Deposits - Scheduled Maturities of Certificates of Deposit (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Weighted Average Rate
2017 (as a percent)	0.56%
2018 (as a percent)	1.00%
2019 (as a percent)	1.37%
2020 (as a percent)	1.59%
2021 (as a percent)	1.42%
2022 and thereafter (as a percent)	1.64%
Total (as a percent)	1.01%
Balance
2017	$ 675,017
2018	267,346
2019	202,000
2020	283,692
2021	172,014
2022 and thereafter	795
Total	$ 1,600,864	$ 1,994,182
Percent of Total
2017 (as a percent)	42.16%
2018 (as a percent)	16.70%
2019 (as a percent)	12.62%
2020 (as a percent)	17.72%
2021 (as a percent)	10.75%
2022 and thereafter (as a percent)	0.05%
Total (as a percent)	100.00%