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Disclosures about Fair Value of Assets and Liabilities - Other Assets Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Significant Unobservable Inputs (Level 3) | Collateral dependent loans
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 11,008	$ 13,123
Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	12,875	12,472
Fair Value, Nonrecurring | Collateral dependent loans
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	11,008	13,123
Fair Value, Nonrecurring | Mortgage servicing rights
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	12,875	12,472
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	0	0
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	0	0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral dependent loans
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	0	0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) | Mortgage servicing rights
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	0	0
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral dependent loans
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	11,008	13,123
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value	$ 12,875	$ 12,472

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- Definition

Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]

+ References

No definition available.

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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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