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Loans and Leases - Schedule of Subsequently Defaulted TDRs (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
SecurityLoan
Mar. 31, 2019
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable    
Threshold period for loans in default (in days) 30 days  
TDRs | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 51 116
Pre-modification Outstanding Recorded Investment $ 10,790 $ 34,120
Post-modification Outstanding Recorded Investment $ 9,795 $ 31,429
Number of loans | SecurityLoan 108 70
Recorded investment $ 27,846 $ 10,597
TDRs | Commercial Loans | Real estate - construction | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 1 1
Pre-modification Outstanding Recorded Investment $ 154 $ 39
Post-modification Outstanding Recorded Investment $ 86 $ 39
Number of loans | SecurityLoan 1 1
Recorded investment $ 9,212 $ 939
TDRs | Commercial Loans | Real estate - owner-occupied | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 4 4
Pre-modification Outstanding Recorded Investment $ 2,520 $ 6,904
Post-modification Outstanding Recorded Investment $ 2,558 $ 4,661
Number of loans | SecurityLoan 5 3
Recorded investment $ 1,898 $ 640
TDRs | Commercial Loans | Real estate - non-owner-occupied | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 5 7
Pre-modification Outstanding Recorded Investment $ 3,944 $ 2,990
Post-modification Outstanding Recorded Investment $ 3,820 $ 2,968
Number of loans | SecurityLoan 11 7
Recorded investment $ 5,287 $ 825
TDRs | Commercial Loans | Commercial and industrial | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 14 23
Pre-modification Outstanding Recorded Investment $ 1,844 $ 17,382
Post-modification Outstanding Recorded Investment $ 1,367 $ 17,040
Number of loans | SecurityLoan 33 10
Recorded investment $ 7,862 $ 3,933
TDRs | Residential mortgage | Residential mortgage | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 6 10
Pre-modification Outstanding Recorded Investment $ 750 $ 1,741
Post-modification Outstanding Recorded Investment $ 413 $ 1,738
Number of loans | SecurityLoan 15 13
Recorded investment $ 1,190 $ 1,108
TDRs | Consumer and other loans | Consumer - Home equity | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 16 33
Pre-modification Outstanding Recorded Investment $ 1,507 $ 4,277
Post-modification Outstanding Recorded Investment $ 1,482 $ 4,233
Number of loans | SecurityLoan 23 16
Recorded investment $ 2,189 $ 2,891
TDRs | Consumer and other loans | Consumer - Other | TDRs Occurring during the Period    
Accounts, Notes, Loans and Financing Receivable    
Number of Loans | SecurityLoan 5 38
Pre-modification Outstanding Recorded Investment $ 71 $ 787
Post-modification Outstanding Recorded Investment $ 69 $ 750
Number of loans | SecurityLoan 20 20
Recorded investment $ 208 $ 261