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Deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Deposits    
Noninterest-bearing demand $ 2,565,825 $ 2,411,849
Interest-bearing:    
NOW accounts 1,121,292 1,202,752
Money market 2,278,656 2,222,555
Brokered - money market 11,596 101,624
Demand 402,416 411,771
Savings 232,913 218,812
Time 1,300,296 1,313,482
Brokered - time 46,728 95,274
Total deposits $ 7,959,722 $ 7,978,119