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Deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Savings $ 1,100,435 $ 1,083,012
Money market 1,549,998 1,532,024
NOW 2,000,258 2,011,334
Non-interest bearing 1,440,618 1,452,987
Certificates of deposit 665,274 634,809
Total deposits $ 6,756,583 $ 6,714,166