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Fair Value of Assets and Liabilities - Significant Assumptions Used in Valuation of Level 3 Financial Instruments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Mortgage Servicing Rights | Level 3 | Minimum | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	9.00%	9.50%
Mortgage Servicing Rights | Level 3 | Maximum | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	11.00%	12.50%
Mortgage Servicing Rights | Level 3 | Weighted Average | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	9.10%	9.70%
Impaired Loans (Collateral Dependent) | Level 3 | Minimum | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	0.00%	0.00%
Impaired Loans (Collateral Dependent) | Level 3 | Maximum | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	40.00%	40.00%
Impaired Loans (Collateral Dependent) | Level 3 | Weighted Average | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	20.00%	20.00%
Foreclosed Assets Held-for-sale | Level 3 | Minimum | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	0.00%	0.00%
Foreclosed Assets Held-for-sale | Level 3 | Maximum | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	40.00%	40.00%
Foreclosed Assets Held-for-sale | Level 3 | Weighted Average | Third Party Valuations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect realizable value	35.00%	35.00%
Fair Value, Nonrecurring | Mortgage Servicing Rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value	$ 899	$ 1,444
Fair Value, Nonrecurring | Impaired Loans (Collateral Dependent)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value	8,358	12,727
Fair Value, Nonrecurring | Foreclosed Assets Held-for-sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value	$ 21	$ 935

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Discount to reflect realizable value used when pricing the investments.

+ References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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