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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 54,328 | $ 50,032
Recorded Investment with Allowance | 49,974 | 38,257
Related Allowance | 5,374 | 3,861
Average Recorded Investment | 41,637 | 47,117
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 12,817 | 7,126
Recorded Investment with Allowance | 12,566 | 6,933
Related Allowance | 450 | 202
Average Recorded Investment | 9,352 | 7,739
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 3,873 | 949
Recorded Investment with Allowance | 3,593 | 757
Related Allowance | 279 | 50
Average Recorded Investment | 2,501 | 6,057
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 3,060 | 1,789
Recorded Investment with Allowance | 2,768 | 1,545
Related Allowance | 254 | 127
Average Recorded Investment | 2,422 | 1,650
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 7,752 | 7,177
Recorded Investment with Allowance | 7,483 | 6,862
Related Allowance | 3,264 | 2,433
Average Recorded Investment | 6,801 | 7,154
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 11,853 | 18,507
Recorded Investment with Allowance | 11,237 | 10,977
Related Allowance | 923 | 881
Average Recorded Investment | 11,131 | 12,140
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 959 | 928
Recorded Investment with Allowance | 826 | 829
Related Allowance | 108 | 131
Average Recorded Investment | 718 | 846
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 4,917 | 710
Recorded Investment with Allowance | 4,708 | 490
Related Allowance | 94 | 35
Average Recorded Investment | 424 | 481
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 6,108 | 12,846
Recorded Investment with Allowance | 4,603 | 9,864
Related Allowance | 2 | 2
Average Recorded Investment | 7,199 | $ 11,050
Pegasus Bank [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,989 |
Recorded Investment with Allowance | 2,190 |
Average Recorded Investment | $ 1,089 |

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