Loans - Recorded Investment of Individual Loan Categories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 1,100,070	$ 1,067,935
Net loans	1,083,968	1,051,943
Interest Due	3,241	3,186
Deferred Fees / (Costs)	724	893
Recorded Investment	1,087,933	1,056,022
Allowance for loan losses	(16,102)	(15,992)	(19,565)	(18,270)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	528,031	504,584
Interest Due	1,246	1,161
Deferred Fees / (Costs)	604	605
Recorded Investment	529,881	506,350
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	291,687	283,732
Interest Due	1,073	1,072
Deferred Fees / (Costs)	352	382
Recorded Investment	293,112	285,186
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	280,352	279,619
Interest Due	922	953
Deferred Fees / (Costs)	(232)	(94)
Recorded Investment	281,042	280,478
Loan Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,100,070	1,067,935
Interest Due	3,241	3,186
Deferred Fees / (Costs)	724	893
Recorded Investment	1,104,035	1,072,014
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	173,514	156,262
Interest Due	268	257
Deferred Fees / (Costs)	245	207
Recorded Investment	174,027	156,726
Non-owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	230,225	224,713
Interest Due	201	105
Deferred Fees / (Costs)	266	299
Recorded Investment	230,692	225,117
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	833	400
Interest Due	1
Deferred Fees / (Costs)
Recorded Investment	834	400
Development & Spec Land Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	21,347	21,289
Interest Due	61	62
Deferred Fees / (Costs)	43	42
Recorded Investment	21,451	21,393
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	102,112	101,920
Interest Due	715	737
Deferred Fees / (Costs)	50	57
Recorded Investment	102,877	102,714
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	180,849	176,068
Interest Due	579	578
Deferred Fees / (Costs)	352	382
Recorded Investment	181,780	177,028
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	8,692	9,508
Interest Due	14	14
Deferred Fees / (Costs)
Recorded Investment	8,706	9,522
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	102,146	98,156
Interest Due	480	480
Deferred Fees / (Costs)
Recorded Investment	102,626	98,636
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	30,556	29,983
Interest Due	104	104
Deferred Fees / (Costs)	(278)	(281)
Recorded Investment	30,382	29,806
Direct Installment Purchased [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	270	294
Interest Due
Deferred Fees / (Costs)
Recorded Investment	270	294
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	131,394	131,384
Interest Due	301	320
Deferred Fees / (Costs)
Recorded Investment	131,695	131,704
Home Equity [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	118,132	117,958
Interest Due	517	529
Deferred Fees / (Costs)	46	187
Recorded Investment	$ 118,695	$ 118,674