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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 2,141,236	$ 2,130,369
Net loans	2,126,182	2,115,532
Interest Due	6,445	6,745
Deferred Fees / (Costs)	5,717	5,617
Recorded Investment	2,153,398	2,142,731
Recorded Investment	2,138,344	2,127,894
Allowance for loan losses	(15,054)	(14,837)	$ (14,236)	$ (14,534)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,102,641	1,066,199
Interest Due	3,214	3,493
Deferred Fees / (Costs)	3,830	3,757
Recorded Investment	1,109,685	1,073,449
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	619,948	664,571
Interest Due	1,984	2,005
Deferred Fees / (Costs)	3,058	3,030
Recorded Investment	624,990	669,606
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	418,647	399,599
Interest Due	1,247	1,247
Deferred Fees / (Costs)	(1,171)	(1,170)
Recorded Investment	418,723	399,676
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	339,341	337,548
Interest Due	813	899
Deferred Fees / (Costs)	951	1,022
Recorded Investment	341,105	339,469
Non Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	475,766	461,897
Interest Due	596	624
Deferred Fees / (Costs)	2,340	2,176
Recorded Investment	478,702	464,697
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	6,437	5,006
Interest Due	15	8
Deferred Fees / (Costs)		(2)
Recorded Investment	6,452	5,012
Development & Spec Land Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	35,395	31,228
Interest Due	58	56
Deferred Fees / (Costs)	114	119
Recorded Investment	35,567	31,403
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	245,702	230,520
Interest Due	1,732	1,906
Deferred Fees / (Costs)	425	442
Recorded Investment	247,859	232,868
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	508,645	508,233
Interest Due	1,461	1,492
Deferred Fees / (Costs)	3,058	3,030
Recorded Investment	513,164	512,755
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	21,943	20,611
Interest Due	43	33
Recorded Investment	21,986	20,644
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	89,360	135,727
Interest Due	480	480
Recorded Investment	89,840	136,207
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	74,195	71,150
Interest Due	201	199
Deferred Fees / (Costs)	(423)	(385)
Recorded Investment	73,973	70,964
Direct Installment Purchased [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	99	119
Recorded Investment	99	119
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	166,802	153,204
Interest Due	355	345
Deferred Fees / (Costs)	182
Recorded Investment	167,339	153,549
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	177,551	175,126
Interest Due	691	703
Deferred Fees / (Costs)	(930)	(785)
Recorded Investment	$ 177,312	$ 175,044

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