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Loans and Allowance for Loan Losses - Summary of Amounts Included in Nonaccrual Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | $ 19,995 | $ 22,603
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 2,082 | 838
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 1,718 | 187
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 1,291 | 954
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 6,142 | 5,488
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 3,171 | 5,682
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 412 | 437
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 368 | 490
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | 3,932 | $ 8,527
Pegasus Bank [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual Loans, Total | $ 879 |

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