Business Combinations - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 01, 2020
Business Acquisition [Line Items]
Goodwill	$ 346,064	$ 350,298	$ 349,398
Merger-related expenses	29,463	$ 17,450	$ 17,166
Community Financial Holding Co. Inc.
Business Acquisition [Line Items]
Business combination, assets acquired				$ 221,400
Non-PCI loans acquired				110,600
PCI loans acquired				23,400
Business combination, recognized identifiable assets acquired and liabilities assumed, allowance for credit losses				1,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				536
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				219,800
Business combination, deposits				209,300
Goodwill				$ 686
Merger-related expenses	3,500
Interest and fee income, loans, consumer and commercial	$ 5,300