Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Information on Impaired Loans, Disaggregated by Loan Class (Detail)

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Loans and Leases - Information on Impaired Loans, Disaggregated by Loan Class (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 26,350 $ 35,859 $ 45,865
Unpaid Principal Balance 27,986 39,363 49,586
With No Related Allowance Recorded 15,019 23,985 34,897
With an Allowance Recorded 11,331 11,874 10,968
Related Allowance 4,327 4,445 5,246
Average Recorded Investment 27,518 41,841 48,790
Interest Income Recognized 2,383 2,683 3,160
Real estate loans [Member] | Retail [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 1,678 2,597 4,436
Unpaid Principal Balance 1,684 2,892 4,546
With No Related Allowance Recorded 151 2,435 1,938
With an Allowance Recorded 1,527 162 2,498
Related Allowance 120 27 220
Average Recorded Investment 2,243 3,878 5,373
Interest Income Recognized 141 277 251
Real estate loans [Member] | Hotel/motel [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 6,227 7,168 5,835
Unpaid Principal Balance 6,823 7,538 6,426
With No Related Allowance Recorded 2,243 2,873 4,581
With an Allowance Recorded 3,984 4,295 1,254
Related Allowance 3,078 3,068 1,828
Average Recorded Investment 4,887 6,628 4,583
Interest Income Recognized 454 572 398
Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 4,984 5,393 8,974
Unpaid Principal Balance 5,092 5,815 9,594
With No Related Allowance Recorded 4,984 4,400 8,526
With an Allowance Recorded 0 993 448
Related Allowance 0 112 150
Average Recorded Investment 4,831 7,116 11,281
Interest Income Recognized 645 436 787
Real estate loans [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 6,070 9,288 10,125
Unpaid Principal Balance 6,808 10,810 11,591
With No Related Allowance Recorded 3,127 7,219 8,890
With an Allowance Recorded 2,943 2,069 1,235
Related Allowance 782 647 319
Average Recorded Investment 7,104 10,218 10,579
Interest Income Recognized 681 795 885
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 2,798 2,895 3,127
Unpaid Principal Balance 2,851 3,081 3,268
With No Related Allowance Recorded 2,798 2,608 3,127
With an Allowance Recorded 0 287 0
Related Allowance 0 4 0
Average Recorded Investment 2,656 2,839 2,924
Interest Income Recognized 112 120 115
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 4,106 5,257 7,614
Unpaid Principal Balance 4,171 5,621 8,133
With No Related Allowance Recorded 1,229 1,858 2,999
With an Allowance Recorded 2,877 3,399 4,615
Related Allowance 347 457 2,443
Average Recorded Investment 4,815 6,637 9,458
Interest Income Recognized 307 368 566
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 68 381 466
Unpaid Principal Balance 68 493 575
With No Related Allowance Recorded 68 280 466
With an Allowance Recorded 0 101 0
Related Allowance 0 100 0
Average Recorded Investment 45 1,515 1,205
Interest Income Recognized 14 42 66
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 0 1,215 3,546
Unpaid Principal Balance 0 1,215 3,546
With No Related Allowance Recorded 0 647 2,628
With an Allowance Recorded 0 568 918
Related Allowance 0 30 286
Average Recorded Investment 315 1,257 1,736
Interest Income Recognized 0 0 33
Consumer loans [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 419 1,665 1,742
Unpaid Principal Balance 489 1,898 1,907
With No Related Allowance Recorded 419 1,665 1,742
With an Allowance Recorded 0 0 0
Related Allowance 0 0 0
Average Recorded Investment 622 1,753 1,651
Interest Income Recognized $ 29 $ 73 $ 59