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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 49,309 $ 36,125
Recorded Investment With Related Allowance 114,857 78,694
Total Recorded Investment 164,166 114,819
Unpaid Contractual Principal Balance 175,198 123,559
Related Allowance 14,561 10,531
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 9,946 3,609
Recorded Investment With Related Allowance 75,553 27,031
Total Recorded Investment 85,499 30,640
Unpaid Contractual Principal Balance 90,269 35,957
Related Allowance 11,044 5,864
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 30,613 22,936
Recorded Investment With Related Allowance 30,238 39,353
Total Recorded Investment 60,851 62,289
Unpaid Contractual Principal Balance 64,680 64,264
Related Allowance 2,735 3,872
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 28,709 21,318
Recorded Investment With Related Allowance 29,771 36,974
Total Recorded Investment 58,480 58,292
Unpaid Contractual Principal Balance 62,286 60,267
Related Allowance 2,718 3,612
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,904 1,618
Recorded Investment With Related Allowance 467 2,379
Total Recorded Investment 2,371 3,997
Unpaid Contractual Principal Balance 2,394 3,997
Related Allowance 17 260
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 5,654 8,398
Recorded Investment With Related Allowance 8,402 9,958
Total Recorded Investment 14,056 18,356
Unpaid Contractual Principal Balance 15,332 19,712
Related Allowance 718 725
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,096 1,182
Recorded Investment With Related Allowance 664 2,352
Total Recorded Investment 3,760 3,534
Unpaid Contractual Principal Balance 4,917 3,626
Related Allowance 64 70
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,096 1,182
Recorded Investment With Related Allowance 664 2,352
Total Recorded Investment 3,760 3,534
Unpaid Contractual Principal Balance 4,917 3,626
Related Allowance $ 64 $ 70