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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 55,447 $ 50,032
Recorded Investment with Allowance 48,898 38,257
Related Allowance 3,211 3,861
Average Recorded Investment 46,041 47,117
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 13,253 7,126
Recorded Investment with Allowance 13,000 6,933
Related Allowance 514 202
Average Recorded Investment 12,868 7,739
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 3,973 949
Recorded Investment with Allowance 3,678 757
Related Allowance 300 50
Average Recorded Investment 3,946 6,057
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 3,445 1,789
Recorded Investment with Allowance 3,129 1,545
Related Allowance 242 127
Average Recorded Investment 2,968 1,650
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,117 7,177
Recorded Investment with Allowance 4,487 6,862
Related Allowance 946 2,433
Average Recorded Investment 5,567 7,154
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 11,598 18,507
Recorded Investment with Allowance 11,012 10,977
Related Allowance 1,005 881
Average Recorded Investment 11,085 12,140
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 969 928
Recorded Investment with Allowance 836 829
Related Allowance 97 131
Average Recorded Investment 844 846
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,711 710
Recorded Investment with Allowance 5,510 490
Related Allowance 105 35
Average Recorded Investment 1,130 481
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,421 12,846
Recorded Investment with Allowance 5,108 9,864
Related Allowance 2 2
Average Recorded Investment 5,472 $ 11,050
Pegasus Bank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,960  
Recorded Investment with Allowance 2,138  
Average Recorded Investment $ 2,161