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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, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 50,032 | $ 49,391
Recorded Investment with Allowance | 38,257 | 39,688
Related Allowance | 3,861 | 5,647
Average Recorded Investment | 47,117 | 35,181
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 7,126 | 2,011
Recorded Investment with Allowance | 6,933 | 1,945
Related Allowance | 202 | 141
Average Recorded Investment | 7,739 | 1,858
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 949 | 10,323
Recorded Investment with Allowance | 757 | 10,240
Related Allowance | 50 | 496
Average Recorded Investment | 6,057 | 3,975
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,789 | 1,745
Recorded Investment with Allowance | 1,545 | 1,542
Related Allowance | 127 | 146
Average Recorded Investment | 1,650 | 1,440
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 7,177 | 5,837
Recorded Investment with Allowance | 6,862 | 5,549
Related Allowance | 2,433 | 2,135
Average Recorded Investment | 7,154 | 5,258
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 18,507 | 18,101
Recorded Investment with Allowance | 10,977 | 11,158
Related Allowance | 881 | 2,412
Average Recorded Investment | 12,140 | 11,131
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 928 | 545
Recorded Investment with Allowance | 829 | 514
Related Allowance | 131 | 127
Average Recorded Investment | 846 | 541
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 710 | 6,092
Recorded Investment with Allowance | 490 | 5,595
Related Allowance | 35 | 178
Average Recorded Investment | 481 | 7,439
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 12,846 | 4,737
Recorded Investment with Allowance | 9,864 | 3,145
Related Allowance | 2 | 12
Average Recorded Investment | $ 11,050 | $ 3,539

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