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Credit Quality - Schedule of Troubled Debt Restructurings, Segregated by Class of Loans (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Contract
Jun. 30, 2019
USD ($)
Contract
Jun. 30, 2020
USD ($)
Contract
Jun. 30, 2019
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 69 7 79 9
Pre-Modification Outstanding Recorded Investment $ 22,576 $ 4,796 $ 33,070 $ 5,474
Post-Modification Outstanding Recorded Investment $ 22,389 $ 4,743 $ 32,393 $ 5,397
Construction & Land Development [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 9 3 12 3
Pre-Modification Outstanding Recorded Investment $ 2,562 $ 2,242 $ 4,607 $ 2,242
Post-Modification Outstanding Recorded Investment $ 2,557 $ 2,202 $ 4,570 $ 2,202
Commercial Real Estate [Member] | Owner-Occupied [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 18 1 21 1
Pre-Modification Outstanding Recorded Investment $ 10,628 $ 150 $ 18,579 $ 150
Post-Modification Outstanding Recorded Investment $ 10,586 $ 150 $ 18,345 $ 150
Commercial Real Estate [Member] | Nonowner-Occupied [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 6 0 6 0
Pre-Modification Outstanding Recorded Investment $ 2,259 $ 0 $ 2,259 $ 0
Post-Modification Outstanding Recorded Investment $ 2,248 $ 0 $ 2,248 $ 0
Other Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 14 1 18 2
Pre-Modification Outstanding Recorded Investment $ 3,169 $ 559 $ 3,667 $ 824
Post-Modification Outstanding Recorded Investment $ 3,090 $ 559 $ 3,322 $ 811
Residential Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 19 2 19 3
Pre-Modification Outstanding Recorded Investment $ 3,889 $ 1,845 $ 3,889 $ 2,258
Post-Modification Outstanding Recorded Investment $ 3,872 $ 1,832 $ 3,872 $ 2,234
Consumer [Member] | Bankcard [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 0 0 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0
Consumer [Member] | Other Consumer [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 3 0 3 0
Pre-Modification Outstanding Recorded Investment $ 69 $ 0 $ 69 $ 0
Post-Modification Outstanding Recorded Investment $ 36 $ 0 $ 36 $ 0