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Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	$ 5,103	$ 4,940
Recorded investment, loans not past due	1,169,625	1,326,254
Recorded investment, total	1,174,728	1,331,194
One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	1,624	3,189
Recorded investment, loans not past due	43,365	54,155
Recorded investment, total	44,989	57,344
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	295	480
Recorded investment, loans not past due	10,466	12,547
Recorded investment, total	10,761	13,027
Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	1,283	461
Recorded investment, loans not past due	246,680	278,776
Recorded investment, total	247,963	279,237
Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded investment, loans not past due	315,787	340,633
Recorded investment, total	315,787	340,633
Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	288	270
Recorded investment, loans not past due	134,386	152,172
Recorded investment, total	134,674	152,442
Land loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
Recorded investment, loans not past due		172
Recorded investment, total		172
Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Recorded investment, loans not past due	24,853	39,574
Recorded investment, total	24,853	39,574
Commercial loans - Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Commercial Loans - Municipal loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
Commercial Loans - Warehouse Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, loans not past due	50,431	62,489
Recorded investment, total	50,431	62,489
Commercial Loans - Health Care [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, loans not past due	70,430	85,343
Recorded investment, total	70,430	85,343
Commercial Leases - Investment rated commercial leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	873	498
Recorded investment, loans not past due	132,966	165,711
Recorded investment, total	133,839	166,209
Commercial Leases - Below Investment Grade [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	679	0
Recorded investment, loans not past due	138,111	133,185
Recorded investment, total	138,790	133,185
Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	61	42
Recorded investment, loans not past due	2,150	1,497
Recorded investment, total	2,211	1,539
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	3,431	2,774
30-59 Days Past Due [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	777	1,383
30-59 Days Past Due [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	280	393
30-59 Days Past Due [Member] | Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	981	461
30-59 Days Past Due [Member] | Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
30-59 Days Past Due [Member] | Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
30-59 Days Past Due [Member] | Land loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
30-59 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
30-59 Days Past Due [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
30-59 Days Past Due [Member] | Commercial Loans - Warehouse Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
30-59 Days Past Due [Member] | Commercial Leases - Investment rated commercial leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	826	498
30-59 Days Past Due [Member] | Commercial Leases - Below Investment Grade [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	543	0
30-59 Days Past Due [Member] | Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	24	39
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	830	919
60-89 Days Past Due [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	340	638
60-89 Days Past Due [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	15	8
60-89 Days Past Due [Member] | Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	302	0
60-89 Days Past Due [Member] | Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
60-89 Days Past Due [Member] | Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	270
60-89 Days Past Due [Member] | Land loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
60-89 Days Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
60-89 Days Past Due [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
60-89 Days Past Due [Member] | Commercial Loans - Warehouse Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
60-89 Days Past Due [Member] | Commercial loans - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	136	0
60-89 Days Past Due [Member] | Commercial Leases - Investment rated commercial leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
60-89 Days Past Due [Member] | Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	37	3
90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	842	1,247
90 Days or Greater Past Due [Member] | One-to-four family residential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	507	1,168
90 Days or Greater Past Due [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	79
90 Days or Greater Past Due [Member] | Multi-family mortgage loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
90 Days or Greater Past Due [Member] | Wholesale commercial lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
90 Days or Greater Past Due [Member] | Nonresidential real estate loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	288	0
90 Days or Greater Past Due [Member] | Land loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due		0
90 Days or Greater Past Due [Member] | Commercial loans - Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
90 Days or Greater Past Due [Member] | Commercial Loans - Municipal loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
90 Days or Greater Past Due [Member] | Commercial Loans - Warehouse Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
90 Days or Greater Past Due [Member] | Commercial loans - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	0	0
90 Days or Greater Past Due [Member] | Commercial Leases - Investment rated commercial leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	47	0
90 Days or Greater Past Due [Member] | Consumer loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment, Total Past Due	$ 0	$ 0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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