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Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Deposits    
Noninterest-bearing demand $ 2,525,677 $ 2,411,849
Interest-bearing:    
NOW accounts 1,256,547 1,202,752
Money market 2,559,451 2,222,555
Brokered - money market 11,547 101,624
Demand 407,059 411,771
Savings 184,869 218,812
Time 1,345,083 1,313,482
Brokered - time   95,274
Total deposits $ 8,290,233 $ 7,978,119