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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 2,825,702	$ 2,130,369
Net loans	2,809,308	2,115,532
Interest Due	9,226	6,745
Deferred Fees / (Costs)	6,293	5,617
Recorded Investment	2,841,221	2,142,731
Recorded Investment	2,824,827	2,127,894
Allowance for loan losses	(16,394)	(14,837)	$ (14,534)	$ (16,501)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	1,612,209	1,066,199
Interest Due	5,244	3,493
Deferred Fees / (Costs)	5,661	3,757
Recorded Investment	1,623,114	1,073,449
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	698,893	664,571
Interest Due	2,295	2,005
Deferred Fees / (Costs)	2,375	3,030
Recorded Investment	703,563	669,606
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	514,600	399,599
Interest Due	1,687	1,247
Deferred Fees / (Costs)	(1,743)	(1,170)
Recorded Investment	514,544	399,676
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	547,596	337,548
Interest Due	1,441	899
Deferred Fees / (Costs)	1,917	1,022
Recorded Investment	550,954	339,469
Non Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	664,281	461,897
Interest Due	1,100	624
Deferred Fees / (Costs)	2,478	2,176
Recorded Investment	667,859	464,697
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	16,431	5,006
Interest Due	63	8
Deferred Fees / (Costs)	80	(2)
Recorded Investment	16,574	5,012
Development & Spec Land Loans [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	48,674	31,228
Interest Due	116	56
Deferred Fees / (Costs)	579	119
Recorded Investment	49,369	31,403
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	335,227	230,520
Interest Due	2,524	1,906
Deferred Fees / (Costs)	607	442
Recorded Investment	338,358	232,868
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	588,358	508,233
Interest Due	1,776	1,492
Deferred Fees / (Costs)	2,375	3,030
Recorded Investment	592,509	512,755
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	16,027	20,611
Interest Due	39	33
Recorded Investment	16,066	20,644
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	94,508	135,727
Interest Due	480	480
Recorded Investment	94,988	136,207
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	89,617	71,150
Interest Due	270	199
Deferred Fees / (Costs)	(552)	(385)
Recorded Investment	89,335	70,964
Direct Installment Purchased [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	82	119
Recorded Investment	82	119
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	227,323	153,204
Interest Due	528	345
Deferred Fees / (Costs)	168
Recorded Investment	228,019	153,549
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	197,578	175,126
Interest Due	889	703
Deferred Fees / (Costs)	(1,359)	(785)
Recorded Investment	$ 197,108	$ 175,044

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