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Deposits (Interest Expense on Deposits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]      
Savings and money market accounts $ 47,069 $ 25,123 $ 11,107
Time certificates of deposit in denominations of $100,000 or more 9,344 4,789 3,016
Other time deposits 7,321 5,755 4,156
Interest expense on deposits $ 63,734 $ 35,667 $ 18,279