Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Net impairment (net recovery)	$ 669,000	$ 107,000	$ 778,000	$ 83,000
Goodwill impairment	0	0	0	0
Amortization of other intangible assets	6,681,000	4,170,000	$ 12,151,000	8,481,000
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