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Borrowings - Summary of Short-term Borrowings (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Short-term Debt    
Ending Balance   $ 86,500
FHLB advances    
Short-term Debt    
Ending Balance   86,500
Average Balance $ 74,036 133,834
Maximum Month-End Balance $ 133,725 $ 189,275
Weighted Average Rate for 2.69% 2.05%
Weighted Average Rate at   2.62%