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Deposits (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Checking, non-interest bearing $ 370,761 $ 356,797
Checking, interest bearing 593,057 600,046
Savings accounts 1,537,672 1,258,506
Certificates of deposit 374,105 395,437
Total deposits $ 2,875,595 $ 2,610,786
Percentage Change, Checking, non-interest bearing 3.90%  
Percentage Change, Checking, interest bearing (1.20%)  
Percentage Change, Savings accounts 22.20%  
Percentage Change, Certificates of deposit (5.40%)  
Percentage Change 10.10%