Fair Value Measurement (Fair Value Inputs, Assets, Quantitative Information) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Impaired Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 1,958	$ 2,088
Fair Value Measurements, Valuation Techniques	[1]	Appraisal of collateral
Fair Value Disclosure, Unbservable Input Range	[2]	Appraisal adjustments
Impaired Loan [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 1,958	2,088
Foreclosed Assets Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 516	453
Fair Value Measurements, Valuation Techniques	[1],[3]	Appraisal of collateral
Fair Value Disclosure, Unbservable Input Range	[2]	Appraisal adjustments
Foreclosed Assets Held for Sale [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 516	453
Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 162	174
Fair Value Measurements, Valuation Techniques		Multiple of annual service fee
Fair Value Disclosure, Unbservable Input Range		Estimated prepayment speed based on rate and term
Mortgage Servicing Rights [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 162	$ 174
Unobservable Input - Appraisal Adjustments [Member] | Minimum [Member] | Impaired Loan [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate		10.00%	11.00%
Unobservable Input - Appraisal Adjustments [Member] | Minimum [Member] | Foreclosed Assets Held for Sale [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate		17.00%	17.00%
Unobservable Input - Appraisal Adjustments [Member] | Maximum [Member] | Impaired Loan [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate		60.00%	60.00%
Unobservable Input - Appraisal Adjustments [Member] | Maximum [Member] | Foreclosed Assets Held for Sale [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate		31.00%	27.00%
Unobservable Input - Appraisal Adjustments [Member] | Weighted Average [Member] | Impaired Loan [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate		30.00%	30.00%
Unobservable Input - Appraisal Adjustments [Member] | Weighted Average [Member] | Foreclosed Assets Held for Sale [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate		27.00%	26.00%
Unobservable Input Estimated Prepayment Speed [Member] | Minimum [Member] | Mortgage Servicing Rights [Member] | Multiple of Annual Service [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Prepayment Rate		210.00%	210.00%
Unobservable Input Estimated Prepayment Speed [Member] | Maximum [Member] | Mortgage Servicing Rights [Member] | Multiple of Annual Service [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Prepayment Rate		400.00%	400.00%
Unobservable Input Estimated Prepayment Speed [Member] | Weighted Average [Member] | Mortgage Servicing Rights [Member] | Multiple of Annual Service [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Prepayment Rate		360.00%	360.00%

[1] Fair value is generally determined through independent appraisals of the underlying collateral, which generally includes various level 3 inputs which are not observable.

[2] Appraisals may be adjusted downward by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal. Higher downward adjustments are caused by negative changes to the collateral or conditions in the real estate market, actual offers or sales contracts received, or age of the appraisal.

[3] Includes qualitative adjustments by management and estimated liquidation expenses.