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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | $ 1,934,779 |  | $ 1,745,340 |  |  |
Net loans | 1,920,553 |  | 1,730,806 |  |  |
Interest Due | 5,939 |  | 5,115 |  |  |
Deferred Fees / (Costs) | 3,046 |  | 3,792 |  |  |
Recorded Investment | 1,943,764 |  | 1,754,247 |  |  |
Recorded Investment | 1,929,538 |  | 1,739,713 |  |  |
Allowance for loan losses | (14,226) | $ (14,236) | (14,534) | $ (16,421) | $ (16,634) | $ (16,501)
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 872,605 |  | 802,792 |  |  |
Interest Due | 2,904 |  | 2,207 |  |  |
Deferred Fees / (Costs) | 1,975 |  | 2,203 |  |  |
Recorded Investment | 877,484 |  | 807,202 |  |  |
Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 697,048 |  | 579,367 |  |  |
Interest Due | 1,950 |  | 1,789 |  |  |
Deferred Fees / (Costs) | 2,277 |  | 2,470 |  |  |
Recorded Investment | 701,275 |  | 583,626 |  |  |
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 365,126 |  | 363,181 |  |  |
Interest Due | 1,085 |  | 1,119 |  |  |
Deferred Fees / (Costs) | (1,206) |  | (881) |  |  |
Recorded Investment | 365,005 |  | 363,419 |  |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 298,481 |  | 268,281 |  |  |
Interest Due | 1,068 |  | 613 |  |  |
Deferred Fees / (Costs) | 1,134 |  | 1,328 |  |  |
Recorded Investment | 300,683 |  | 270,222 |  |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 343,360 |  | 326,399 |  |  |
Interest Due | 346 |  | 306 |  |  |
Deferred Fees / (Costs) | 566 |  | 497 |  |  |
Recorded Investment | 344,272 |  | 327,202 |  |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 7,660 |  | 5,018 |  |  |
Interest Due | 13 |  | 9 |  |  |
Deferred Fees / (Costs) | 13 |  | 17 |  |  |
Recorded Investment | 7,686 |  | 5,044 |  |  |
Development & Spec Land Loans [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 23,171 |  | 18,183 |  |  |
Interest Due | 58 |  | 33 |  |  |
Deferred Fees / (Costs) | 16 |  | 26 |  |  |
Recorded Investment | 23,245 |  | 18,242 |  |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 199,933 |  | 184,911 |  |  |
Interest Due | 1,419 |  | 1,246 |  |  |
Deferred Fees / (Costs) | 246 |  | 335 |  |  |
Recorded Investment | 201,598 |  | 186,492 |  |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 473,563 |  | 414,924 |  |  |
Interest Due | 1,434 |  | 1,275 |  |  |
Deferred Fees / (Costs) | 2,277 |  | 2,470 |  |  |
Recorded Investment | 477,274 |  | 418,669 |  |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 17,786 |  | 19,751 |  |  |
Interest Due | 36 |  | 34 |  |  |
Recorded Investment | 17,822 |  | 19,785 |  |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 205,699 |  | 144,692 |  |  |
Interest Due | 480 |  | 480 |  |  |
Recorded Investment | 206,179 |  | 145,172 |  |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 59,105 |  | 54,341 |  |  |
Interest Due | 164 |  | 168 |  |  |
Deferred Fees / (Costs) | (383) |  | (359) |  |  |
Recorded Investment | 58,886 |  | 54,150 |  |  |
Direct Installment Purchased [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 131 |  | 153 |  |  |
Recorded Investment | 131 |  | 153 |  |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 144,935 |  | 151,523 |  |  |
Interest Due | 300 |  | 323 |  |  |
Recorded Investment | 145,235 |  | 151,846 |  |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 160,955 |  | 157,164 |  |  |
Interest Due | 621 |  | 628 |  |  |
Deferred Fees / (Costs) | (823) |  | (522) |  |  |
Recorded Investment | $ 160,753 |  | $ 157,270 |  |  |

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