Financing Receivables - Allowance for credit losses (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Loans Receivable		Dec. 31, 2013 Loans Receivable		Mar. 31, 2014 Loans Receivable One-to-four Family Residential		Dec. 31, 2013 Loans Receivable One-to-four Family Residential		Mar. 31, 2014 Loans Receivable Multi-family Residential		Dec. 31, 2013 Loans Receivable Multi-family Residential		Mar. 31, 2014 Loans Receivable Construction		Dec. 31, 2013 Loans Receivable Construction		Mar. 31, 2014 Loans Receivable Commercial		Dec. 31, 2013 Loans Receivable Commercial		Mar. 31, 2014 Loans Receivable Consumer		Dec. 31, 2013 Loans Receivable Consumer		Mar. 31, 2014 Originated Loans Receivable	Dec. 31, 2013 Originated Loans Receivable	Mar. 31, 2014 Originated Loans Receivable One-to-four Family Residential	Dec. 31, 2013 Originated Loans Receivable One-to-four Family Residential	Mar. 31, 2014 Originated Loans Receivable Multi-family Residential	Dec. 31, 2013 Originated Loans Receivable Multi-family Residential	Mar. 31, 2014 Originated Loans Receivable Construction	Dec. 31, 2013 Originated Loans Receivable Construction	Mar. 31, 2014 Originated Loans Receivable Commercial	Dec. 31, 2013 Originated Loans Receivable Commercial	Mar. 31, 2014 Originated Loans Receivable Consumer	Dec. 31, 2013 Originated Loans Receivable Consumer	Mar. 31, 2014 Purchased Loans Receivable	Dec. 31, 2013 Purchased Loans Receivable	Mar. 31, 2014 Purchased Loans Receivable One-to-four Family Residential	Dec. 31, 2013 Purchased Loans Receivable One-to-four Family Residential	Mar. 31, 2014 Purchased Loans Receivable Multi-family Residential	Dec. 31, 2013 Purchased Loans Receivable Multi-family Residential	Mar. 31, 2014 Purchased Loans Receivable Construction	Dec. 31, 2013 Purchased Loans Receivable Construction	Mar. 31, 2014 Purchased Loans Receivable Commercial	Dec. 31, 2013 Purchased Loans Receivable Commercial	Mar. 31, 2014 Purchased Loans Receivable Consumer	Dec. 31, 2013 Purchased Loans Receivable Consumer
Allowance for loan losses:
Beginning balance			$ 1,697		$ 2,160		$ 1,352		$ 1,823		$ 194		$ 172		$ 9		$ 1		$ 131		$ 153		$ 11		$ 11
Provision	200	55	200		1,443		145		1,426		(1)		22		1		8		55		(14)				1
Charge-offs			(170)		(1,937)		(128)		(1,928)										(39)		(8)		(3)		(1)
Recoveries			2		31				31										2
Ending balance			1,729		1,697		1,369		1,352		193		194		10		9		149		131		8		11
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment
Collectively evaluated for impairment																											1,328	1,284	968	939	193	194	10	9	149	131	8	11
Loans acquired with deteriorated credit quality																																							401	413	401	413
Ending balance			336,608		341,215		231,987		236,236		20,010		22,805		7,040		7,141		75,327		72,755		2,244		2,278
Individually evaluated for impairment			100,289	[1]	106,478	[2]	73,434	[1]	77,380	[2]	4,996	[1]	6,535	[2]		[1]		[2]	20,401	[1]	21,055	[2]	1,458	[1]	1,508	[2]
Collectively evaluated for impairment			225,858		223,910		155,648		155,676		13,959		15,214		7,040		7,141		48,425		45,109		786		770
Loans acquired with deteriorated credit quality			$ 10,461		$ 10,827		$ 2,905		$ 3,180		$ 1,055		$ 1,056						$ 6,501		$ 6,591

[1] Includes loans acquired from First Franklin with outstanding balances of $98,158 at March 31, 2014.

[2] Includes loans acquired from First Franklin with outstanding balances of $103,497 at December 31, 2013.