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Fair Value (Fair Value Measurement and Assumptions) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Assets:      
Impaired Loans   $ 56,826,000 $ 53,267,000
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 $ 24,000 30,000  
Adjustment to fair value in connection with other real estate owned 71,000   710,000
Impaired commercial collateral dependent loans   56,826,000 53,267,000
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months   20,687,000 18,585,000
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months   $ 29,897,000 0
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 8,907,000   2,138,000
Change in net provision, other real estate owned 71,000   710,000
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)      
Assets:      
Impaired Loans 23,404,000   11,210,000
Non-financial assets:      
Other real estate owned 63,000   2,000,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3      
Impaired commercial collateral dependent loans 23,404,000   11,210,000
Measured on a non-recurring basis | Assets/liabilities measured at fair value      
Assets:      
Impaired Loans 23,404,000   11,210,000
Non-financial assets:      
Other real estate owned 63,000   2,000,000
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3      
Impaired commercial collateral dependent loans $ 23,404,000   $ 11,210,000