Fair Value (Fair Value Measurement and Assumptions) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Assets:
Impaired Loans	$ 28,621,000	$ 28,621,000	$ 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	30,000
Adjustment to fair value in connection with other real estate owned	13,000	330,000
Impaired commercial collateral dependent loans	28,621,000	28,621,000	38,108,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months	12,571,000	12,571,000	26,162,000
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months	2,133,000	2,133,000	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	1,681,000	1,681,000	19,699,000
Change in net provision, other real estate owned	330,000	330,000	2,351,000
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Impaired Loans	12,452,000	12,452,000	38,794,000
Non-financial assets:
Other real estate owned	238,000	238,000	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	12,452,000	12,452,000	38,794,000
Measured on a non-recurring basis | Assets/liabilities measured at fair value
Assets:
Impaired Loans	12,452,000	12,452,000	38,794,000
Non-financial assets:
Other real estate owned	238,000	238,000	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	$ 12,452,000	$ 12,452,000	$ 38,794,000