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Loans - Recorded Investment of Individual Loan Categories (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | $ 1,341,550 |  | $ 1,067,935 |  |  |
Net loans | 1,325,390 |  | 1,051,943 |  |  |
Interest Due | 4,128 |  | 3,186 |  |  |
Deferred Fees / (Costs) | 1,471 |  | 893 |  |  |
Recorded Investment | 1,330,989 |  | 1,056,022 |  |  |
Allowance for loan losses | (16,160) | (15,660) | (15,992) | (18,880) | (19,565) | (18,270)
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 676,022 |  | 504,584 |  |  |
Interest Due | 1,606 |  | 1,161 |  |  |
Deferred Fees / (Costs) | 1,327 |  | 605 |  |  |
Recorded Investment | 678,955 |  | 506,350 |  |  |
Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 356,244 |  | 283,732 |  |  |
Interest Due | 1,548 |  | 1,072 |  |  |
Deferred Fees / (Costs) | 628 |  | 382 |  |  |
Recorded Investment | 358,420 |  | 285,186 |  |  |
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 309,284 |  | 279,619 |  |  |
Interest Due | 974 |  | 953 |  |  |
Deferred Fees / (Costs) | (484) |  | (94) |  |  |
Recorded Investment | 309,774 |  | 280,478 |  |  |
Loan Receivable [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 1,341,550 |  | 1,067,935 |  |  |
Interest Due | 4,128 |  | 3,186 |  |  |
Deferred Fees / (Costs) | 1,471 |  | 893 |  |  |
Recorded Investment | 1,347,149 |  | 1,072,014 |  |  |
Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 233,069 |  | 156,262 |  |  |
Interest Due | 390 |  | 257 |  |  |
Deferred Fees / (Costs) | 678 |  | 207 |  |  |
Recorded Investment | 234,137 |  | 156,726 |  |  |
Non Owner Occupied Real Estate [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 298,408 |  | 224,713 |  |  |
Interest Due | 352 |  | 105 |  |  |
Deferred Fees / (Costs) | 545 |  | 299 |  |  |
Recorded Investment | 299,305 |  | 225,117 |  |  |
Residential Spec Homes [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 1,289 |  | 400 |  |  |
Interest Due | 2 |  |  |  |  |
Deferred Fees / (Costs) |  |  |  |  |  |
Recorded Investment | 1,291 |  | 400 |  |  |
Development & Spec Land Loans [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 12,574 |  | 21,289 |  |  |
Interest Due | 20 |  | 62 |  |  |
Deferred Fees / (Costs) | 37 |  | 42 |  |  |
Recorded Investment | 12,631 |  | 21,393 |  |  |
Commercial and Industrial [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 130,682 |  | 101,920 |  |  |
Interest Due | 842 |  | 737 |  |  |
Deferred Fees / (Costs) | 67 |  | 57 |  |  |
Recorded Investment | 131,591 |  | 102,714 |  |  |
Residential Mortgage [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 239,989 |  | 176,068 |  |  |
Interest Due | 1,048 |  | 578 |  |  |
Deferred Fees / (Costs) | 628 |  | 382 |  |  |
Recorded Investment | 241,665 |  | 177,028 |  |  |
Residential Construction [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 11,122 |  | 9,508 |  |  |
Interest Due | 20 |  | 14 |  |  |
Deferred Fees / (Costs) |  |  |  |  |  |
Recorded Investment | 11,142 |  | 9,522 |  |  |
Mortgage Warehousing [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 105,133 |  | 98,156 |  |  |
Interest Due | 480 |  | 480 |  |  |
Deferred Fees / (Costs) |  |  |  |  |  |
Recorded Investment | 105,613 |  | 98,636 |  |  |
Direct Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 36,720 |  | 29,983 |  |  |
Interest Due | 111 |  | 104 |  |  |
Deferred Fees / (Costs) | (380) |  | (281) |  |  |
Recorded Investment | 36,451 |  | 29,806 |  |  |
Direct Installment Purchased [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 236 |  | 294 |  |  |
Interest Due |  |  |  |  |  |
Deferred Fees / (Costs) |  |  |  |  |  |
Recorded Investment | 236 |  | 294 |  |  |
Indirect Installment [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 139,138 |  | 131,384 |  |  |
Interest Due | 298 |  | 320 |  |  |
Deferred Fees / (Costs) |  |  |  |  |  |
Recorded Investment | 139,436 |  | 131,704 |  |  |
Home Equity [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan Balance | 133,190 |  | 117,958 |  |  |
Interest Due | 565 |  | 529 |  |  |
Deferred Fees / (Costs) | (104) |  | 187 |  |  |
Recorded Investment | $ 133,651 |  | $ 118,674 |  |  |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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