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Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Deposits    
Noninterest-bearing demand $ 2,468,332 $ 2,411,849
Interest-bearing:    
NOW accounts 1,272,098 1,202,752
Money market 2,209,780 2,222,555
Brokered - money market 9,911 101,624
Demand 354,232 411,771
Savings 200,643 218,812
Time 1,298,626 1,313,482
Brokered - time   95,274
Total deposits $ 7,813,622 $ 7,978,119