Loans - Roll Forward of Activity In Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Allowance for loan losses:
Beginning balance	$ 17,430	$ 26,888
Charge-offs	(384)	(1,836)
Recoveries	133	319
Provision	7,600	0
Ending balance	24,779	25,371
Ending balance: individually evaluated for impairment	8,115	6,164
Ending balance: collectively evaluated for impairment	16,664	19,207
Loans:
Ending balance	893,650	1,137,255	$ 899,785
Ending balance: individually evaluated for impairment	21,673	83,427
Ending balance: collectively evaluated for impairment	871,977	1,053,828
Commercial, financial and agricultural
Allowance for loan losses:
Beginning balance	10,633	20,577
Charge-offs	(293)	(1,524)
Recoveries	82	276
Provision	8,431	(264)
Ending balance	18,853	19,065
Ending balance: individually evaluated for impairment	8,040	5,968
Ending balance: collectively evaluated for impairment	10,813	13,097
Loans:
Ending balance	255,410	401,048	267,340
Ending balance: individually evaluated for impairment	16,938	55,092
Ending balance: collectively evaluated for impairment	238,472	345,956
Real estate – construction
Allowance for loan losses:
Beginning balance	140	596
Charge-offs	0	(2)
Recoveries	0	0
Provision	271	159
Ending balance	411	753
Ending balance: individually evaluated for impairment	0	94
Ending balance: collectively evaluated for impairment	411	659
Loans:
Ending balance	89,723	94,679	87,506
Ending balance: individually evaluated for impairment	323	192
Ending balance: collectively evaluated for impairment	89,400	94,487
Real estate – commercial
Allowance for loan losses:
Beginning balance	4,913	3,918
Charge-offs		(86)
Recoveries	25	6
Provision	(560)	(105)
Ending balance	4,378	3,733
Ending balance: individually evaluated for impairment	75	76
Ending balance: collectively evaluated for impairment	4,303	3,657
Loans:
Ending balance	376,523	444,277	368,449
Ending balance: individually evaluated for impairment	4,412	26,005
Ending balance: collectively evaluated for impairment	372,111	418,272
Real estate – residential
Allowance for loan losses:
Beginning balance	1,156	837
Charge-offs	0	(3)
Recoveries	1	1
Provision	(504)	64
Ending balance	653	899
Ending balance: individually evaluated for impairment	0	20
Ending balance: collectively evaluated for impairment	653	879
Loans:
Ending balance	130,700	145,671	132,435
Ending balance: individually evaluated for impairment	0	2,088
Ending balance: collectively evaluated for impairment	130,700	143,583
Consumer and other
Allowance for loan losses:
Beginning balance	585	957
Charge-offs	(91)	(221)
Recoveries	25	36
Provision	(35)	146
Ending balance	484	918
Ending balance: individually evaluated for impairment	0	6
Ending balance: collectively evaluated for impairment	484	912
Loans:
Ending balance	40,784	50,888	43,506
Ending balance: individually evaluated for impairment	0	50
Ending balance: collectively evaluated for impairment	40,784	50,838
Lease financing receivable
Allowance for loan losses:
Beginning balance	3	3
Charge-offs	0	0
Recoveries	0	0
Provision	(3)	0
Ending balance	0	3
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	0	3
Loans:
Ending balance	510	692	$ 549
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 510	$ 692