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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