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Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deposits    
Noninterest-bearing demand $ 2,279,633 $ 2,199,483
Interest-bearing:    
NOW accounts 1,004,410 1,252,832
Money market 2,215,455 1,626,218
Brokered - money market 109,788 125,272
Demand 419,303 384,847
Savings 210,316 279,911
Time 1,293,877 1,145,859
Brokered - time 130,665 49,389
Total deposits $ 7,663,447 $ 7,063,811