Other Intangible Assets - Textual (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ (1,438)	$ (1,513)
Core deposit intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	7 years 3 months 19 days
Amortization of intangible assets	$ (1,400)	$ (1,500)
Estimated Future Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2018	4,300
2019	5,400
2020	4,900
2021	4,500
2022	4,200
2023 and thereafter	$ 9,500