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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets: |  |
Investment securities - available for sale | $ 3,507,841 | $ 4,041,590
Investment securities - held-to-maturity | 1,170,481 | 1,126,146
Level 1 | Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 1,000,213 | 724,790
Accrued interest receivable | 118,966 | 103,199
Marketable equity securities | 49,419 | 52,034
Financial liabilities: |  |
Demand and non-interest bearing | 4,085,501 | 5,164,997
Savings and interest-bearing transaction accounts | 11,050,347 | 11,730,552
Securities sold under agreements to repurchase | 142,085 | 131,146
Accrued interest payable | 19,124 | 10,622
Level 1 | Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 1,000,213 | 724,790
Accrued interest receivable | 118,966 | 103,199
Marketable equity securities | 49,419 | 52,034
Financial liabilities: |  |
Demand and non-interest bearing | 4,085,501 | 5,164,997
Savings and interest-bearing transaction accounts | 11,050,347 | 11,730,552
Securities sold under agreements to repurchase | 142,085 | 131,146
Accrued interest payable | 19,124 | 10,622
Level 2 | Carrying Amount |  |
Financial assets: |  |
Investment securities - available for sale | 3,507,841 | 4,041,590
Investment securities - held-to-maturity | 1,281,982 | 1,287,705
Financial liabilities: |  |
FHLB and other borrowed funds | 1,301,300 | 650,000
Level 2 | Fair Value |  |
Financial assets: |  |
Investment securities - available for sale | 3,507,841 | 4,041,590
Investment securities - held-to-maturity | 1,170,481 | 1,126,146
Financial liabilities: |  |
FHLB and other borrowed funds | 1,291,926 | 595,886
Level 3 | Carrying Amount |  |
Financial assets: |  |
Loans receivable, net of impaired loans and allowance | 14,048,002 | 13,929,892
FHLB, FRB & FNBB stock; other equity investments | 223,748 | 215,952
Financial liabilities: |  |
Time deposits | 1,651,863 | 1,043,234
Subordinated debentures | 439,834 | 440,420
Level 3 | Fair Value |  |
Financial assets: |  |
Loans receivable, net of impaired loans and allowance | 14,071,775 | 13,723,865
FHLB, FRB & FNBB stock; other equity investments | 223,748 | 215,952
Financial liabilities: |  |
Time deposits | 1,633,091 | 1,014,348
Subordinated debentures | $ 358,682 | $ 411,686

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