Allowance for Loan Losses - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 32,822	$ 28,118	$ 32,423	$ 27,122
Provision for Loan Losses	2,551	2,529	3,948	3,614
Charge- Offs	(2,644)	(2,314)	(4,123)	(2,819)
Recoveries	803	624	1,319	1,128
TDR Allowance Adjustments	(27)	(33)	(62)	(121)
Ending Balance	33,505	28,924	33,505	28,924
Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,320	2,058	2,233	1,642
Provision for Loan Losses	(79)	224	4	635
Charge- Offs	(1)	0	0	0
Recoveries	3	5	7	10
TDR Allowance Adjustments	0	0	(1)	0
Ending Balance	2,243	2,287	2,243	2,287
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,753	8,842	11,112	9,285
Provision for Loan Losses	(433)	210	192	(365)
Charge- Offs	0	(14)	(16)	(14)
Recoveries	565	103	612	250
TDR Allowance Adjustments	(15)	(15)	(30)	(30)
Ending Balance	11,870	9,126	11,870	9,126
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,445	8,047	7,775	7,131
Provision for Loan Losses	51	414	(363)	1,201
Charge- Offs	(28)	(27)	(65)	(27)
Recoveries	51	433	190	634
TDR Allowance Adjustments	(11)	(17)	(29)	(89)
Ending Balance	7,508	8,850	7,508	8,850
Commercial and financial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,573	7,393	8,585	7,297
Provision for Loan Losses	2,114	1,630	2,967	1,900
Charge- Offs	(1,881)	(1,945)	(2,825)	(2,143)
Recoveries	106	24	185	48
TDR Allowance Adjustments	0	0	0	0
Ending Balance	8,912	7,102	8,912	7,102
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,731	1,778	2,718	1,767
Provision for Loan Losses	898	51	1,148	243
Charge- Offs	(734)	(328)	(1,217)	(635)
Recoveries	78	59	325	186
TDR Allowance Adjustments	(1)	(1)	(2)	(2)
Ending Balance	$ 2,972	$ 1,559	$ 2,972	$ 1,559