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Deposits - Deposit Account Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Banking and Thrift [Abstract]    
Non-interest-bearing checking $ 394,836 $ 387,409
Negotiable orders of withdrawal (NOW) and interest-bearing checking 605,652 573,927
Savings and money market 1,385,593 1,398,345
Certificates of deposit 1,099,465 1,048,552
Total deposits $ 3,485,546 $ 3,408,233