LHFI and Allowance for Loan Losses, LHFI - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	$ 61,150	$ 69,894
Total LHFI With No Related Allowance Recorded	19,821	12,852
Total LHFI With an Allowance Recorded	29,413	42,460
Total LHFI Carrying Amount	49,234	55,312
Related Allowance	5,544	8,988
Average Recorded Investment	52,273	67,327
Commercial and Industrial Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	16,887	9,880
Total LHFI With No Related Allowance Recorded	11,461	1,137
Total LHFI With an Allowance Recorded	4,363	6,485
Total LHFI Carrying Amount	15,824	7,622
Related Allowance	2,425	3,304
Average Recorded Investment	11,723	9,863
Consumer Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	303	34
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	300	31
Total LHFI Carrying Amount	300	31
Related Allowance	3	0
Average Recorded Investment	165	59
State and Other Political Subdivision Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	0	0
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	0	0
Total LHFI Carrying Amount	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Other Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	756	642
Total LHFI With No Related Allowance Recorded	95	0
Total LHFI With an Allowance Recorded	479	512
Total LHFI Carrying Amount	574	512
Related Allowance	111	128
Average Recorded Investment	543	570
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	6,743	11,113
Total LHFI With No Related Allowance Recorded	2,260	3,395
Total LHFI With an Allowance Recorded	1,063	2,728
Total LHFI Carrying Amount	3,323	6,123
Related Allowance	616	909
Average Recorded Investment	4,723	9,995
Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	24,805	27,678
Total LHFI With No Related Allowance Recorded	221	283
Total LHFI With an Allowance Recorded	20,108	22,796
Total LHFI Carrying Amount	20,329	23,079
Related Allowance	1,420	1,230
Average Recorded Investment	21,704	24,350
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	11,227	20,387
Total LHFI With No Related Allowance Recorded	5,784	8,037
Total LHFI With an Allowance Recorded	2,698	9,763
Total LHFI Carrying Amount	8,482	17,800
Related Allowance	851	3,402
Average Recorded Investment	13,141	21,758
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	429	160
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	402	145
Total LHFI Carrying Amount	402	145
Related Allowance	118	15
Average Recorded Investment	$ 274	$ 732