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Loans Receivable and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Amount	$ 28,228		$ 28,228		$ 28,466
Number of Contracts | loan	0	4	2	9
Pre-Modification Outstanding Recorded Investments		$ 3,571	$ 819	$ 6,726
Post-Modification Outstanding Recorded Investments		$ 3,770	819	$ 7,187
Accrual [Member]
Financing Receivable, Modifications [Line Items]
Amount	$ 20,693		20,693		20,058
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Amount	$ 7,535		$ 7,535		$ 8,408
Originated loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan		1	1	5
Pre-Modification Outstanding Recorded Investments		$ 2,804	$ 640	$ 5,886
Post-Modification Outstanding Recorded Investments		$ 2,851	$ 640	$ 6,164
Originated loans [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan			1	2
Pre-Modification Outstanding Recorded Investments			$ 640	$ 1,445
Post-Modification Outstanding Recorded Investments			$ 640	$ 1,556
Originated loans [Member] | Commercial and Multi-family [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan		1		3
Pre-Modification Outstanding Recorded Investments		$ 2,804		$ 4,441
Post-Modification Outstanding Recorded Investments		$ 2,851		$ 4,608
Acquired loans recorded at fair value [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan		3	1	4
Pre-Modification Outstanding Recorded Investments		$ 767	$ 179	$ 840
Post-Modification Outstanding Recorded Investments		$ 919	$ 179	$ 1,023
Acquired loans recorded at fair value [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan		3	1	4
Pre-Modification Outstanding Recorded Investments		$ 767	$ 179	$ 840
Post-Modification Outstanding Recorded Investments		$ 919	$ 179	$ 1,023

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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