Other Intangible Assets - Textual (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets			$ (4,290)	$ (4,564)
Core deposit intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period			6 years 9 months 18 days
Amortization of intangible assets	$ (1,400)	$ (1,500)	$ (4,300)	$ (4,500)
Estimated Future Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2018	1,400		1,400
2019	5,400		5,400
2020	4,900		4,900
2021	4,500		4,500
2022	4,200		4,200
2023 and thereafter	$ 9,600		$ 9,600