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Deposits - Deposit Account Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Non-interest-bearing demand $ 380,681 $ 395,375
Interest-bearing negotiable orders of withdrawal (NOW) 529,610 458,012
Savings and money market 1,400,522 1,336,229
Certificates of deposit 1,064,392 1,096,896
Total deposits $ 3,375,205 $ 3,286,512