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Borrowings Repurchase Agreements and Other Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt [Line Items]      
Securities Sold Under Agreements to Repurchase Weighted Average Rate 0.15%    
Securities Sold under Agreements to Repurchase $ 192,330 $ 155,388  
Securities Sold under Agreements to Repurchase Increase (Decrease) 36,900    
Securities Sold under Agreements to Repurchase [Member]      
Short-term Debt [Line Items]      
Maximum outstanding at any month-end 192,330 163,626 $ 185,763
Average amount outstanding for the year $ 140,622 $ 144,674 $ 129,734