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Loans Receivable and Allowance for Loan Losses (Loan Portfolio by Pass Rating) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 2,333,263	$ 2,330,018	$ 2,190,677
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	2,235,899	2,256,702
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	41,186	4,736
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	56,178	68,580
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	234,375	244,369	268,137
Commercial & Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,700,113	1,690,836	1,577,816
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	167,224	155,967	101,692
Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	177,340	184,357	177,146
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	53,360	53,667	64,857
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	851	822	$ 1,029
Originated loans [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	234,375	244,369
Originated loans [Member] | Residential [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	232,669	241,237
Originated loans [Member] | Residential [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	724	1,087
Originated loans [Member] | Residential [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	982	2,045
Originated loans [Member] | Commercial & Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,700,113	1,690,836
Originated loans [Member] | Commercial & Multi-family [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,622,917	1,631,838
Originated loans [Member] | Commercial & Multi-family [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	38,464	2,152
Originated loans [Member] | Commercial & Multi-family [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	38,732	56,846
Originated loans [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	167,224	155,967
Originated loans [Member] | Construction [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	164,437	155,967
Originated loans [Member] | Construction [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	2,787
Originated loans [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	177,340	184,357
Originated loans [Member] | Commercial Business [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	162,408	173,833
Originated loans [Member] | Commercial Business [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,998	1,497
Originated loans [Member] | Commercial Business [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	12,934	9,027
Originated loans [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	53,360	53,667
Originated loans [Member] | Home Equity [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	52,617	53,005
Originated loans [Member] | Home Equity [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	743	662
Originated loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	851	822
Originated loans [Member] | Consumer [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 851	$ 822

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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