Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0	$ 0
Net impairment (net recovery)	188,000	64,000	966,000	20,000
Amortization of other intangible assets	6,377,000	4,694,000	$ 18,528,000	13,175,000
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years			8 years 10 months 24 days
Other
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years			7 years 7 months 6 days
Core Deposits and Other
Finite-Lived Intangible Assets [Line Items]
Impairment of core deposits and other intangibles	$ 0	$ 0	$ 0	$ 0