Loans and Allowance - Information regarding troubled debt restructurings by class and new troubled debt restructuring (Details 8) (Loans Receivable, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Loan	Mar. 31, 2013 Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of troubled debt restructuring	35	40
Total Troubled Debt Restructured	$ 9,730	$ 11,997
Number of Loans	5	14
Pre-Modification Recorded Balance	2,111	1,213
Post-Modification Recorded Balance	2,397	1,448
Construction/Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of troubled debt restructuring	11	6
Total Troubled Debt Restructured	4,124	4,285
Number of Loans	1	2
Pre-Modification Recorded Balance	219
Post-Modification Recorded Balance	218	170
One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of troubled debt restructuring	11	15
Total Troubled Debt Restructured	2,840	3,864
Number of Loans	3	6
Pre-Modification Recorded Balance	1,892	240
Post-Modification Recorded Balance	2,163	245
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of troubled debt restructuring	1	1
Total Troubled Debt Restructured	1,015	1,038
Number of Loans
Pre-Modification Recorded Balance
Post-Modification Recorded Balance
Nonresidential and agricultural land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of troubled debt restructuring	4	7
Total Troubled Debt Restructured	1,487	2,455
Number of Loans		2
Pre-Modification Recorded Balance		935
Post-Modification Recorded Balance		935
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of troubled debt restructuring	8	11
Total Troubled Debt Restructured	264	355
Number of Loans	1	4
Pre-Modification Recorded Balance		38
Post-Modification Recorded Balance	16	98
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of troubled debt restructuring
Total Troubled Debt Restructured
Number of Loans
Pre-Modification Recorded Balance
Post-Modification Recorded Balance