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Loans Held for Investment and Allowance for Credit Losses on Loans - Impaired Loans Segregated by Class of Loans (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance $ 55,447
Recorded Investment with Allowance 48,898
Related Allowance 3,211
Average Recorded Investment 46,041
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 13,253
Recorded Investment with Allowance 13,000
Related Allowance 514
Average Recorded Investment 12,868
Real Estate [Member] | Non-residential Real Estate Other [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 3,973
Recorded Investment with Allowance 3,678
Related Allowance 300
Average Recorded Investment 3,946
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 3,445
Recorded Investment with Allowance 3,129
Related Allowance 242
Average Recorded Investment 2,968
Real Estate [Member] | Residential Real Estate Other [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 7,117
Recorded Investment with Allowance 4,487
Related Allowance 946
Average Recorded Investment 5,567
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 11,598
Recorded Investment with Allowance 11,012
Related Allowance 1,005
Average Recorded Investment 11,085
Consumer Other [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 969
Recorded Investment with Allowance 836
Related Allowance 97
Average Recorded Investment 844
Other Loans [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 5,711
Recorded Investment with Allowance 5,510
Related Allowance 105
Average Recorded Investment 1,130
Acquired Loans [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Unpaid Principal Balance 6,421
Recorded Investment with Allowance 5,108
Related Allowance 2
Average Recorded Investment 5,472
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