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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 47,219 $ 33,825
Recorded Investment With Related Allowance 116,425 122,800
Total Recorded Investment 163,644 156,625
Unpaid Contractual Principal Balance 179,243 165,918
Related Allowance 38,576 33,025
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 14,617 8,339
Recorded Investment With Related Allowance 86,243 89,513
Total Recorded Investment 100,860 97,852
Unpaid Contractual Principal Balance 114,875 104,007
Related Allowance 36,662 29,684
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 26,400 17,535
Recorded Investment With Related Allowance 24,842 26,063
Total Recorded Investment 51,242 43,598
Unpaid Contractual Principal Balance 51,612 45,597
Related Allowance 1,338 2,628
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 26,046 16,732
Recorded Investment With Related Allowance 24,842 25,606
Total Recorded Investment 50,888 42,338
Unpaid Contractual Principal Balance 51,258 44,337
Related Allowance 1,338 2,615
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 354 803
Recorded Investment With Related Allowance 0 457
Total Recorded Investment 354 1,260
Unpaid Contractual Principal Balance 354 1,260
Related Allowance 0 13
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 5,836 7,826
Recorded Investment With Related Allowance 4,853 6,078
Total Recorded Investment 10,689 13,904
Unpaid Contractual Principal Balance 11,800 14,948
Related Allowance 518 600
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 366 125
Recorded Investment With Related Allowance 487 1,146
Total Recorded Investment 853 1,271
Unpaid Contractual Principal Balance 956 1,366
Related Allowance 58 113
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 366 125
Recorded Investment With Related Allowance 487 1,146
Total Recorded Investment 853 1,271
Unpaid Contractual Principal Balance 956 1,366
Related Allowance $ 58 $ 113