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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	$ 3,634,596	$ 3,011,570
Net loans	3,616,929	2,993,750
Interest Due	12,142	9,445
Deferred Fees / (Costs)	2,245	1,762
Recorded Investment	3,648,983	3,022,777
Recorded Investment	3,631,316	3,004,957
Allowance for loan losses	(17,667)	(17,820)	$ (16,394)	$ (14,837)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	2,047,646	1,722,552
Interest Due	7,252	5,596
Deferred Fees / (Costs)	(995)	(962)
Recorded Investment	2,053,903	1,727,186
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	920,998	742,244
Interest Due	2,527	2,035
Deferred Fees / (Costs)	12	17
Recorded Investment	923,537	744,296
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	665,952	546,774
Interest Due	2,363	1,814
Deferred Fees / (Costs)	3,228	2,707
Recorded Investment	671,543	551,295
Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	519,577	444,834
Interest Due	784	931
Deferred Fees / (Costs)	(148)	(130)
Recorded Investment	520,213	445,635
Non Owner Occupied Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	973,331	852,855
Interest Due	1,752	1,436
Deferred Fees / (Costs)	(763)	(747)
Recorded Investment	974,320	853,544
Residential Spec Homes [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	12,925	5,195
Interest Due	15	13
Deferred Fees / (Costs)	(2)
Recorded Investment	12,938	5,208
Development & Spec Land [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	35,954	50,706
Interest Due	101	153
Deferred Fees / (Costs)	(14)	(15)
Recorded Investment	36,041	50,844
Commercial and Industrial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	505,859	368,962
Interest Due	4,600	3,063
Deferred Fees / (Costs)	(68)	(70)
Recorded Investment	510,391	371,955
Residential Mortgage [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	751,019	644,094
Interest Due	2,245	1,861
Deferred Fees / (Costs)	12	17
Recorded Investment	753,276	645,972
Residential Construction [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	19,686	24,030
Interest Due	40	42
Recorded Investment	19,726	24,072
Mortgage Warehousing [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	150,293	74,120
Interest Due	242	132
Recorded Investment	150,535	74,252
Direct Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	41,079	35,103
Interest Due	148	108
Deferred Fees / (Costs)	678	593
Recorded Investment	41,905	35,804
Indirect Installment [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	348,658	314,177
Interest Due	911	738
Recorded Investment	349,569	314,915
Home Equity Loan [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Balance	276,215	197,494
Interest Due	1,304	968
Deferred Fees / (Costs)	2,550	2,114
Recorded Investment	$ 280,069	$ 200,576

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