Goodwill and Intangible Assets - Schedule of Reconciliation of Purchase Price Paid for Acquisition and Goodwill Recorded (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022
Less purchase accounting adjustments:
Goodwill	$ 196,461		$ 140,412
Purdum, Gray, Ingledue, Beck, Inc.
Goodwill [Line Items]
Unallocated purchase price	10,145
Less purchase accounting adjustments:
Insurance Company intangible	5,770
Other liabilities	(1,576)
Goodwill, purchase accounting adjustments	4,194
Goodwill	5,951	$ 6,000
Delta Bancshares Company
Goodwill [Line Items]
Unallocated purchase price	29,791
Less purchase accounting adjustments:
Fair value of securities	(2,836)
Fair value of loans, net	(3,399)
Fair value of premises and equipment	3,508
Fair value of time deposits	(1,759)
Fair value of FHLB advances	(75)
Core deposit intangible	5,920
Other assets	(570)
Other liabilities	444
Goodwill, purchase accounting adjustments	1,233
Goodwill	28,558			$ 28,200	$ 28,600
Blackhawk Bancorp, Inc
Goodwill [Line Items]
Unallocated purchase price	26,955
Less purchase accounting adjustments:
Fair value of securities	(25,521)
Fair value of loans, net	(43,477)
Fair value of premises and equipment	(3,856)
Fair value of subordinated and jr subordinated debentures	3,707
Fair value of time deposits	2,311
Increase in core deposit intangible	33,731
Increase in mortgage servicing rights	3,344
Other assets	6,619
Goodwill, purchase accounting adjustments	(23,142)
Goodwill	$ 50,097