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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 |

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