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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 39,919 $ 36,125
Recorded Investment With Related Allowance 72,567 78,694
Total Recorded Investment 112,485 114,819
Unpaid Contractual Principal Balance 120,182 123,559
Related Allowance 9,843 10,531
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 2,755 3,609
Recorded Investment With Related Allowance 27,306 27,031
Total Recorded Investment 30,061 30,640
Unpaid Contractual Principal Balance 34,157 35,957
Related Allowance 5,688 5,864
Commercial real estate loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 26,411 22,936
Recorded Investment With Related Allowance 33,673 39,353
Total Recorded Investment 60,083 62,289
Unpaid Contractual Principal Balance 62,277 64,264
Related Allowance 3,376 3,872
Commercial real estate loans | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 25,713 21,318
Recorded Investment With Related Allowance 31,594 36,974
Total Recorded Investment 57,306 58,292
Unpaid Contractual Principal Balance 59,501 60,267
Related Allowance 3,156 3,612
Commercial real estate loans | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 698 1,618
Recorded Investment With Related Allowance 2,079 2,379
Total Recorded Investment 2,777 3,997
Unpaid Contractual Principal Balance 2,776 3,997
Related Allowance 220 260
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 9,431 8,398
Recorded Investment With Related Allowance 9,126 9,958
Total Recorded Investment 18,557 18,356
Unpaid Contractual Principal Balance 19,872 19,712
Related Allowance 686 725
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,322 1,182
Recorded Investment With Related Allowance 2,462 2,352
Total Recorded Investment 3,784 3,534
Unpaid Contractual Principal Balance 3,876 3,626
Related Allowance 93 70
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,322 1,182
Recorded Investment With Related Allowance 2,462 2,352
Total Recorded Investment 3,784 3,534
Unpaid Contractual Principal Balance 3,876 3,626
Related Allowance $ 93 $ 70