Goodwill and Other Intangible Assets - Current Year Amortization Expense for Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Total intangible amortization	$ 1,539	$ 1,834	$ 3,137	$ 3,729
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Total intangible amortization	1,494	1,789	3,046	3,639
Customer relationship intangible
Finite-Lived Intangible Assets [Line Items]
Total intangible amortization	$ 45	$ 45	$ 91	$ 90