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Deposits and Related Interest (Narratives) (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Deposits [Abstract]    
Weighted Average Rate Domestic Deposit 0.67% 0.65%
Time Deposits, $250,000 or More $ 346,000,000 $ 359,600,000
Public Fund Time Deposits, $250,000 or more $ 19,600,000 $ 3,500,000
Public Fund Time Deposits Weighted Average Rate, $250,000 or more 116.40% 0.28%
Public funds deposit $ 207,400,000 $ 153,100,000
Public Fund Collateral Investments 281,200,000 173,000,000
Accrued Interest, Time Deposits 3,100,000  
Bank Overdrafts 1,100 2,200,000
Brokered Certificates of Deposits 500,800,000 471,600,000
Brokered Money Market Deposit $ 24,300,000 $ 46,900,000