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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 33,825 $ 49,309
Recorded Investment With Related Allowance 122,800 114,857
Total Recorded Investment 156,625 164,166
Unpaid Contractual Principal Balance 165,918 175,198
Related Allowance 33,025 14,561
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 8,339 9,946
Recorded Investment With Related Allowance 89,513 75,553
Total Recorded Investment 97,852 85,499
Unpaid Contractual Principal Balance 104,007 90,269
Related Allowance 29,684 11,044
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 17,535 30,613
Recorded Investment With Related Allowance 26,063 30,238
Total Recorded Investment 43,598 60,851
Unpaid Contractual Principal Balance 45,597 64,680
Related Allowance 2,628 2,735
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 16,732 28,709
Recorded Investment With Related Allowance 25,606 29,771
Total Recorded Investment 42,338 58,480
Unpaid Contractual Principal Balance 44,337 62,286
Related Allowance 2,615 2,718
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 803 1,904
Recorded Investment With Related Allowance 457 467
Total Recorded Investment 1,260 2,371
Unpaid Contractual Principal Balance 1,260 2,394
Related Allowance 13 17
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,826 5,654
Recorded Investment With Related Allowance 6,078 8,402
Total Recorded Investment 13,904 14,056
Unpaid Contractual Principal Balance 14,948 15,332
Related Allowance 600 718
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 125 3,096
Recorded Investment With Related Allowance 1,146 664
Total Recorded Investment 1,271 3,760
Unpaid Contractual Principal Balance 1,366 4,917
Related Allowance 113 64
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 125 3,096
Recorded Investment With Related Allowance 1,146 664
Total Recorded Investment 1,271 3,760
Unpaid Contractual Principal Balance 1,366 4,917
Related Allowance $ 113 $ 64