Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (3) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Financing Receivable, Modifications [Line Items]
Nonaccrual	$ 88,314	$ 65,238
Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,373	1,320	1,482
Nonaccrual	10,619	13,456	15,360
Total	11,992	14,776	16,842
Troubled Debt Restructurings [Member] | Construction Land Development and Other Land Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	227
Nonaccrual	4,076	6,247	7,304
Total	4,076	6,247	7,531
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,373	1,320	1,255
Nonaccrual	3,940	4,201	4,965
Total	5,313	5,521	6,220
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	1,923	2,292	2,349
Total	1,923	2,292	2,349
Troubled Debt Restructurings [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	156	167	174
Total	156	167	174
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	524	549	568
Total	$ 524	$ 549	$ 568