Loans Receivable, Net - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017		Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - Beginning Balance				$ 5,232	[1]					$ 4,428	$ 5,232	[1]	$ 4,428
Charge-offs											529		1,422
Recoveries											328		731
Provision for loan losses	$ 521	$ (128)	$ (160)	(204)		$ 90		$ 728	$ 643	34	29		1,495	[1],[2],[3]
Allowance for loan losses - Ending Balance	5,060					5,232	[1]				5,060		5,232	[1]
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,699					4,642					4,699		4,642
Allowance for Loan Losses, Individually Evaluated for Impairment	361					590					361		590
Loans, gross	545,552					588,628	[1],[3]				545,552		588,628	[1],[3]
Loans Receivable, Collectively Evaluated for Impairment	530,859					569,063					530,859		569,063
Loans Receivable, Individually Evaluated for Impairment	14,693					19,565					14,693		19,565
One-to-four family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - Beginning Balance				1,697						1,970	1,697		1,970
Charge-offs											106		389
Recoveries											0		113
Provision for loan losses											72		3
Allowance for loan losses - Ending Balance	1,663					1,697					1,663		1,697
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,357					1,602					1,357		1,602
Allowance for Loan Losses, Individually Evaluated for Impairment	306					95					306		95
Loans, gross	134,927					143,653	[1],[2],[4]				134,927		143,653	[1],[2],[4]
Loans Receivable, Collectively Evaluated for Impairment	129,420					139,017	[2]				129,420		139,017	[2]
Loans Receivable, Individually Evaluated for Impairment	5,507					4,636					5,507		4,636
Multifamily
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - Beginning Balance				622						502	622		502
Charge-offs											338		340
Recoveries											0		0
Provision for loan losses											929		460
Allowance for loan losses - Ending Balance	1,213					622					1,213		622
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,207					622					1,207		622
Allowance for Loan Losses, Individually Evaluated for Impairment	6					0					6		0
Loans, gross	88,750					95,580	[1],[2],[4]				88,750		95,580	[1],[2],[4]
Loans Receivable, Collectively Evaluated for Impairment	87,148					93,811	[2]				87,148		93,811	[2]
Loans Receivable, Individually Evaluated for Impairment	1,602					1,769					1,602		1,769
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - Beginning Balance				1,808						1,029	1,808		1,029
Charge-offs											0		0
Recoveries											20		9
Provision for loan losses											(332)		770
Allowance for loan losses - Ending Balance	1,496					1,808					1,496		1,808
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,490					1,787					1,490		1,787
Allowance for Loan Losses, Individually Evaluated for Impairment	6					21					6		21
Loans, gross	242,818					273,400	[1],[2],[4]				242,818		273,400	[1],[2],[4]
Loans Receivable, Collectively Evaluated for Impairment	239,323					267,106	[2]				239,323		267,106	[2]
Loans Receivable, Individually Evaluated for Impairment	3,495					6,294					3,495		6,294
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - Beginning Balance				62						99	62		99
Charge-offs											0		0
Recoveries											0		0
Provision for loan losses											44		(37)
Allowance for loan losses - Ending Balance	106					62					106		62
Allowance for Loan Losses, Collectively Evaluated for Impairment	106					62					106		62
Allowance for Loan Losses, Individually Evaluated for Impairment	0					0					0		0
Loans, gross	4,949					5,000					4,949		5,000
Loans Receivable, Collectively Evaluated for Impairment	4,949					5,000					4,949		5,000
Loans Receivable, Individually Evaluated for Impairment	0					0					0		0
Business
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - Beginning Balance				1,022						813	1,022		813
Charge-offs											0		176
Recoveries											304		578
Provision for loan losses											(753)		(193)
Allowance for loan losses - Ending Balance	573					1,022					573		1,022
Allowance for Loan Losses, Collectively Evaluated for Impairment	532					548					532		548
Allowance for Loan Losses, Individually Evaluated for Impairment	41					474					41		474
Loans, gross	65,114					70,953	[1],[2],[4]				65,114		70,953	[1],[2],[4]
Loans Receivable, Collectively Evaluated for Impairment	61,027					64,087	[2]				61,027		64,087	[2]
Loans Receivable, Individually Evaluated for Impairment	4,087					6,866					4,087		6,866
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - Beginning Balance				$ 21						$ 15	21		15
Charge-offs											85		517
Recoveries											4		31
Provision for loan losses											69		492
Allowance for loan losses - Ending Balance	9					21					9		21
Allowance for Loan Losses, Collectively Evaluated for Impairment	7					21					7		21
Allowance for Loan Losses, Individually Evaluated for Impairment	2					0					2		0
Loans, gross	8,994					42					8,994		42
Loans Receivable, Collectively Evaluated for Impairment	8,992					42					8,992		42
Loans Receivable, Individually Evaluated for Impairment	$ 2					$ 0					$ 2		$ 0

[1] (1) March 31, 2016 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Equity in net loss from subsidiaries was increased and total income was reduced by $1.5 million, interest expense on borrowings and total expense were increased by $66 thousand, and net loss and comprehensive loss were increased $1.6 million. Refer to Notes 1 and 19 for further detail.

[2] (1) March 31, 2015 and 2016 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 19 for further detail.

[3] (1) March 31, 2016 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 19 for further detail.

[4] (1) March 31, 2016 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 19 for further detail.