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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value Measurements
Impaired loans with a specific allowance	$ 6,233,000		$ 6,385,000
Specific allowance related to impaired loans	1,039,000		$ 1,194,000
Collateral dependent impaired loans
Fair Value Measurements
Impaired loans with a specific allowance	3,800,000	$ 3,800,000
Specific allowance related to impaired loans	702,000	1,000,000
Impaired financing receivable charge offs	$ 0	$ 57,000

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- Definition

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

+ References

No definition available.

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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.

+ References

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=84173941&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=84173941&loc=SL6953550-111524

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