Fair Value (Fair Value Measurement and Assumptions) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Assets:
Impaired Loans	$ 33,603,000	$ 38,108,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Charges to allowance for probable loan losses in connection with other real estate owned	0	381,000
Adjustment to fair value in connection with other real estate owned	45,000	2,351,000
Impaired commercial collateral dependent loans	33,603,000	38,108,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	25,157,000	26,162,000
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	2,019,000	6,836,000
Measured on a non-recurring basis
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Change in net provision, impaired loans	913,000	19,699,000
Change in net provision, other real estate owned	45,000	2,351,000
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Impaired Loans	13,168,000	38,794,000
Non-financial assets:
Other real estate owned	251,000	9,445,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Impaired commercial collateral dependent loans	13,168,000	38,794,000
Measured on a non-recurring basis | Assets/liabilities measured at fair value
Assets:
Impaired Loans	13,168,000	38,794,000
Non-financial assets:
Other real estate owned	251,000	9,445,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3
Impaired commercial collateral dependent loans	$ 13,168,000	$ 38,794,000