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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | $ 3,673,814 |  | $ 3,016,771 |  |  |
Net loans | 3,655,509 |  | 2,998,951 |  |  |
Interest Due | 13,263 |  | 9,793 |  |  |
Deferred Fees / (Costs) | (9,146) |  | (3,439) |  |  |
Recorded Investment | 3,677,931 |  | 3,023,125 |  |  |
Recorded Investment | 3,659,626 |  | 3,005,305 |  |  |
Allowance for loan losses | (18,305) | $ (17,821) | (17,820) | $ (17,071) | $ (16,474) | $ (16,394)
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 2,067,533 |  | 1,725,369 |  |  |
Interest Due | 7,738 |  | 5,596 |  |  |
Deferred Fees / (Costs) | (4,910) |  | (3,779) |  |  |
Recorded Investment | 2,070,361 |  | 1,727,186 |  |  |
Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 954,644 |  | 744,286 |  |  |
Interest Due | 3,058 |  | 2,383 |  |  |
Deferred Fees / (Costs) | (7,151) |  | (2,025) |  |  |
Recorded Investment | 950,551 |  | 744,644 |  |  |
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 651,637 |  | 547,116 |  |  |
Interest Due | 2,467 |  | 1,814 |  |  |
Deferred Fees / (Costs) | 2,915 |  | 2,365 |  |  |
Recorded Investment | 657,019 |  | 551,295 |  |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 709,597 |  | 561,463 |  |  |
Interest Due | 1,253 |  | 1,240 |  |  |
Deferred Fees / (Costs) | (1,584) |  | (1,629) |  |  |
Recorded Investment | 709,266 |  | 561,074 |  |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 783,092 |  | 717,814 |  |  |
Interest Due | 1,464 |  | 1,063 |  |  |
Deferred Fees / (Costs) | (1,701) |  | (1,839) |  |  |
Recorded Investment | 782,855 |  | 717,038 |  |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 14,862 |  | 5,199 |  |  |
Interest Due | 36 |  | 13 |  |  |
Deferred Fees / (Costs) | (24) |  | (2) |  |  |
Recorded Investment | 14,874 |  | 5,210 |  |  |
Development & Spec Land [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 41,102 |  | 46,547 |  |  |
Interest Due | 179 |  | 131 |  |  |
Deferred Fees / (Costs) | 71 |  | (12) |  |  |
Recorded Investment | 41,352 |  | 46,666 |  |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 518,880 |  | 394,346 |  |  |
Interest Due | 4,806 |  | 3,149 |  |  |
Deferred Fees / (Costs) | (1,672) |  | (297) |  |  |
Recorded Investment | 522,014 |  | 397,198 |  |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 798,813 |  | 646,136 |  |  |
Interest Due | 2,521 |  | 1,861 |  |  |
Deferred Fees / (Costs) | (7,151) |  | (2,025) |  |  |
Recorded Investment | 794,183 |  | 645,972 |  |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 22,403 |  | 24,030 |  |  |
Interest Due | 57 |  | 42 |  |  |
Recorded Investment | 22,460 |  | 24,072 |  |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 133,428 |  | 74,120 |  |  |
Interest Due | 480 |  | 480 |  |  |
Recorded Investment | 133,908 |  | 74,600 |  |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 46,468 |  | 38,173 |  |  |
Interest Due | 156 |  | 103 |  |  |
Deferred Fees / (Costs) | 808 |  | 566 |  |  |
Recorded Investment | 47,432 |  | 38,842 |  |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 329,773 |  | 314,177 |  |  |
Interest Due | 806 |  | 738 |  |  |
Recorded Investment | 330,579 |  | 314,915 |  |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 275,396 |  | 194,766 |  |  |
Interest Due | 1,505 |  | 973 |  |  |
Deferred Fees / (Costs) | 2,107 |  | 1,799 |  |  |
Recorded Investment | $ 279,008 |  | $ 197,538 |  |  |

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