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Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 3,484	$ 3,433
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Constant prepayment rate	7.00%	7.00%
Probability of default	0.00%	0.00%
Discount rate	10.00%	10.00%
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Constant prepayment rate	45.00%	27.00%
Probability of default	100.00%	100.00%
Discount rate	11.50%	11.50%
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Constant prepayment rate	10.00%	9.50%
Probability of default	3.00%	3.00%
Discount rate	10.10%	10.10%
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 2,709	$ 5,506
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member] | Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Marketability discount	1.90%	0.00%
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member] | Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Marketability discount	89.80%	100.00%
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member] | Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Marketability discount	38.50%	33.70%
Other Real Estate Owned [Member] | Market Comparable Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 18,951	$ 4,388
Other Real Estate Owned [Member] | Market Comparable Properties [Member] | Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Comparability adjustments	6.00%	10.00%
Other Real Estate Owned [Member] | Market Comparable Properties [Member] | Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Comparability adjustments	58.60%	100.00%
Other Real Estate Owned [Member] | Market Comparable Properties [Member] | Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Comparability adjustments	15.00%	14.90%

X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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

Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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