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, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 27,183 $ 26,350 $ 35,859
Unpaid Principal Balance 29,623 27,986 39,363
With No Related Allowance Recorded 14,225 15,019 23,985
With an Allowance Recorded 12,958 11,331 11,874
Related Allowance 5,878 4,327 4,445
Average Recorded Investment 29,590 27,518 41,841
Interest Income Recognized 1,789 2,383 2,683
Real estate loans [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 18,663 21,757 27,341
Unpaid Principal Balance 20,701 23,258 30,136
With No Related Allowance Recorded 11,783 13,303 19,535
With an Allowance Recorded 6,880 8,454 7,806
Related Allowance 2,093 3,980 3,858
Average Recorded Investment 19,930 21,721 30,679
Interest Income Recognized 1,501 2,033 2,200
Real estate loans [Member] | Retail [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 1,403 1,678 2,597
Unpaid Principal Balance 1,423 1,684 2,892
With No Related Allowance Recorded 1,246 151 2,435
With an Allowance Recorded 157 1,527 162
Related Allowance 1 120 27
Average Recorded Investment 1,528 2,243 3,878
Interest Income Recognized 106 141 277
Real estate loans [Member] | Hotel/motel [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 6,184 6,227 7,168
Unpaid Principal Balance 7,220 6,823 7,538
With No Related Allowance Recorded 2,144 2,243 2,873
With an Allowance Recorded 4,040 3,984 4,295
Related Allowance 1,677 3,078 3,068
Average Recorded Investment 6,080 4,887 6,628
Interest Income Recognized 431 454 572
Real estate loans [Member] | Other [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 8,513 11,054 14,681
Unpaid Principal Balance 9,330 11,900 16,625
With No Related Allowance Recorded 7,569 8,111 11,619
With an Allowance Recorded 944 2,943 3,062
Related Allowance 394 782 759
Average Recorded Investment 9,551 11,935 17,334
Interest Income Recognized 842 1,326 1,231
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 2,563 2,798 2,895
Unpaid Principal Balance 2,728 2,851 3,081
With No Related Allowance Recorded 824 2,798 2,608
With an Allowance Recorded 1,739 0 287
Related Allowance 21 0 4
Average Recorded Investment 2,771 2,656 2,839
Interest Income Recognized 122 112 120
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 2,857 4,106 5,257
Unpaid Principal Balance 2,899 4,171 5,621
With No Related Allowance Recorded 886 1,229 1,858
With an Allowance Recorded 1,971 2,877 3,399
Related Allowance 441 347 457
Average Recorded Investment 3,529 4,815 6,637
Interest Income Recognized 192 307 368
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 182 68 381
Unpaid Principal Balance 182 68 493
With No Related Allowance Recorded 182 68 280
With an Allowance Recorded 0 0 101
Related Allowance 0 0 100
Average Recorded Investment 685 45 1,515
Interest Income Recognized 16 14 42
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 0 0 1,215
Unpaid Principal Balance 0 0 1,215
With No Related Allowance Recorded 0 0 647
With an Allowance Recorded 0 0 568
Related Allowance 0 0 30
Average Recorded Investment 0 315 1,257
Interest Income Recognized 0 0 0
Leases Receivable [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 4,452    
Unpaid Principal Balance 4,626    
With No Related Allowance Recorded 455    
With an Allowance Recorded 3,997    
Related Allowance 3,334    
Average Recorded Investment 4,464    
Interest Income Recognized 47    
Consumer loans [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 1,029 419 1,665
Unpaid Principal Balance 1,215 489 1,898
With No Related Allowance Recorded 919 419 1,665
With an Allowance Recorded 110 0 0
Related Allowance 10 0 0
Average Recorded Investment 982 622 1,753
Interest Income Recognized $ 33 $ 29 $ 73