Loans Receivable - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable Credit Quality Indicators
Total loans	$ 1,170,796	$ 1,183,147
One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	164,124	180,337
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	119,785	131,991
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	44,339	48,346
Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	478,057	480,349
Multi Family Mortgage Loans without wholesale [Member] [Member]
Financing Receivable Credit Quality Indicators
Total loans	320,155	345,111
Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	157,902	135,238
Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	223,528	234,500
Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	31	60
Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,291	1,825
Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	22,732	11,946
Commercial loans - Unsecured [Member]
Financing Receivable Credit Quality Indicators
Total loans	3,206	1,885
Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,599	2,213
Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans	16,369	11,296
Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	19,995	24,127
Aviation (Member) [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,021	1,108
Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	15,294	14,307
Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	157,893	160,208
Commercial Leases - Below Investment Grade [Member]
Financing Receivable Credit Quality Indicators
Total loans	7,336	11,309
Commercial Leases - Non Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	46,175	35,473
Commercial Leases - Lease Pools [Member]
Financing Receivable Credit Quality Indicators
Total loans	10,218	10,153
Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,927	2,051
Nonaccrual [Member]
Financing Receivable Credit Quality Indicators
Total loans	6,288	12,267
Nonaccrual [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	2,114	4,228
Nonaccrual [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	411	198
Nonaccrual [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,404	4,515
Nonaccrual [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	2,284	3,247
Nonaccrual [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	75	76
Nonaccrual [Member] | Commercial loans - Unsecured [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Leases - Below Investment Grade [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Leases - Non Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Commercial Leases - Lease Pools [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Nonaccrual [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	3
Substandard [Member]
Financing Receivable Credit Quality Indicators
Total loans	13,464	13,975
Substandard [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	429	1,046
Substandard [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	964
Substandard [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	5,741	3,430
Substandard [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	513	519
Substandard [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	5,259	6,698
Substandard [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	819	613
Substandard [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	148	7
Substandard [Member] | Commercial loans - Unsecured [Member]
Financing Receivable Credit Quality Indicators
Total loans	555	698
Substandard [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Leases - Below Investment Grade [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Leases - Non Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Commercial Leases - Lease Pools [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Substandard [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Pass [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,132,300	1,153,540
Pass [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	117,242	126,102
Pass [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	43,705	46,253
Pass [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	312,554	336,557
Pass [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	157,389	134,719
Pass [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	197,920	223,385
Pass [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	31	60
Pass [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	472	1,212
Pass [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	22,509	11,863
Pass [Member] | Commercial loans - Unsecured [Member]
Financing Receivable Credit Quality Indicators
Total loans	2,651	1,147
Pass [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,599	2,213
Pass [Member] | Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans	16,369	11,296
Pass [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	19,995	24,127
Pass [Member] | Aviation (Member) [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,021	1,108
Pass [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	15,294	14,307
Pass [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	157,893	160,208
Pass [Member] | Commercial Leases - Below Investment Grade [Member]
Financing Receivable Credit Quality Indicators
Total loans	7,336	11,309
Pass [Member] | Commercial Leases - Non Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	46,175	35,473
Pass [Member] | Commercial Leases - Lease Pools [Member]
Financing Receivable Credit Quality Indicators
Total loans	10,218	10,153
Pass [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	1,927	2,048
Special Mention [Member]
Financing Receivable Credit Quality Indicators
Total loans	18,744	3,365
Special Mention [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	615
Special Mention [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	223	931
Special Mention [Member] | Multi-family mortgage loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	456	609
Special Mention [Member] | Wholesale commercial lending [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Nonresidential Real Estate Loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	18,065	1,170
Special Mention [Member] | Construction loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Land loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial loans - Secured [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial loans - Unsecured [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	40
Special Mention [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial Loans - Warehouse Lines [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial Loans - Health Care [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial loans - other [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial Leases - Investment Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial Leases - Below Investment Grade [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial Leases - Non Rated [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Commercial Leases - Lease Pools [Member]
Financing Receivable Credit Quality Indicators
Total loans	0	0
Special Mention [Member] | Consumer loans [Member]
Financing Receivable Credit Quality Indicators
Total loans	$ 0	$ 0