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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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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

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