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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities - available for sale $ 3,400,884 $ 3,507,841
Investment securities - held-to-maturity 1,159,145 1,170,481
Fair Value, Inputs, Level 1 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,175,258 1,000,213
Federal funds sold 5,200 5,100
Accrued interest receivable 119,029 118,966
Marketable equity securities 50,422 49,419
Demand and non-interest bearing 4,115,603 4,085,501
Savings and interest-bearing transaction accounts 11,047,258 11,050,347
Securities sold under agreements to repurchase 176,107 142,085
Accrued interest payable 21,860 19,124
Fair Value, Inputs, Level 1 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,175,258 1,000,213
Federal funds sold 5,200 5,100
Accrued interest receivable 119,029 118,966
Marketable equity securities 50,422 49,419
Demand and non-interest bearing 4,115,603 4,085,501
Savings and interest-bearing transaction accounts 11,047,258 11,050,347
Securities sold under agreements to repurchase 176,107 142,085
Accrued interest payable 21,860 19,124
Fair Value, Inputs, Level 2 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities - available for sale 3,400,884 3,507,841
Investment securities - held-to-maturity 1,280,586 1,281,982
FHLB and other borrowed funds 1,301,050 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 3,400,884 3,507,841
Investment securities - held-to-maturity 1,159,145 1,170,481
FHLB and other borrowed funds 1,288,077 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 14,125,177 14,048,002
FHLB, FRB & FNBB Bank stock; other equity investments 226,765 223,748
Time deposits 1,703,269 1,651,863
Subordinated debentures 439,688 439,834
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 14,068,484 14,071,775
FHLB, FRB & FNBB Bank stock; other equity investments 226,765 223,748
Time deposits 1,681,484 1,633,091
Subordinated debentures $ 364,500 $ 358,682