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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | $ 1,716,660 | $ 1,745,340 |  |
Net loans | 1,702,424 | 1,730,806 |  |
Interest Due | 4,988 | 5,115 |  |
Deferred Fees / (Costs) | 3,412 | 3,792 |  |
Recorded Investment | 1,725,060 | 1,754,247 |  |
Recorded Investment | 1,710,824 | 1,739,713 |  |
Allowance for loan losses | (14,236) | (14,534) | $ (16,634) | $ (16,501)
Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 795,701 | 802,792 |  |
Interest Due | 2,106 | 2,207 |  |
Deferred Fees / (Costs) | 2,053 | 2,203 |  |
Recorded Investment | 799,860 | 807,202 |  |
Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 560,318 | 579,367 |  |
Interest Due | 1,797 | 1,789 |  |
Deferred Fees / (Costs) | 2,364 | 2,470 |  |
Recorded Investment | 564,479 | 583,626 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 360,641 | 363,181 |  |
Interest Due | 1,085 | 1,119 |  |
Deferred Fees / (Costs) | (1,005) | (881) |  |
Recorded Investment | 360,721 | 363,419 |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 264,899 | 268,281 |  |
Interest Due | 611 | 613 |  |
Deferred Fees / (Costs) | 1,205 | 1,328 |  |
Recorded Investment | 266,715 | 270,222 |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 324,824 | 326,399 |  |
Interest Due | 336 | 306 |  |
Deferred Fees / (Costs) | 506 | 497 |  |
Recorded Investment | 325,666 | 327,202 |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 7,011 | 5,018 |  |
Interest Due | 12 | 9 |  |
Deferred Fees / (Costs) | 17 | 17 |  |
Recorded Investment | 7,040 | 5,044 |  |
Development & Spec Land Loans [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 19,961 | 18,183 |  |
Interest Due | 46 | 33 |  |
Deferred Fees / (Costs) | 18 | 26 |  |
Recorded Investment | 20,025 | 18,242 |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 179,006 | 184,911 |  |
Interest Due | 1,101 | 1,246 |  |
Deferred Fees / (Costs) | 307 | 335 |  |
Recorded Investment | 180,414 | 186,492 |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 421,422 | 414,924 |  |
Interest Due | 1,283 | 1,275 |  |
Deferred Fees / (Costs) | 2,364 | 2,470 |  |
Recorded Investment | 425,069 | 418,669 |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 19,020 | 19,751 |  |
Interest Due | 34 | 34 |  |
Recorded Investment | 19,054 | 19,785 |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 119,876 | 144,692 |  |
Interest Due | 480 | 480 |  |
Recorded Investment | 120,356 | 145,172 |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 56,767 | 54,341 |  |
Interest Due | 160 | 168 |  |
Deferred Fees / (Costs) | (360) | (359) |  |
Recorded Investment | 56,567 | 54,150 |  |
Direct Installment Purchased [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 140 | 153 |  |
Recorded Investment | 140 | 153 |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 147,574 | 151,523 |  |
Interest Due | 304 | 323 |  |
Recorded Investment | 147,878 | 151,846 |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance | 156,160 | 157,164 |  |
Interest Due | 621 | 628 |  |
Deferred Fees / (Costs) | (645) | (522) |  |
Recorded Investment | $ 156,136 | $ 157,270 |  |

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