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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities - available for sale | $ 3,344,539 | $ 3,507,841
Investment securities - held-to-maturity | 1,159,160 | 1,170,481
Fair Value, Inputs, Level 1 | Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,058,716 | 1,000,213
Federal funds sold |  | 5,100
Accrued interest receivable | 120,984 | 118,966
Marketable equity securities | 50,147 | 49,419
Demand and non-interest bearing | 4,068,302 | 4,085,501
Savings and interest-bearing transaction accounts | 11,150,516 | 11,050,347
Securities sold under agreements to repurchase | 137,996 | 142,085
Accrued interest payable | 35,559 | 19,124
Fair Value, Inputs, Level 1 | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,058,716 | 1,000,213
Federal funds sold |  | 5,100
Accrued interest receivable | 120,984 | 118,966
Marketable equity securities | 50,147 | 49,419
Demand and non-interest bearing | 4,068,302 | 4,085,501
Savings and interest-bearing transaction accounts | 11,150,516 | 11,050,347
Securities sold under agreements to repurchase | 137,996 | 142,085
Accrued interest payable | 35,559 | 19,124
Fair Value, Inputs, Level 2 | Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment securities - available for sale | 3,344,539 | 3,507,841
Investment securities - held-to-maturity | 1,278,853 | 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 | 3,344,539 | 3,507,841
Investment securities - held-to-maturity | 1,159,160 | 1,170,481
FHLB and other borrowed funds | 1,281,175 | 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 | 14,393,901 | 14,048,002
FHLB, FRB & FNBB Bank stock; other equity investments | 227,067 | 223,748
Time deposits | 1,736,985 | 1,651,863
Subordinated debentures | 439,542 | 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 | 14,334,637 | 14,071,775
FHLB, FRB & FNBB Bank stock; other equity investments | 227,067 | 223,748
Time deposits | 1,718,037 | 1,633,091
Subordinated debentures | $ 379,572 | $ 358,682

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