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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value Measurements
Impaired loans with a specific allowance	$ 25,389,000	$ 4,819,000
Specific allowance related to impaired loans	5,113,000	615,000
Collateral dependent impaired loans
Fair Value Measurements
Specific allowance related to impaired loans	4,700,000
Collateral dependent impaired loans
Fair Value Measurements
Impaired loans with a specific allowance	32,200,000	3,000,000.0
Specific allowance related to impaired loans		316,000
Impaired financing receivable charge offs	$ 164,000	$ 207,000

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- Definition

Represents the amount related to charge off of impaired financing receivable during the period.

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No definition available.

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No definition available.

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524

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