Goodwill and Other Intangible Assets (Details 2) $ in Thousands	Dec. 31, 2017 USD ($)
Estimated amortization expense of finite-lived intangible assets for future periods
2018	$ 6,261
2019	5,343
2020	4,317
2021	3,238
2022	2,318
Core deposit intangible
Estimated amortization expense of finite-lived intangible assets for future periods
2018	6,130
2019	5,212
2020	4,186
2021	3,107
2022	2,187
Customer relationship intangible
Estimated amortization expense of finite-lived intangible assets for future periods
2018	131
2019	131
2020	131
2021	131
2022	$ 131