Loans - Recorded Investment of Individual Loan Categories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Apr. 01, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 1,319,828		$ 1,067,935
Net loans	1,304,168		1,051,943
Interest Due	3,922		3,186
Deferred Fees / (Costs)	1,666		893
Recorded Investment	1,309,756		1,056,022
Allowance for loan losses	(15,660)	(16,102)	(15,992)	(18,880)	(19,565)	(18,270)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	646,896		504,584
Interest Due	1,589		1,161
Deferred Fees / (Costs)	1,306		605
Recorded Investment	649,791		506,350
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	375,783		283,732
Interest Due	1,369		1,072
Deferred Fees / (Costs)	636		382
Recorded Investment	377,788		285,186
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	297,149		279,619
Interest Due	964		953
Deferred Fees / (Costs)	(276)		(94)
Recorded Investment	297,837		280,478
Loan Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,319,828		1,067,935
Interest Due	3,922		3,186
Deferred Fees / (Costs)	1,666		893
Recorded Investment	1,325,416		1,072,014
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	206,000		156,262
Interest Due	332		257
Deferred Fees / (Costs)	642		207
Recorded Investment	206,974		156,726
Non-owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	294,681		224,713
Interest Due	345		105
Deferred Fees / (Costs)	542		299
Recorded Investment	295,568		225,117
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	835		400
Interest Due	1
Deferred Fees / (Costs)
Recorded Investment	836		400
Development & Spec Land Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	24,188		21,289
Interest Due	81		62
Deferred Fees / (Costs)	33		42
Recorded Investment	24,302		21,393
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	121,192		101,920
Interest Due	830		737
Deferred Fees / (Costs)	89		57
Recorded Investment	122,111		102,714
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	225,819		176,068
Interest Due	872		578
Deferred Fees / (Costs)	636		382
Recorded Investment	227,327		177,028
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	9,068		9,508
Interest Due	17		14
Deferred Fees / (Costs)
Recorded Investment	9,085		9,522
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	140,896		98,156
Interest Due	480		480
Deferred Fees / (Costs)
Recorded Investment	141,376		98,636
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	34,106		29,983
Interest Due	110		104
Deferred Fees / (Costs)	(335)		(281)
Recorded Investment	33,881		29,806
Direct Installment Purchased [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	256		294
Interest Due
Deferred Fees / (Costs)
Recorded Investment	256		294
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	132,053		131,384
Interest Due	287		320
Deferred Fees / (Costs)
Recorded Investment	132,340		131,704
Home Equity [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	130,734		117,958
Interest Due	567		529
Deferred Fees / (Costs)	59		187
Recorded Investment	$ 131,360		$ 118,674