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Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Mortgage Servicing Rights [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Constant prepayment rate	0.00%	6.10%
Probability of default	0.00%	0.00%
Discount rate	10.00%	10.00%
Mortgage Servicing Rights [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Constant prepayment rate	25.70%	22.40%
Probability of default	100.00%	100.00%
Discount rate	11.50%	11.50%
Mortgage Servicing Rights [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Constant prepayment rate	11.10%	10.00%
Probability of default	2.80%	2.60%
Discount rate	10.10%	10.10%
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 2,908	$ 3,236
Impaired Loans (Collateral Dependent) [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Marketability discount	0.00%	0.00%
Impaired Loans (Collateral Dependent) [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Marketability discount	82.50%	76.70%
Impaired Loans (Collateral Dependent) [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Marketability discount	28.40%	26.80%
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 4,516	$ 3,192
Other Real Estate/Asset Owned [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Comparability adjustments	10.00%	5.00%
Other Real Estate/Asset Owned [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Comparability adjustments	100.00%	51.80%
Other Real Estate/Asset Owned [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Comparability adjustments	25.00%	11.70%
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 374	$ 6,798

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=36462937&loc=d3e19207-110258

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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=36462937&loc=d3e19207-110258

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- Definition

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=36462937&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=36462937&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=36462937&loc=d3e19207-110258

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- Definition

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=36462937&loc=d3e19207-110258

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