Goodwill, Core Deposit Intangible and Other Intangible Assets - Estimated Amortization Expense for Core Deposit Intangible, Customer Relationship Intangible and Other Intangible Assets Recognized (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2018	$ 1,807
2019	6,945
2020	6,477
2021	6,026
2022	5,578
Thereafter	8,415
Total	$ 35,248

Goodwill, Core Deposit Intangible and Other Intangible Assets - Estimated Amortization Expense for Core Deposit Intangible, Customer Relationship Intangible and Other Intangible Assets Recognized (Details)
$ in Thousands

Sep. 30, 2018

USD ($)

Goodwill And Intangible Assets Disclosure [Abstract]

$ 1,807

6,945

6,477

6,026

5,578

8,415

$ 35,248