Loans and Allowance - Information regarding newly restructured troubled debt by type of modification (Details 8) (Loans Receivable, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only	$ 87
Term	705	342
Combination	5,365	2,907
Total Modifications	6,157	3,249
Construction/Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only	87
Term	113	138
Combination	1,779	2,265
Total Modifications	1,979	2,403
One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term	592	204
Combination	2,130	573
Total Modifications	2,722	777
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination	1,014
Total Modifications	1,014
Nonresidential and agricultural land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination	176
Total Modifications	176
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination	258	69
Total Modifications	258	69
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Only
Term
Combination	8
Total Modifications	$ 8