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Borrowings - Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Borrowings    
Balance outstanding at year end $ 6,915 $ 8,068
Average daily balance during the year $ 9,272 $ 12,874
Average interest rate during the year 1.37% 1.06%
Maximum month-end balance during the year $ 13,441 $ 16,161
Weighted-average interest rate at year end 1.40% 1.13%