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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Financial assets:    
Federal funds sold $ 3,725 $ 5,100
Investment securities - available for sale 3,072,639 3,507,841
Investment securities - held-to-maturity 1,142,940 1,170,481
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 910,347 1,000,213
Federal funds sold 3,725 5,100
Accrued interest receivable 120,129 118,966
Marketable equity securities 48,954 49,419
Financial liabilities:    
Demand and non-interest bearing 4,006,115 4,085,501
Savings and interest-bearing transaction accounts 11,347,850 11,050,347
Securities sold under agreements to repurchase 162,350 142,085
Accrued interest payable 20,186 19,124
Level 1 | Fair Value    
Financial assets:    
Cash and cash equivalents 910,347 1,000,213
Federal funds sold 3,725 5,100
Accrued interest receivable 120,129 118,966
Marketable equity securities 48,954 49,419
Financial liabilities:    
Demand and non-interest bearing 4,006,115 4,085,501
Savings and interest-bearing transaction accounts 11,347,850 11,050,347
Securities sold under agreements to repurchase 162,350 142,085
Accrued interest payable 20,186 19,124
Level 2 | Carrying Amount    
Financial assets:    
Investment securities - available for sale 3,051,110 3,485,031
Investment securities - held-to-maturity 1,275,204 1,281,982
Financial liabilities:    
FHLB and other borrowed funds 600,750 1,301,300
Level 2 | Fair Value    
Financial assets:    
Investment securities - available for sale 3,051,110 3,485,031
Investment securities - held-to-maturity 1,142,940 1,170,481
Financial liabilities:    
FHLB and other borrowed funds 556,095 1,291,926
Level 3 | Carrying Amount    
Financial assets:    
Investment securities - available for sale 21,529 22,810
Loans receivable, net of impaired loans and allowance 14,244,458 14,048,002
FHLB, FRB & FNBB stock; other equity investments 226,910 223,748
Financial liabilities:    
Time deposits 1,792,332 1,651,863
Subordinated debentures 439,246 439,834
Level 3 | Fair Value    
Financial assets:    
Investment securities - available for sale 21,529 22,810
Loans receivable, net of impaired loans and allowance 14,207,935 14,071,775
FHLB, FRB & FNBB stock; other equity investments 226,910 223,748
Financial liabilities:    
Time deposits 1,781,156 1,633,091
Subordinated debentures $ 375,887 $ 358,682