Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail)

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Loans and Leases - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Nonaccrual TDRs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 55,478 $ 4,276
Nonaccrual TDRs | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 41,798 2,059
Nonaccrual TDRs | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 12,991 1,471
Nonaccrual TDRs | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 689 746
Nonaccrual TDRs | Deferral of Principal    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 689 1,473
Nonaccrual TDRs | Deferral of Principal | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   462
Nonaccrual TDRs | Deferral of Principal | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   265
Nonaccrual TDRs | Deferral of Principal | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 689 746
Nonaccrual TDRs | Deferral of Principal and/or Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 285 1,530
Nonaccrual TDRs | Deferral of Principal and/or Interest | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 132 1,423
Nonaccrual TDRs | Deferral of Principal and/or Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 153 107
Nonaccrual TDRs | Reduction of Principal and/or Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 40,266 843
Nonaccrual TDRs | Reduction of Principal and/or Interest | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 27,740 174
Nonaccrual TDRs | Reduction of Principal and/or Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 12,527 669
Nonaccrual TDRs | Extension of Maturity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 14,238 430
Nonaccrual TDRs | Extension of Maturity | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 13,926  
Nonaccrual TDRs | Extension of Maturity | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 312 430
Accrual TDRs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 830 6,029
Accrual TDRs | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   5,234
Accrual TDRs | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 222 702
Accrual TDRs | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 608 93
Accrual TDRs | Deferral of Principal    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 531 3,345
Accrual TDRs | Deferral of Principal | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   3,345
Accrual TDRs | Deferral of Principal | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 531  
Accrual TDRs | Deferral of Principal and/or Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 36 166
Accrual TDRs | Deferral of Principal and/or Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 36 166
Accrual TDRs | Reduction of Principal and/or Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 148 1,627
Accrual TDRs | Reduction of Principal and/or Interest | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   1,148
Accrual TDRs | Reduction of Principal and/or Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 71 386
Accrual TDRs | Reduction of Principal and/or Interest | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 77 93
Accrual TDRs | Extension of Maturity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 114 891
Accrual TDRs | Extension of Maturity | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   741
Accrual TDRs | Extension of Maturity | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 114 $ 150