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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 45,352 $ 49,309
Recorded Investment With Related Allowance 117,181 114,857
Total Recorded Investment 162,533 164,166
Unpaid Contractual Principal Balance 173,398 175,198
Related Allowance 25,101 14,561
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 10,676 9,946
Recorded Investment With Related Allowance 78,992 75,553
Total Recorded Investment 89,668 85,499
Unpaid Contractual Principal Balance 94,333 90,269
Related Allowance 21,664 11,044
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 27,360 30,613
Recorded Investment With Related Allowance 29,587 30,238
Total Recorded Investment 56,947 60,851
Unpaid Contractual Principal Balance 60,893 64,680
Related Allowance 2,672 2,735
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 25,856 28,709
Recorded Investment With Related Allowance 29,122 29,771
Total Recorded Investment 54,978 58,480
Unpaid Contractual Principal Balance 58,901 62,286
Related Allowance 2,656 2,718
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,504 1,904
Recorded Investment With Related Allowance 465 467
Total Recorded Investment 1,969 2,371
Unpaid Contractual Principal Balance 1,992 2,394
Related Allowance 16 17
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,033 5,654
Recorded Investment With Related Allowance 7,997 8,402
Total Recorded Investment 14,030 14,056
Unpaid Contractual Principal Balance 15,168 15,332
Related Allowance 705 718
Consumer loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,283 3,096
Recorded Investment With Related Allowance 605 664
Total Recorded Investment 1,888 3,760
Unpaid Contractual Principal Balance 3,004 4,917
Related Allowance 60 64
Consumer loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,283 3,096
Recorded Investment With Related Allowance 605 664
Total Recorded Investment 1,888 3,760
Unpaid Contractual Principal Balance 3,004 4,917
Related Allowance $ 60 $ 64