Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) SecurityLoan	Mar. 31, 2017 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	5	6
Pre-Modification Outstanding Recorded Investment	$ 8,127	$ 1,534
Post-Modification Outstanding Recorded Investment	$ 6,626	$ 1,506
Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 1,002
Post-Modification Outstanding Recorded Investment	$ 0	$ 988
Mortgage Portfolio Segment [Member] \| Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 1,002
Post-Modification Outstanding Recorded Investment	$ 0	$ 988
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	5	1
Pre-Modification Outstanding Recorded Investment	$ 8,127	$ 292
Post-Modification Outstanding Recorded Investment	$ 6,626	$ 284
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 240
Post-Modification Outstanding Recorded Investment	$ 0	$ 234

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

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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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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