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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

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