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Derivative Financial Instruments - Effect Of Derivatives on Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) resulting from the change in fair value of derivatives $ (52) $ 88 $ 40 $ (89)
Total interest income 30,223 22,694 83,618 60,059
Total interest expense 14,253 8,503 36,772 21,437
Net Interest Income 15,970 14,191 46,846 38,622
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in Other Comprehensive Income 1,366   408  
Total interest income (31) 0 (72) 0
Total interest expense 125 0 140 0
Net Interest Income (156) 0 (212) 0
Interest rate swaps | Loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Total interest income 13 0 30 0
Interest rate swaps | Securities - taxable        
Derivative Instruments, Gain (Loss) [Line Items]        
Total interest income (45) 0 (121) 0
Interest rate swaps | Securities - non-taxable        
Derivative Instruments, Gain (Loss) [Line Items]        
Total interest income 1 0 19 0
Interest rate swaps | Deposits        
Derivative Instruments, Gain (Loss) [Line Items]        
Total interest expense 39 0 39 0
Interest rate swaps | Other borrowed funds        
Derivative Instruments, Gain (Loss) [Line Items]        
Total interest expense $ 86 $ 0 $ 101 $ 0