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Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned	$ 0	$ 900
Mortgage servicing rights	420	513
Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned		916
Nonrecurring [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned		102
Nonrecurring [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Impaired loans	270
Fair Value, Other real estate owned		814
Nonrecurring [Member] | Land loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned	1
Nonrecurring [Member] | Other investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	3,427
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Impaired loans	0
Fair Value, Other real estate owned		0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Land loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned	0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | One-to-four family residential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Impaired loans	0
Fair Value, Other real estate owned		0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Land loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned	0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Other investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned		$ 916
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Nonresidential real estate loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Impaired loans	270
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Land loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Other real estate owned	1
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 3,400

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+ References

No definition available.

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- Definition

Real estate acquired through foreclosure fair value.

+ References

No definition available.

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+ References

No definition available.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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-SubTopic 50
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-Paragraph 3
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