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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | $ 3,624,161 | $ 3,016,771 |  |
Net loans | 3,606,340 | 2,998,951 |  |
Interest Due | 12,445 | 9,793 |  |
Deferred Fees / (Costs) | (3,104) | (3,439) |  |
Recorded Investment | 3,633,502 | 3,023,125 |  |
Recorded Investment | 3,615,681 | 3,005,305 |  |
Allowance for loan losses | (17,821) | (17,820) | $ (16,474) | $ (16,394)
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 2,093,244 | 1,725,369 |  |
Interest Due | 7,187 | 5,596 |  |
Deferred Fees / (Costs) | (3,665) | (3,779) |  |
Recorded Investment | 2,096,766 | 1,727,186 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 893,711 | 744,286 |  |
Interest Due | 2,869 | 2,383 |  |
Deferred Fees / (Costs) | (1,943) | (2,025) |  |
Recorded Investment | 894,637 | 744,644 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 637,206 | 547,116 |  |
Interest Due | 2,389 | 1,814 |  |
Deferred Fees / (Costs) | 2,504 | 2,365 |  |
Recorded Investment | 642,099 | 551,295 |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 676,517 | 561,463 |  |
Interest Due | 975 | 1,240 |  |
Deferred Fees / (Costs) | (1,687) | (1,629) |  |
Recorded Investment | 675,805 | 561,074 |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 833,803 | 717,814 |  |
Interest Due | 1,645 | 1,063 |  |
Deferred Fees / (Costs) | (1,666) | (1,839) |  |
Recorded Investment | 833,782 | 717,038 |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 10,221 | 5,199 |  |
Interest Due | 27 | 13 |  |
Deferred Fees / (Costs) | (3) | (2) |  |
Recorded Investment | 10,245 | 5,210 |  |
Development & Spec Land [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 75,079 | 46,547 |  |
Interest Due | 249 | 131 |  |
Deferred Fees / (Costs) | (16) | (12) |  |
Recorded Investment | 75,312 | 46,666 |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 497,624 | 394,346 |  |
Interest Due | 4,291 | 3,149 |  |
Deferred Fees / (Costs) | (293) | (297) |  |
Recorded Investment | 501,622 | 397,198 |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 797,174 | 646,136 |  |
Interest Due | 2,346 | 1,861 |  |
Deferred Fees / (Costs) | (1,943) | (2,025) |  |
Recorded Investment | 797,577 | 645,972 |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 24,593 | 24,030 |  |
Interest Due | 43 | 42 |  |
Recorded Investment | 24,636 | 24,072 |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 71,944 | 74,120 |  |
Interest Due | 480 | 480 |  |
Recorded Investment | 72,424 | 74,600 |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 37,417 | 38,173 |  |
Interest Due | 135 | 103 |  |
Deferred Fees / (Costs) | 560 | 566 |  |
Recorded Investment | 38,112 | 38,842 |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 317,629 | 314,177 |  |
Interest Due | 750 | 738 |  |
Recorded Investment | 318,379 | 314,915 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 282,160 | 194,766 |  |
Interest Due | 1,504 | 973 |  |
Deferred Fees / (Costs) | 1,944 | 1,799 |  |
Recorded Investment | $ 285,608 | $ 197,538 |  |

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