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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value Measurements
Impaired loans with a specific allowance	$ 24,078,000		$ 25,389,000
Specific allowance related to impaired loans	5,144,000		$ 5,113,000
Collateral dependent impaired loans
Fair Value Measurements
Impaired loans with a specific allowance	31,800,000	$ 5,800,000
Specific allowance related to impaired loans	4,700,000	200,000
Impaired financing receivable charge offs	$ 23,000	$ 55,000

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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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