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Segment Reporting - Financial Information for Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financial information for the Company's operating segments                  
Net interest income (loss) $ 130,998     $ 127,383     $ 379,314 $ 393,374  
Provision for credit losses 935     4,615     6,673 13,075  
Noninterest income (loss) 89,299     38,200     169,442 92,719  
Noninterest expense 121,983     108,369     346,871 327,742  
Income (loss) before income taxes 97,379     52,599     195,212 145,276  
Income tax expense (benefit) 24,924     10,766     44,502 28,722  
Net income (loss) 72,455 $ 38,846 $ 39,409 41,833 $ 28,643 $ 46,078 150,710 116,554  
Total assets 17,958,840     17,181,621     17,958,840 17,181,621 $ 17,360,535
Goodwill 988,898     991,665     988,898 991,665 991,665
Community Banks                  
Financial information for the Company's operating segments                  
Goodwill 988,898           988,898   988,898
Insurance                  
Financial information for the Company's operating segments                  
Goodwill 0           0   $ 2,767
Operating segments | Community Banks                  
Financial information for the Company's operating segments                  
Net interest income (loss) 137,860     133,901     398,970 412,070  
Provision for credit losses 935     4,615     6,673 13,075  
Noninterest income (loss) 83,244     28,956     145,179 66,895  
Noninterest expense 117,035     100,902     327,541 306,666  
Income (loss) before income taxes 103,134     57,340     209,935 159,224  
Income tax expense (benefit) 26,867     12,339     49,507 33,305  
Net income (loss) 76,267     45,001     160,428 125,919  
Total assets 17,959,839     17,143,564     17,959,839 17,143,564  
Goodwill 988,898     988,898     988,898 988,898  
Operating segments | Insurance                  
Financial information for the Company's operating segments                  
Net interest income (loss)       456     942 1,170  
Provision for credit losses       0     0 0  
Noninterest income (loss)       3,276     6,473 9,497  
Noninterest expense       2,237     4,392 6,346  
Income (loss) before income taxes       1,495     3,023 4,321  
Income tax expense (benefit)       387     785 1,119  
Net income (loss)       1,108     2,238 3,202  
Total assets 0     39,434     0 39,434  
Goodwill 0     2,767     0 2,767  
Operating segments | Wealth Management                  
Financial information for the Company's operating segments                  
Net interest income (loss) 15     16     47 52  
Provision for credit losses 0     0     0 0  
Noninterest income (loss) 6,447     6,361     18,933 17,524  
Noninterest expense 4,511     4,739     13,725 13,473  
Income (loss) before income taxes 1,951     1,638     5,255 4,103  
Income tax expense (benefit) 47     72     147 72  
Net income (loss) 1,904     1,566     5,108 4,031  
Total assets 1,163     5,077     1,163 5,077  
Goodwill 0     0     0 0  
Other                  
Financial information for the Company's operating segments                  
Net interest income (loss) (6,877)     (6,990)     (20,645) (19,918)  
Provision for credit losses 0     0     0 0  
Noninterest income (loss) (392)     (393)     (1,143) (1,197)  
Noninterest expense 437     491     1,213 1,257  
Income (loss) before income taxes (7,706)     (7,874)     (23,001) (22,372)  
Income tax expense (benefit) (1,990)     (2,032)     (5,937) (5,774)  
Net income (loss) (5,716)     (5,842)     (17,064) (16,598)  
Total assets (2,162)     (6,454)     (2,162) (6,454)  
Goodwill $ 0     $ 0     $ 0 $ 0