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Loans and Leases and the Allowance for Credit Losses - Changes in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 1,975,110 $ 1,472,359 $ 1,925,331 $ 1,469,226
Allowance on acquired PCD loans   99,000   99,000
Provision for credit losses 150,000 302,000 270,000 312,000
Net charge-offs        
Charge-offs (162,224) (75,614) (257,163) (126,652)
Recoveries 35,480 26,045 60,198 70,216
Net (charge-offs) recoveries (126,744) (49,569) (196,965) (56,436)
Ending balance 1,998,366 1,823,790 1,998,366 1,823,790
Commercial, Financial, Leasing, etc. [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 504,779 307,055 502,153 283,899
Allowance on acquired PCD loans   41,003   41,003
Provision for credit losses 11,977 95,917 24,164 124,642
Net charge-offs        
Charge-offs (21,258) (37,925) (40,260) (57,159)
Recoveries 16,431 8,423 25,872 22,088
Net (charge-offs) recoveries (4,827) (29,502) (14,388) (35,071)
Ending balance 511,929 414,473 511,929 414,473
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 743,621 539,444 676,684 557,239
Allowance on acquired PCD loans   55,812   55,812
Provision for credit losses 121,092 120,277 217,084 89,339
Net charge-offs        
Charge-offs (101,589) (8,796) (131,974) (10,596)
Recoveries 2,552 1,656 3,882 16,599
Net (charge-offs) recoveries (99,037) (7,140) (128,092) 6,003
Ending balance 765,676 708,393 765,676 708,393
Residential [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 113,192 72,581 115,092 71,726
Allowance on acquired PCD loans   1,833   1,833
Provision for credit losses 3,957 50,168 2,435 51,888
Net charge-offs        
Charge-offs (1,072) (2,863) (2,773) (6,835)
Recoveries 2,315 2,607 3,638 5,714
Net (charge-offs) recoveries 1,243 (256) 865 (1,121)
Ending balance 118,392 124,326 118,392 124,326
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 613,518 553,279 631,402 556,362
Allowance on acquired PCD loans   352   352
Provision for credit losses 12,974 35,638 26,317 46,131
Net charge-offs        
Charge-offs (38,305) (26,030) (82,156) (52,062)
Recoveries 14,182 13,359 26,806 25,815
Net (charge-offs) recoveries (24,123) (12,671) (55,350) (26,247)
Ending balance $ 602,369 $ 576,598 $ 602,369 $ 576,598