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Allowance for Credit Losses, Credit Quality and Other - Schedule of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 295,856 $ 285,562 $ 285,683 $ 288,234 $ 289,669
Loans charged off (2,001) (3,592) (3,449) (9,077) (12,463)
Recoveries of loans previously charged off 519 614 528 1,717 2,056
Net loans recovered (charged off) (1,482) (2,978) (2,921) (7,360) (10,407)
Provision for credit loss - loans 18,200   2,800 31,700 6,300
Provision for credit loss - loans   5,650     6,300
Ending balance 312,574 288,234 285,562 312,574 285,562
Residential real estate loans          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 51,354 54,884 51,732 55,860 50,963
Loans charged off (42) (77) (103) (260) (192)
Recoveries of loans previously charged off 54 168 22 149 161
Net loans recovered (charged off) 12 91 (81) (111) (31)
Provision for credit loss - loans 8,059   3,233 3,676  
Provision for credit loss - loans   885     3,952
Ending balance 59,425 55,860 54,884 59,425 54,884
Commercial and industrial          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 69,635 92,469 90,474 92,810 89,354
Loans charged off (741) (2,142) (183) (4,500) (7,015)
Recoveries of loans previously charged off 143 208 119 503 375
Net loans recovered (charged off) (598) (1,934) (64) (3,997) (6,640)
Provision for credit loss - loans (8,434)   2,059 (28,210)  
Provision for credit loss - loans   2,275     9,755
Ending balance 60,603 92,810 92,469 60,603 92,469
Consumer & Other          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 29,352 27,014 26,044 27,052 23,261
Loans charged off (1,218) (973) (1,063) (3,072) (3,058)
Recoveries of loans previously charged off 281 212 329 910 900
Net loans recovered (charged off) (937) (761) (734) (2,162) (2,158)
Provision for credit loss - loans 4,058   1,704 7,583  
Provision for credit loss - loans   799     5,911
Ending balance 32,473 27,052 27,014 32,473 27,014
Construction/land development | Commercial real estate loans          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 58,673 32,642 32,275 33,877 32,243
Loans charged off 0 (88) (150) (81) (175)
Recoveries of loans previously charged off 7 10 33 96 103
Net loans recovered (charged off) 7 (78) (117) 15 (72)
Provision for credit loss - loans 4,718   484 29,506  
Provision for credit loss - loans   1,313     471
Ending balance 63,398 33,877 32,642 63,398 32,642
Other Commercial Real Estate | Commercial real estate loans          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 86,842 78,553 85,158 78,635 93,848
Loans charged off 0 (312) (1,950) (1,164) (2,023)
Recoveries of loans previously charged off 34 16 25 59 517
Net loans recovered (charged off) 34 (296) (1,925) (1,105) (1,506)
Provision for credit loss - loans 9,799   (4,680) 19,145  
Provision for credit loss - loans   378     (13,789)
Ending balance $ 96,675 $ 78,635 $ 78,553 $ 96,675 $ 78,553