Loans and Leases - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
$ 1,828
|
$ 3,131
|
$ 4,116
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
4,444
|
1,329
|
1,444
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
212
|
1,329
|
3,246
|
| Non-Accrual TDRs, Extension of Maturity |
419
|
1,089
|
3,650
|
| Non-Accrual TDRs, Total |
6,903
|
6,878
|
12,456
|
| Accrual TDRs, Deferral of Principal |
4,817
|
4,241
|
9,004
|
| Accrual TDRs, Deferral of Principal and Interest |
198
|
214
|
226
|
| Accrual TDRs, Reduction of Principal and Interest |
3,768
|
3,222
|
1,549
|
| Accrual TDRs, Extension of Maturity |
2,363
|
2,622
|
3,038
|
| Accrual TDRs |
11,146
|
10,299
|
13,817
|
| 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 |
0
|
344
|
2,032
|
| Non-Accrual TDRs, Total |
0
|
344
|
2,032
|
| Accrual TDRs, Deferral of Principal |
0
|
0
|
306
|
| Accrual TDRs, Deferral of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
1,228
|
1,227
|
0
|
| Accrual TDRs, Extension of Maturity |
|
0
|
0
|
| Accrual TDRs |
1,228
|
1,227
|
306
|
| Real estate loans [Member] | Hotel/motel [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
1,292
|
1,216
|
1,115
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
3,722
|
28
|
(53)
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
0
|
0
|
| Non-Accrual TDRs, Total |
5,014
|
1,244
|
1,062
|
| Accrual TDRs, Deferral of Principal |
0
|
414
|
1,807
|
| 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
|
| Accrual TDRs |
0
|
414
|
1,807
|
| Real estate loans [Member] | Gas station [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
0
|
959
|
1,075
|
| 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
|
959
|
1,075
|
| Accrual TDRs, Deferral of Principal |
1,324
|
0
|
2,335
|
| Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
|
0
|
0
|
| Accrual TDRs |
1,324
|
0
|
2,335
|
| Real estate loans [Member] | Other [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
387
|
0
|
943
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
651
|
1,301
|
1,498
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
143
|
216
|
433
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
8
|
24
|
| Non-Accrual TDRs, Total |
1,181
|
1,525
|
2,898
|
| Accrual TDRs, Deferral of Principal |
2,688
|
3,537
|
2,343
|
| Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
286
|
322
|
782
|
| Accrual TDRs, Extension of Maturity |
1,344
|
1,378
|
1,372
|
| Accrual TDRs |
4,318
|
5,237
|
4,497
|
| Real estate loans [Member] | Residential property [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
0
|
689
|
742
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
|
0
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
|
0
|
0
|
| Non-Accrual TDRs, Total |
0
|
689
|
742
|
| Accrual TDRs, Deferral of Principal |
783
|
0
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
289
|
299
|
308
|
| Accrual TDRs |
1,072
|
299
|
308
|
| Commercial and industrial loans [Member] | Commercial term [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
149
|
45
|
14
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
71
|
0
|
(1)
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
69
|
997
|
2,556
|
| Non-Accrual TDRs, Extension of Maturity |
419
|
679
|
1,481
|
| Non-Accrual TDRs, Total |
708
|
1,721
|
4,050
|
| Accrual TDRs, Deferral of Principal |
22
|
40
|
57
|
| Accrual TDRs, Deferral of Principal and Interest |
198
|
214
|
226
|
| Accrual TDRs, Reduction of Principal and Interest |
2,135
|
1,673
|
567
|
| Accrual TDRs, Extension of Maturity |
662
|
945
|
1,358
|
| Accrual TDRs |
3,017
|
2,872
|
2,208
|
| Commercial and industrial loans [Member] | Commercial lines of credit [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
0
|
222
|
227
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
0
|
126
|
| Non-Accrual TDRs, Extension of Maturity |
0
|
58
|
113
|
| Non-Accrual TDRs, Total |
0
|
280
|
466
|
| Accrual TDRs, Deferral of Principal |
0
|
0
|
2,156
|
| Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
68
|
0
|
0
|
| Accrual TDRs |
68
|
0
|
2,156
|
| Commercial and industrial loans [Member] | International loans [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
|
|
0
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
|
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
|
|
0
|
| Non-Accrual TDRs, Extension of Maturity |
|
|
0
|
| Non-Accrual TDRs, Total |
|
|
0
|
| Accrual TDRs, Deferral of Principal |
|
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
|
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
|
|
200
|
| Accrual TDRs, Extension of Maturity |
|
|
0
|
| Accrual TDRs |
|
|
200
|
| Consumer loans [Member] |
|
|
|
| Financing Receivable, Modifications [Line Items] |
|
|
|
| Non-Accrual TDRs, Deferral of Principal |
|
0
|
0
|
| Non-Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Non-Accrual TDRs, Reduction of Principal and Interest |
0
|
116
|
131
|
| Non-Accrual TDRs, Extension of Maturity |
|
0
|
0
|
| Non-Accrual TDRs, Total |
0
|
116
|
131
|
| Accrual TDRs, Deferral of Principal |
0
|
250
|
0
|
| Accrual TDRs, Deferral of Principal and Interest |
|
0
|
0
|
| Accrual TDRs, Reduction of Principal and Interest |
119
|
0
|
0
|
| Accrual TDRs, Extension of Maturity |
|
0
|
0
|
| Accrual TDRs |
$ 119
|
$ 250
|
$ 0
|