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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | $ 3,016,771 | $ 2,841,473 |  |
Net loans | 2,998,951 | 2,825,079 |  |
Interest Due | 9,793 | 9,226 |  |
Deferred Fees / (Costs) | (3,439) | (6,293) |  |
Recorded Investment | 3,023,125 | 2,844,406 |  |
Recorded Investment | 3,005,305 | 2,828,012 |  |
Allowance for loan losses | (17,820) | (16,394) | $ (14,837) | $ (14,534)
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 1,725,369 | 1,675,595 |  |
Interest Due | 5,596 | 5,401 |  |
Deferred Fees / (Costs) | (3,779) | (5,661) |  |
Recorded Investment | 1,727,186 | 1,675,335 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 744,286 | 706,622 |  |
Interest Due | 2,383 | 2,295 |  |
Deferred Fees / (Costs) | (2,025) | (2,375) |  |
Recorded Investment | 744,644 | 706,542 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 547,116 | 459,256 |  |
Interest Due | 1,814 | 1,530 |  |
Deferred Fees / (Costs) | 2,365 | 1,743 |  |
Recorded Investment | 551,295 | 462,529 |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 561,463 | 576,022 |  |
Interest Due | 1,240 | 1,511 |  |
Deferred Fees / (Costs) | (1,629) | (1,917) |  |
Recorded Investment | 561,074 | 575,616 |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 717,814 | 683,901 |  |
Interest Due | 1,063 | 1,138 |  |
Deferred Fees / (Costs) | (1,839) | (2,478) |  |
Recorded Investment | 717,038 | 682,561 |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 5,199 | 16,591 |  |
Interest Due | 13 | 63 |  |
Deferred Fees / (Costs) | (2) | (80) |  |
Recorded Investment | 5,210 | 16,574 |  |
Development & Spec Land [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 46,547 | 49,996 |  |
Interest Due | 131 | 117 |  |
Deferred Fees / (Costs) | (12) | (579) |  |
Recorded Investment | 46,666 | 49,534 |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 394,346 | 349,085 |  |
Interest Due | 3,149 | 2,572 |  |
Deferred Fees / (Costs) | (297) | (607) |  |
Recorded Investment | 397,198 | 351,050 |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 646,136 | 596,087 |  |
Interest Due | 1,861 | 1,776 |  |
Deferred Fees / (Costs) | (2,025) | (2,375) |  |
Recorded Investment | 645,972 | 595,488 |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 24,030 | 16,027 |  |
Interest Due | 42 | 39 |  |
Recorded Investment | 24,072 | 16,066 |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 74,120 | 94,508 |  |
Interest Due | 480 | 480 |  |
Recorded Investment | 74,600 | 94,988 |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 38,173 | 36,737 |  |
Interest Due | 103 | 113 |  |
Deferred Fees / (Costs) | 566 | 552 |  |
Recorded Investment | 38,842 | 37,402 |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 314,177 | 227,659 |  |
Interest Due | 738 | 528 |  |
Deferred Fees / (Costs) |  | (168) |  |
Recorded Investment | 314,915 | 228,019 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 194,766 | 194,860 |  |
Interest Due | 973 | 889 |  |
Deferred Fees / (Costs) | 1,799 | 1,359 |  |
Recorded Investment | $ 197,538 | $ 197,108 |  |

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