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Segment Reporting (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Net interest income $ 519,327 $ 481,298 $ 424,001
Provision for (recovery of) credit losses on loans 15,593 23,871 (2,168)
Noninterest income 113,075 149,253 226,984
Noninterest expense 439,622 395,372 430,326
Income before income taxes 177,187 211,308 222,827
Income taxes 32,509 45,240 46,935
Net income (loss) 144,678 166,068 175,892
Total assets 17,360,535 16,988,176 16,810,311
Goodwill 991,665 991,708 939,683
Community Banks      
Segment Reporting Information [Line Items]      
Goodwill 988,898 988,941 936,916
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 544,508 498,673 437,435
Provision for (recovery of) credit losses on loans 15,593 23,871 (2,168)
Noninterest income 76,130 114,263 195,214
Noninterest expense 409,849 366,684 404,566
Income before income taxes 195,196 222,381 230,251
Income taxes 38,597 50,425 50,749
Net income (loss) 156,599 171,956 179,502
Total assets 17,313,704 16,882,534 16,694,710
Goodwill 988,898 988,941 936,916
Operating Segments | Insurance      
Segment Reporting Information [Line Items]      
Net interest income 1,653 619 454
Provision for (recovery of) credit losses on loans 0 0 0
Noninterest income 12,578 11,821 11,370
Noninterest expense 8,652 8,442 8,060
Income before income taxes 5,579 3,998 3,764
Income taxes 1,452 1,046 981
Net income (loss) 4,127 2,952 2,783
Total assets 40,405 37,567 33,544
Goodwill 2,767 2,767 2,767
Operating Segments | Wealth Management      
Segment Reporting Information [Line Items]      
Net interest income 34 2,793 1,657
Provision for (recovery of) credit losses on loans 0 0 0
Noninterest income 25,311 24,839 22,185
Noninterest expense 19,596 18,664 16,475
Income before income taxes 5,749 8,968 7,367
Income taxes 37 0 0
Net income (loss) 5,712 8,968 7,367
Total assets 6,590 75,383 65,015
Goodwill 0 0 0
Other      
Segment Reporting Information [Line Items]      
Net interest income (26,868) (20,787) (15,545)
Provision for (recovery of) credit losses on loans 0 0 0
Noninterest income (944) (1,670) (1,785)
Noninterest expense 1,525 1,582 1,225
Income before income taxes (29,337) (24,039) (18,555)
Income taxes (7,577) (6,231) (4,795)
Net income (loss) (21,760) (17,808) (13,760)
Total assets (164) (7,308) 17,042
Goodwill $ 0 $ 0 $ 0