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Fair Value (Fair Value Measurement and Assumptions) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets:      
Impaired Loans $ 2,955,000 $ 14,306,000  
Non-financial assets:      
Other real estate owned 71,103,000 57,344,000  
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 9,611,000 170,000 $ 30,000
Adjustment to fair value in connection with other real estate owned 322,000 3,071,000 $ 710,000
Impaired commercial collateral dependent loans 2,955,000 14,306,000  
Impaired commercial collateral dependent receivables appraisals to determine fair value within immediately preceding twelve months 1,426,000 10,911,000  
Impaired collateral dependent commercial loans with internal evaluation completed within last twelve months 847,000 0  
Measured on a non-recurring basis      
Assets:      
Equity investments without readily determinable fair values 28,166,000    
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3      
Change in net provision, impaired loans 43,000 356,000  
Change in net provision, other real estate owned 322,000 3,071,000  
Change in net provision, equity investment without readily determinable fair value 4,775,000    
Measured on a non-recurring basis | Significant Unobservable Inputs (Level 3)      
Assets:      
Impaired Loans 826,000 1,563,000  
Equity investments without readily determinable fair values 28,166,000    
Non-financial assets:      
Other real estate owned 21,614,000 38,871,000  
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3      
Impaired commercial collateral dependent loans 826,000 1,563,000  
Measured on a non-recurring basis | Assets/liabilities measured at fair value      
Assets:      
Impaired Loans 826,000 1,563,000  
Non-financial assets:      
Other real estate owned 21,614,000 38,871,000  
Assumptions used in discounted cash flow model to determine fair value of investments classified within level 3      
Impaired commercial collateral dependent loans $ 826,000 $ 1,563,000