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Deposits (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Banking and Thrift [Abstract]    
Checking, non-interest bearing $ 376,840 $ 382,259
Checking, interest bearing 617,864 628,579
Savings accounts 1,680,695 1,663,673
Certificates of deposit 424,817 427,816
Total deposits $ 3,100,216 $ 3,102,327
Percentage Change, Checking, non-interest bearing (1.40%)  
Percentage Change, Checking, interest bearing (1.70%)  
Percentage Change, Savings accounts 1.00%  
Percentage Change, Certificates of deposit (0.70%)  
Percentage Change (0.10%)