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Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value | $ 1,528 | $ 1,173
Mortgage servicing rights | 3,390 | 3,607
Impaired loans (collateral dependent) | 1,078 | 747
Other real estate owned | $ 2,345 | $ 6,500
Conversion Rate [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 1.6298 |
Dividend Rate [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.4074 |
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.0800 | 0.080
Mortgage servicing rights, measurement input | 0.100 | 0.100
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.1200 | 0.120
Mortgage servicing rights, measurement input | 0.115 | 0.115
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.1000 | 0.100
Mortgage servicing rights, measurement input | 0.101 | 0.101
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input, conversion date | Dec. 31, 2024 | Dec. 31, 2024
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input, conversion date | Dec. 31, 2022 | Dec. 31, 2022
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input, conversion date | Dec. 31, 2026 | Dec. 31, 2026
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.070 | 0.070
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.218 | 0.281
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.105 | 0.095
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.000 | 0.000
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 1.000 | 1.000
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.028 | 0.026
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Impaired loans (collateral dependent), measurement input | 0.000 | 0.000
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Impaired loans (collateral dependent), measurement input | 0.963 | 0.951
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Impaired loans (collateral dependent), measurement input | 0.456 | 0.415
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Other real estate owned, measurement input | 0.100 | 0.060
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Other real estate owned, measurement input | 0.552 | 0.476
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Other real estate owned, measurement input | 0.149 | 0.149

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- Definition The conversion date used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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- Definition This element represents the fair value disclosure of impaired loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + 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 (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + 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 (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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