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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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- Definition Real estate acquired through foreclosure fair value. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 + Details
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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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