Quarterly report pursuant to Section 13 or 15(d)

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

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Loans - Information on Impaired Loans, Disaggregated by Loan Class (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 32,736 $ 35,859
Unpaid Principal Balance 35,663 39,363
With No Related Allowance Recorded 21,526 23,985
With an Allowance Recorded 11,210 11,874
Impaired Financing Receivable, Related Allowance 4,093 4,445
Impaired Financing Receivable Average Recorded Value Of Investment 32,912 41,841
Interest Income Recognized 689 2,683
Real estate loans [Member] | Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 2,838 2,597
Unpaid Principal Balance 3,133 2,892
With No Related Allowance Recorded 2,683 2,435
With an Allowance Recorded 155 162
Impaired Financing Receivable, Related Allowance 59 27
Impaired Financing Receivable Average Recorded Value Of Investment 2,872 3,878
Interest Income Recognized 41 277
Real estate loans [Member] | Hospitality [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 6,666 7,168
Unpaid Principal Balance 7,082 7,538
With No Related Allowance Recorded 3,264 2,873
With an Allowance Recorded 3,402 4,295
Impaired Financing Receivable, Related Allowance 2,582 3,068
Impaired Financing Receivable Average Recorded Value Of Investment 6,703 6,628
Interest Income Recognized 154 572
Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 5,063 5,393
Unpaid Principal Balance 5,567 5,815
With No Related Allowance Recorded 4,099 4,400
With an Allowance Recorded 965 993
Impaired Financing Receivable, Related Allowance 84 112
Impaired Financing Receivable Average Recorded Value Of Investment 5,107 7,116
Interest Income Recognized 162 436
Real estate loans [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 8,187 9,288
Unpaid Principal Balance 9,334 10,810
With No Related Allowance Recorded 6,142 7,219
With an Allowance Recorded 2,045 2,069
Impaired Financing Receivable, Related Allowance 605 647
Impaired Financing Receivable Average Recorded Value Of Investment 8,249 10,218
Interest Income Recognized 212 795
Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 2,841 2,895
Unpaid Principal Balance 2,886 3,081
With No Related Allowance Recorded 2,554 2,608
With an Allowance Recorded 287 287
Impaired Financing Receivable, Related Allowance 4 4
Impaired Financing Receivable Average Recorded Value Of Investment 2,770 2,839
Interest Income Recognized 30 120
Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 5,144 5,257
Unpaid Principal Balance 5,510 5,621
With No Related Allowance Recorded 1,550 1,858
With an Allowance Recorded 3,593 3,399
Impaired Financing Receivable, Related Allowance 726 457
Impaired Financing Receivable Average Recorded Value Of Investment 5,213 6,637
Interest Income Recognized 77 368
Commercial and industrial loans [Member] | Commercial lines of credit [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 38 381
Unpaid Principal Balance 135 493
With No Related Allowance Recorded 38 280
With an Allowance Recorded 0 101
Impaired Financing Receivable, Related Allowance 0 100
Impaired Financing Receivable Average Recorded Value Of Investment 45 1,515
Interest Income Recognized 5 42
Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,259 1,215
Unpaid Principal Balance 1,259 1,215
With No Related Allowance Recorded 496 647
With an Allowance Recorded 763 568
Impaired Financing Receivable, Related Allowance 33 30
Impaired Financing Receivable Average Recorded Value Of Investment 1,260 1,257
Interest Income Recognized 0 0
Consumer loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 700 1,665
Unpaid Principal Balance 757 1,898
With No Related Allowance Recorded 700 1,665
With an Allowance Recorded 0 0
Impaired Financing Receivable, Related Allowance 0 0
Impaired Financing Receivable Average Recorded Value Of Investment 693 1,753
Interest Income Recognized $ 8 $ 73