Quarterly report pursuant to Section 13 or 15(d)

Loans - Troubled Debt Restructurings (Detail)

v3.20.2
Loans - Troubled Debt Restructurings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Nonaccrual TDRs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 17,963 $ 55,478
Nonaccrual TDRs | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 16,893 41,798
Nonaccrual TDRs | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 423 12,991
Nonaccrual TDRs | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 647 689
Nonaccrual TDRs | Deferral of Principal    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 647 689
Nonaccrual TDRs | Deferral of Principal | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 647 689
Nonaccrual TDRs | Deferral of Principal and Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 3,558 285
Nonaccrual TDRs | Deferral of Principal and Interest | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 3,382 132
Nonaccrual TDRs | Deferral of Principal and Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 176 153
Nonaccrual TDRs | Reduction of Principal and Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 13,758 40,266
Nonaccrual TDRs | Reduction of Principal and Interest | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 13,511 27,740
Nonaccrual TDRs | Reduction of Principal and Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 247 12,527
Nonaccrual TDRs | Extension of Maturity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   14,238
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
Accrual TDRs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 7,957 830
Accrual TDRs | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 7,290  
Accrual TDRs | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 77 222
Accrual TDRs | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 590 608
Accrual TDRs | Deferral of Principal    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 521 531
Accrual TDRs | Deferral of Principal | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 521 531
Accrual TDRs | Deferral of Principal and Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   36
Accrual TDRs | Deferral of Principal and Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   36
Accrual TDRs | Reduction of Principal and Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 76 148
Accrual TDRs | Reduction of Principal and Interest | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 7 71
Accrual TDRs | Reduction of Principal and Interest | Consumer    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 69 77
Accrual TDRs | Extension of Maturity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 7,360 114
Accrual TDRs | Extension of Maturity | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 7,290  
Accrual TDRs | Extension of Maturity | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 70 $ 114