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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value Measurements
Impaired loans with a specific allowance	$ 22,878,000		$ 22,878,000		$ 25,389,000
Specific allowance related to impaired loans	4,932,000		4,932,000		$ 5,113,000
Collateral dependent impaired loans
Fair Value Measurements
Impaired loans with a specific allowance	31,200,000	$ 2,900,000	31,200,000	$ 2,900,000
Specific allowance related to impaired loans	4,600,000	200,000	4,600,000	200,000
Impaired financing receivable charge offs	$ 33,000	$ 36,000	$ 69,000	$ 129,000

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- Definition

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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.

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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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