Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (3) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Nonaccrual	$ 63,998	$ 65,238
Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,540	1,320
Nonaccrual	11,819	13,456
Total	13,359	14,776
Troubled Debt Restructurings [Member] | Construction Land Development and Other Land Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	4,757	6,247
Total	4,757	6,247
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,540	1,320
Nonaccrual	4,141	4,201
Total	5,681	5,521
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	2,215	2,292
Total	2,215	2,292
Troubled Debt Restructurings [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	164	167
Total	164	167
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	542	549
Total	$ 542	$ 549