Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deposits
Demand deposits, noninterest-bearing	$ 1,496,671	$ 1,597,421
Interest-bearing transaction deposits	1,238,876	1,166,170
Saving deposits and money market deposits	1,953,859	2,026,212
Time deposits	1,474,506	1,336,162
Total deposits	6,163,912	6,125,965
Brokered interest-bearing transaction deposits	5,000	5,000
Brokered saving deposits and money market deposits	51,000	75,100
Time deposits minimum denomination of $100,000 or more	620,100	578,900
Time deposits minimum denomination of $250,000 or more	217,700	197,900
Brokered time deposits	311,800	247,700
Deposits
July 1, 2018 - June 30, 2019	1,062,338
July 1, 2019 - June 30, 2020	238,719
July 1, 2020 - June 30, 2021	63,516
July 1, 2021 - June 30, 2022	65,582
July 1, 2022 - June 30, 2023	44,289
Thereafter	62
Total	$ 1,474,506	$ 1,336,162