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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | $ 2,141,236 | $ 2,130,369 |  |
Net loans | 2,126,182 | 2,115,532 |  |
Interest Due | 6,445 | 6,745 |  |
Deferred Fees / (Costs) | 5,717 | 5,617 |  |
Recorded Investment | 2,153,398 | 2,142,731 |  |
Recorded Investment | 2,138,344 | 2,127,894 |  |
Allowance for loan losses | (15,054) | (14,837) | $ (14,236) | $ (14,534)
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 1,102,641 | 1,066,199 |  |
Interest Due | 3,214 | 3,493 |  |
Deferred Fees / (Costs) | 3,830 | 3,757 |  |
Recorded Investment | 1,109,685 | 1,073,449 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 619,948 | 664,571 |  |
Interest Due | 1,984 | 2,005 |  |
Deferred Fees / (Costs) | 3,058 | 3,030 |  |
Recorded Investment | 624,990 | 669,606 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 418,647 | 399,599 |  |
Interest Due | 1,247 | 1,247 |  |
Deferred Fees / (Costs) | (1,171) | (1,170) |  |
Recorded Investment | 418,723 | 399,676 |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 339,341 | 337,548 |  |
Interest Due | 813 | 899 |  |
Deferred Fees / (Costs) | 951 | 1,022 |  |
Recorded Investment | 341,105 | 339,469 |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 475,766 | 461,897 |  |
Interest Due | 596 | 624 |  |
Deferred Fees / (Costs) | 2,340 | 2,176 |  |
Recorded Investment | 478,702 | 464,697 |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 6,437 | 5,006 |  |
Interest Due | 15 | 8 |  |
Deferred Fees / (Costs) |  | (2) |  |
Recorded Investment | 6,452 | 5,012 |  |
Development & Spec Land Loans [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 35,395 | 31,228 |  |
Interest Due | 58 | 56 |  |
Deferred Fees / (Costs) | 114 | 119 |  |
Recorded Investment | 35,567 | 31,403 |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 245,702 | 230,520 |  |
Interest Due | 1,732 | 1,906 |  |
Deferred Fees / (Costs) | 425 | 442 |  |
Recorded Investment | 247,859 | 232,868 |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 508,645 | 508,233 |  |
Interest Due | 1,461 | 1,492 |  |
Deferred Fees / (Costs) | 3,058 | 3,030 |  |
Recorded Investment | 513,164 | 512,755 |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 21,943 | 20,611 |  |
Interest Due | 43 | 33 |  |
Recorded Investment | 21,986 | 20,644 |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 89,360 | 135,727 |  |
Interest Due | 480 | 480 |  |
Recorded Investment | 89,840 | 136,207 |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 74,195 | 71,150 |  |
Interest Due | 201 | 199 |  |
Deferred Fees / (Costs) | (423) | (385) |  |
Recorded Investment | 73,973 | 70,964 |  |
Direct Installment Purchased [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 99 | 119 |  |
Recorded Investment | 99 | 119 |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 166,802 | 153,204 |  |
Interest Due | 355 | 345 |  |
Deferred Fees / (Costs) | 182 |  |  |
Recorded Investment | 167,339 | 153,549 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 177,551 | 175,126 |  |
Interest Due | 691 | 703 |  |
Deferred Fees / (Costs) | (930) | (785) |  |
Recorded Investment | $ 177,312 | $ 175,044 |  |

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