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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 2,919,888		$ 2,825,702
Net loans	2,902,817		2,809,308
Interest Due	9,063		9,226
Deferred Fees / (Costs)	4,628		6,293
Recorded Investment	2,933,579		2,841,221
Recorded Investment	2,916,508		2,824,827
Allowance for Loan Losses	(17,071)	$ (16,474)	(16,394)	$ (15,027)	$ (15,054)	$ (14,837)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,668,397		1,664,067
Interest Due	5,123		5,401
Deferred Fees / (Costs)	4,601		5,661
Recorded Investment	1,678,121		1,675,129
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	741,472		698,893
Interest Due	2,347		2,295
Deferred Fees / (Costs)	2,180		2,375
Recorded Investment	745,999		703,563
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	510,019		462,742
Interest Due	1,593		1,530
Deferred Fees / (Costs)	(2,153)		(1,743)
Recorded Investment	509,459		462,529
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	591,273		571,982
Interest Due	1,446		1,511
Deferred Fees / (Costs)	2,000		1,917
Recorded Investment	594,719		575,410
Non Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	678,913		678,945
Interest Due	980		1,138
Deferred Fees / (Costs)	2,100		2,478
Recorded Investment	681,993		682,561
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	11,614		16,431
Interest Due	27		63
Deferred Fees / (Costs)	45		80
Recorded Investment	11,686		16,574
Development & Spec Land [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	34,384		48,838
Interest Due	97		117
Deferred Fees / (Costs)	28		579
Recorded Investment	34,509		49,534
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	352,213		347,871
Interest Due	2,573		2,572
Deferred Fees / (Costs)	428		607
Recorded Investment	355,214		351,050
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	610,871		588,358
Interest Due	1,827		1,776
Deferred Fees / (Costs)	2,180		2,375
Recorded Investment	614,878		592,509
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	21,585		16,027
Interest Due	40		39
Recorded Investment	21,625		16,066
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	109,016		94,508
Interest Due	480		480
Recorded Investment	109,496		94,988
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	39,065		37,841
Interest Due	103		113
Deferred Fees / (Costs)	(576)		(552)
Recorded Investment	38,592		37,402
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	276,317		227,323
Interest Due	607		528
Deferred Fees / (Costs)			168
Recorded Investment	276,924		228,019
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	194,637		197,578
Interest Due	883		889
Deferred Fees / (Costs)	(1,577)		(1,359)
Recorded Investment	$ 193,943		$ 197,108

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