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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 48,176 | $ 50,032
Recorded Investment with Allowance | 37,069 | 38,257
Related Allowance | 4,792 | 3,861
Average Recorded Investment | 38,590 | 47,117
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 8,051 | 7,126
Recorded Investment with Allowance | 7,933 | 6,933
Related Allowance | 239 | 202
Average Recorded Investment | 7,662 | 7,739
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,687 | 949
Recorded Investment with Allowance | 1,422 | 757
Related Allowance | 190 | 50
Average Recorded Investment | 1,615 | 6,057
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,427 | 1,789
Recorded Investment with Allowance | 2,151 | 1,545
Related Allowance | 183 | 127
Average Recorded Investment | 1,964 | 1,650
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 6,629 | 7,177
Recorded Investment with Allowance | 6,350 | 6,862
Related Allowance | 3,081 | 2,433
Average Recorded Investment | 6,529 | 7,154
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 18,389 | 18,507
Recorded Investment with Allowance | 10,842 | 10,977
Related Allowance | 931 | 881
Average Recorded Investment | 10,944 | 12,140
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 781 | 928
Recorded Investment with Allowance | 672 | 829
Related Allowance | 149 | 131
Average Recorded Investment | 691 | 846
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 659 | 710
Recorded Investment with Allowance | 455 | 490
Related Allowance | 17 | 35
Average Recorded Investment | 322 | 481
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 9,553 | 12,846
Recorded Investment with Allowance | 7,244 | 9,864
Related Allowance | 2 | 2
Average Recorded Investment | $ 8,863 | $ 11,050

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