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Loans Receivable and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan
Financing Receivable, Modifications [Line Items]
Total recorded investment in TDRs	$ 16,063	$ 17,732
Number of Contracts | loan	9	7
Pre-Modification Outstanding Recorded Investments	$ 1,205	$ 1,930
Post-Modification Outstanding Recorded Investments	1,128	2,182
Accrual Status [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment in TDRs	13,760	17,030
Non-Accrual Status [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment in TDRs	$ 2,303	$ 702
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	3	1
Pre-Modification Outstanding Recorded Investments	$ 615	$ 181
Post-Modification Outstanding Recorded Investments	$ 580	$ 186
Commercial and Multi-family [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan		2
Pre-Modification Outstanding Recorded Investments		$ 1,022
Post-Modification Outstanding Recorded Investments		$ 1,194
Commercial Business [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	3	2
Pre-Modification Outstanding Recorded Investments	$ 428	$ 528
Post-Modification Outstanding Recorded Investments	$ 387	$ 567
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	3	1
Pre-Modification Outstanding Recorded Investments	$ 162	$ 99
Post-Modification Outstanding Recorded Investments	$ 161	$ 130
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan		1
Pre-Modification Outstanding Recorded Investments		$ 100
Post-Modification Outstanding Recorded Investments		$ 105

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

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