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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 2,961,481		$ 2,838,288
Net loans	2,943,683		2,821,894
Interest Due	10,093		9,226
Deferred Fees / (Costs)	(4,095)		(6,293)
Recorded Investment	2,967,479		2,841,221
Recorded Investment	2,949,681		2,824,827
Allowance for loan losses	(17,798)	$ (17,071)	(16,394)	$ (15,586)	$ (15,027)	$ (14,837)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,702,839		1,675,389
Interest Due	5,843		5,401
Deferred Fees / (Costs)	(4,257)		(5,661)
Recorded Investment	1,704,425		1,675,129
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	724,771		703,643
Interest Due	2,516		2,295
Deferred Fees / (Costs)	(2,099)		(2,375)
Recorded Investment	725,188		703,563
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	533,871		459,256
Interest Due	1,734		1,530
Deferred Fees / (Costs)	2,261		1,743
Recorded Investment	537,866		462,529
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	583,261		575,816
Interest Due	1,690		1,511
Deferred Fees / (Costs)	(1,693)		(1,917)
Recorded Investment	583,258		575,410
Non Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	704,284		683,901
Interest Due	1,091		1,138
Deferred Fees / (Costs)	(2,128)		(2,478)
Recorded Investment	703,247		682,561
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	7,254		16,591
Interest Due	16		63
Deferred Fees / (Costs)	(2)		(80)
Recorded Investment	7,268		16,574
Development & Spec Land [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	43,889		49,996
Interest Due	127		117
Deferred Fees / (Costs)	(27)		(579)
Recorded Investment	43,989		49,534
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	364,151		349,085
Interest Due	2,919		2,572
Deferred Fees / (Costs)	(407)		(607)
Recorded Investment	366,663		351,050
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	630,955		593,108
Interest Due	1,995		1,776
Deferred Fees / (Costs)	(2,099)		(2,375)
Recorded Investment	630,851		592,509
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	22,394		16,027
Interest Due	41		39
Recorded Investment	22,435		16,066
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	71,422		94,508
Interest Due	480		480
Recorded Investment	71,902		94,988
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	37,895		36,737
Interest Due	107		113
Deferred Fees / (Costs)	586		552
Recorded Investment	38,588		37,402
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	303,579		227,659
Interest Due	696		528
Deferred Fees / (Costs)			(168)
Recorded Investment	304,275		228,019
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	192,397		194,860
Interest Due	931		889
Deferred Fees / (Costs)	1,675		1,359
Recorded Investment	$ 195,003		$ 197,108

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