Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 481,298	$ 424,001	$ 426,797
Provision for credit losses	23,788	(1,668)	86,850
Noninterest income	149,253	226,984	235,532
Noninterest expense	395,455	429,826	471,988
Income before income taxes	211,308	222,827	103,491
Income taxes	45,240	46,935	19,840
Net income (loss)	166,068	175,892	83,651
Total assets	16,988,176	16,810,311	14,929,612
Goodwill	991,708	939,683	939,683
Community Banks
Segment Reporting Information [Line Items]
Goodwill	988,941	936,916	936,916
Insurance
Segment Reporting Information [Line Items]
Goodwill	2,767	2,767	2,767
Operating Segments | Community Banks
Segment Reporting Information [Line Items]
Net interest income	498,673	437,435	437,101
Provision for credit losses	23,788	(1,668)	86,850
Noninterest income	114,263	195,214	208,721
Noninterest expense	366,767	404,066	448,475
Income before income taxes	222,381	230,251	110,497
Income taxes	50,425	50,749	22,892
Net income (loss)	171,956	179,502	87,605
Total assets	16,882,534	16,694,710	14,814,726
Goodwill	988,941	936,916	936,916
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Net interest income	619	454	566
Provision for credit losses	0	0	0
Noninterest income	11,821	11,370	10,403
Noninterest expense	8,442	8,060	7,751
Income before income taxes	3,998	3,764	3,218
Income taxes	1,046	981	837
Net income (loss)	2,952	2,783	2,381
Total assets	37,567	33,544	30,375
Goodwill	2,767	2,767	2,767
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Net interest income	2,793	1,657	1,658
Provision for credit losses	0	0	0
Noninterest income	24,839	22,185	18,061
Noninterest expense	18,664	16,475	14,940
Income before income taxes	8,968	7,367	4,779
Income taxes	0	0	0
Net income (loss)	8,968	7,367	4,779
Total assets	75,383	65,015	71,266
Goodwill	0	0	0
Other
Segment Reporting Information [Line Items]
Net interest income	(20,787)	(15,545)	(12,528)
Provision for credit losses	0	0	0
Noninterest income	(1,670)	(1,785)	(1,653)
Noninterest expense	1,582	1,225	822
Income before income taxes	(24,039)	(18,555)	(15,003)
Income taxes	(6,231)	(4,795)	(3,889)
Net income (loss)	(17,808)	(13,760)	(11,114)
Total assets	(7,308)	17,042	13,245
Goodwill	$ 0	$ 0	$ 0