Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (3) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Modifications [Line Items]
Nonaccrual	$ 71,118	$ 65,238
Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,543	1,320	1,492
Nonaccrual	11,063	13,456	17,769
Total	12,606	14,776	19,261
Troubled Debt Restructurings [Member] | Construction Land Development and Other Land Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	229
Nonaccrual	4,521	6,247	9,322
Total	4,521	6,247	9,551
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,543	1,320	1,263
Nonaccrual	3,873	4,201	5,275
Total	5,416	5,521	6,538
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	1,979	2,292	2,419
Total	1,979	2,292	2,419
Troubled Debt Restructurings [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	159	167	178
Total	159	167	178
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	531	549	575
Total	$ 531	$ 549	$ 575