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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 2,421,076		$ 2,130,369
Net loans	2,405,490		2,115,532
Interest Due	8,417		6,745
Deferred Fees / (Costs)	4,749		5,617
Recorded Investment	2,434,242		2,142,731
Recorded Investment	2,418,656		2,127,894
Allowance for loan losses	(15,586)	$ (15,027)	(14,837)	$ (14,524)	$ (14,226)	$ (14,534)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,270,160		1,066,199
Interest Due	4,613		3,493
Deferred Fees / (Costs)	3,630		3,757
Recorded Investment	1,278,403		1,073,449
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	663,759		664,571
Interest Due	2,323		2,005
Deferred Fees / (Costs)	2,786		3,030
Recorded Investment	668,868		669,606
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	487,157		399,599
Interest Due	1,481		1,247
Deferred Fees / (Costs)	(1,667)		(1,170)
Recorded Investment	486,971		399,676
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	403,184		337,548
Interest Due	1,371		899
Deferred Fees / (Costs)	880		1,022
Recorded Investment	405,435		339,469
Non Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	531,560		461,897
Interest Due	656		624
Deferred Fees / (Costs)	2,202		2,176
Recorded Investment	534,418		464,697
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	4,031		5,006
Interest Due	11		8
Deferred Fees / (Costs)			(2)
Recorded Investment	4,042		5,012
Development & Spec Land Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	43,299		31,228
Interest Due	100		56
Deferred Fees / (Costs)	84		119
Recorded Investment	43,483		31,403
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	288,086		230,520
Interest Due	2,475		1,906
Deferred Fees / (Costs)	464		442
Recorded Investment	291,025		232,868
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	553,451		508,233
Interest Due	1,814		1,492
Deferred Fees / (Costs)	2,786		3,030
Recorded Investment	558,051		512,755
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	14,825		20,611
Interest Due	29		33
Recorded Investment	14,854		20,644
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	95,483		135,727
Interest Due	480		480
Recorded Investment	95,963		136,207
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	85,726		71,150
Interest Due	249		199
Deferred Fees / (Costs)	(566)		(385)
Recorded Investment	85,409		70,964
Direct Installment Purchased [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	88		119
Recorded Investment	88		119
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	207,293		153,204
Interest Due	437		345
Deferred Fees / (Costs)	173
Recorded Investment	207,903		153,549
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	194,050		175,126
Interest Due	795		703
Deferred Fees / (Costs)	(1,274)		(785)
Recorded Investment	$ 193,571		$ 175,044

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