Loans and Allowance - Information regarding newly restructured troubled debt by type of modification (Details 9) (Loans Receivable, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term	14	1,586
Combination	1,434	705
Total Modifications	1,448	2,291
Construction / Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination	171
Total Modifications	170
One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term	14	503
Combination	231	595
Total Modifications	245	1,098
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term		1,083
Combination
Total Modifications		1,083
Nonresidential real estate and agricultural land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination	935	40
Total Modifications	935	40
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination	98	70
Total Modifications	98	70
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination
Total Modifications