200
|
1,087
|
| Consumer loans [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
0
|
0
|
0
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
116
|
131
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Non-Accrual TDRs, Total |
116
|
131
|
0
|
| Accrual TDRs, Deferral of Principal |
250
|
0
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
149
|
| Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Accrual TDRs |
$ 250
|
$ 0
|
$ 149
|