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Fair Value Measurements - Schedule of Assets Measured on Nonrecurring Basis (Details) - Fair Value Measurements Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Cumulative fair value losses	$ 551
Losses recorded in operations during the period
Residential Real Estate [Member]
Cumulative fair value losses	324	$ 330
Losses recorded in operations during the period
Commercial [Member]
Cumulative fair value losses	227
Losses recorded in operations during the period
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Loans receivable, fair value
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Residential Real Estate [Member]
Loans receivable, fair value
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Commercial [Member]
Loans receivable, fair value
Significant Other Observable Inputs (Level 2) [Member]
Loans receivable, fair value
Significant Other Observable Inputs (Level 2) [Member] | Residential Real Estate [Member]
Loans receivable, fair value
Significant Other Observable Inputs (Level 2) [Member] | Commercial [Member]
Loans receivable, fair value
Significant Unobservable Inputs (Level 3) [Member]
Loans receivable, fair value	1,361
Significant Unobservable Inputs (Level 3) [Member] | Residential Real Estate [Member]
Loans receivable, fair value	649	648
Significant Unobservable Inputs (Level 3) [Member] | Commercial [Member]
Loans receivable, fair value	712
Fair Value [Member]
Loans receivable, fair value	1,361
Fair Value [Member] | Residential Real Estate [Member]
Loans receivable, fair value	649	$ 648
Fair Value [Member] | Commercial [Member]
Loans receivable, fair value	$ 712

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- Definition

The cumulative losses on fair value. These can be identified as mark-to-mark adjustments.

+ References

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- Definition

The amount of fair value (mark-to-mark) adjustments recorded in operations during the period.

+ References

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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