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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities - available-for-sale $ 3,270,620 $ 3,507,841
Investment securities - held-to-maturity 1,194,455 1,170,481
Fair Value, Inputs, Level 1 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,017,677 1,000,213
Federal funds sold 6,425 5,100
Accrued interest receivable 118,871 118,966
Marketable equity securities 51,540 49,419
Demand and non-interest bearing 3,937,168 4,085,501
Savings and interest-bearing transaction accounts 10,966,426 11,050,347
Securities sold under agreements to repurchase 179,416 142,085
Accrued interest payable 39,897 19,124
Fair Value, Inputs, Level 1 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,017,677 1,000,213
Federal funds sold 6,425 5,100
Accrued interest receivable 118,871 118,966
Marketable equity securities 51,540 49,419
Demand and non-interest bearing 3,937,168 4,085,501
Savings and interest-bearing transaction accounts 10,966,426 11,050,347
Securities sold under agreements to repurchase 179,416 142,085
Accrued interest payable 39,897 19,124
Fair Value, Inputs, Level 2 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities - available-for-sale 3,270,620 3,507,841
Investment securities - held-to-maturity 1,277,090 1,281,982
FHLB and other borrowed funds 1,300,750 1,301,300
Fair Value, Inputs, Level 2 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities - available-for-sale 3,270,620 3,507,841
Investment securities - held-to-maturity 1,194,455 1,170,481
FHLB and other borrowed funds 1,277,447 1,291,926
Fair Value, Inputs, Level 3 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, net of impaired loans and allowance 14,397,652 14,048,002
FHLB, FRB & FNBB Bank stock; other equity investments 226,631 223,748
Time deposits 1,802,116 1,651,863
Subordinated debentures 439,394 439,834
Fair Value, Inputs, Level 3 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, net of impaired loans and allowance 14,489,849 14,071,775
FHLB, FRB & FNBB Bank stock; other equity investments 226,631 223,748
Time deposits 1,792,949 1,633,091
Subordinated debentures $ 388,048 $ 358,682