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Deposits and Related Interest (Narratives) (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Deposits [Abstract]    
Weighted Average Rate Domestic Deposit 0.74% 0.67%
Time Deposits, $250,000 or More $ 338,500,000 $ 346,000,000
Public Fund Time Deposits, $250,000 or more $ 14,100,000 $ 19,600,000
Public Fund Time Deposits Weighted Average Rate, $250,000 or more 127.00% 116.40%
Public funds deposit $ 228,800,000 $ 207,400,000
Public Fund Collateral Investments 278,200,000 281,200,000
Accrued Interest, Time Deposits 2,200,000  
Bank Overdrafts 578,000 1,100,000
Brokered Certificates of Deposits 430,200,000 500,800,000
Brokered Money Market Deposit $ 21,000,000 $ 24,300,000