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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Financial assets:    
Fed funds sold $ 6,275 $ 3,725
Investment securities - held-to-maturity 1,153,262 1,142,940
Carrying Amount    
Financial assets:    
Cash and cash equivalents 1,295,730 910,347
Fed funds sold 6,275 3,725
Investment securities - held-to-maturity 1,269,896 1,275,204
Loans receivable, net of impaired loans and allowance 14,451,006 14,244,458
Accrued interest receivable 115,983 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 228,621 226,910
Marketable equity securities 49,395 48,954
Financial liabilities:    
Demand and non-interest bearing 4,079,289 4,006,115
Savings and interest-bearing transaction accounts 11,586,106 11,347,850
Time deposits 1,876,096 1,792,332
Securities sold under agreements to repurchase 161,401 162,350
FHLB and other borrowed funds 600,500 600,750
Accrued interest payable 15,759 20,186
Subordinated debentures 439,102 439,246
Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 1,295,730 910,347
Fed funds sold 6,275 3,725
Investment securities - held-to-maturity 1,153,262 1,142,940
Loans receivable, net of impaired loans and allowance 14,487,545 14,207,935
Accrued interest receivable 115,983 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 228,621 226,910
Marketable equity securities 49,395 48,954
Financial liabilities:    
Demand and non-interest bearing 4,079,289 4,006,115
Savings and interest-bearing transaction accounts 11,586,106 11,347,850
Time deposits 1,861,185 1,781,156
Securities sold under agreements to repurchase 161,401 162,350
FHLB and other borrowed funds 565,740 556,095
Accrued interest payable 15,759 20,186
Subordinated debentures 412,969 375,887
Level 1 | Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 1,295,730 910,347
Fed funds sold 6,275 3,725
Investment securities - held-to-maturity 0 0
Loans receivable, net of impaired loans and allowance 0 0
Accrued interest receivable 115,983 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 0 0
Marketable equity securities 49,395 48,954
Financial liabilities:    
Demand and non-interest bearing 4,079,289 4,006,115
Savings and interest-bearing transaction accounts 11,586,106 11,347,850
Time deposits 0 0
Securities sold under agreements to repurchase 161,401 162,350
FHLB and other borrowed funds 0 0
Accrued interest payable 15,759 20,186
Subordinated debentures 0 0
Level 2 | Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 0 0
Fed funds sold 0
Investment securities - held-to-maturity 1,153,262 1,142,940
Loans receivable, net of impaired loans and allowance 0 0
Accrued interest receivable 0 0
FHLB, Federal Reserve & FNBB stock; other equity investments 0 0
Marketable equity securities 0 0
Financial liabilities:    
Demand and non-interest bearing 0 0
Savings and interest-bearing transaction accounts 0 0
Time deposits 0 0
Securities sold under agreements to repurchase 0 0
FHLB and other borrowed funds 565,740 556,095
Accrued interest payable 0 0
Subordinated debentures 0 0
Level 3 | Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 0 0
Fed funds sold 0 0
Investment securities - held-to-maturity 0 0
Loans receivable, net of impaired loans and allowance 14,487,545 14,207,935
Accrued interest receivable 0 0
FHLB, Federal Reserve & FNBB stock; other equity investments 228,621 226,910
Marketable equity securities 0 0
Financial liabilities:    
Demand and non-interest bearing 0 0
Savings and interest-bearing transaction accounts 0 0
Time deposits 1,861,185 1,781,156
Securities sold under agreements to repurchase 0 0
FHLB and other borrowed funds 0 0
Accrued interest payable 0 0
Subordinated debentures $ 412,969 $ 375,887