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Derivative Financial Instruments (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
agreement
Dec. 31, 2018
USD ($)
agreement
Swap agreements    
Derivative Financial Instruments    
Number of swap agreements outstanding not included in the offsetting | agreement 14 8
Collateralized amount $ 6,100 $ 1,600
Receive Fixed/Pay Variable Swaps    
Derivative Financial Instruments    
Notional Amount 70,606 47,381
Fair Value, Liability (5,611) (1,705)
Pay Fixed/Receive Variable Swaps    
Derivative Financial Instruments    
Notional Amount 70,606 47,381
Fair Value, Asset $ 5,611 $ 1,705