LHFI and Allowance for Loan Losses, LHFI - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	$ 69,894	$ 96,365
Total LHFI With No Related Allowance Recorded	12,852	23,135
Total LHFI With an Allowance Recorded	42,460	56,208
Total LHFI Carrying Amount	55,312	79,343
Related Allowance	8,988	12,764
Average Recorded Investment	67,327	72,291
Commercial and Industrial Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	9,880	13,916
Total LHFI With No Related Allowance Recorded	1,137	1,206
Total LHFI With an Allowance Recorded	6,485	10,898
Total LHFI Carrying Amount	7,622	12,104
Related Allowance	3,304	6,449
Average Recorded Investment	9,863	9,195
Consumer Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	34	152
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	31	88
Total LHFI Carrying Amount	31	88
Related Allowance	0	0
Average Recorded Investment	59	120
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	642	734
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	512	628
Total LHFI Carrying Amount	512	628
Related Allowance	128	259
Average Recorded Investment	570	682
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	11,113	20,849
Total LHFI With No Related Allowance Recorded	3,395	7,411
Total LHFI With an Allowance Recorded	2,728	6,456
Total LHFI Carrying Amount	6,123	13,867
Related Allowance	909	2,767
Average Recorded Investment	9,995	13,597
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	27,678	31,151
Total LHFI With No Related Allowance Recorded	283	1,650
Total LHFI With an Allowance Recorded	22,796	23,971
Total LHFI Carrying Amount	23,079	25,621
Related Allowance	1,230	450
Average Recorded Investment	24,350	23,612
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	20,387	27,969
Total LHFI With No Related Allowance Recorded	8,037	12,868
Total LHFI With an Allowance Recorded	9,763	12,849
Total LHFI Carrying Amount	17,800	25,717
Related Allowance	3,402	2,787
Average Recorded Investment	21,758	23,763
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	160	1,594
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	145	1,318
Total LHFI Carrying Amount	145	1,318
Related Allowance	15	52
Average Recorded Investment	$ 732	$ 1,322