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Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Financial assets:    
Fed funds sold $ 2,600 $ 3,725
Investment securities - held-to-maturity 1,127,000 1,142,940
Carrying Amount    
Financial assets:    
Cash and cash equivalents 1,101,073 910,347
Fed funds sold 2,600 3,725
Investment securities - held-to-maturity 1,265,292 1,275,204
Loans receivable, net of impaired loans and allowance 14,671,934 14,244,458
Accrued interest receivable 107,732 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 225,716 226,910
Marketable equity securities 54,157 48,954
Financial liabilities:    
Demand and non-interest bearing 4,024,574 4,006,115
Savings and interest-bearing transaction accounts 11,571,949 11,347,850
Time deposits 1,891,909 1,792,332
Securities sold under agreements to repurchase 140,813 162,350
FHLB and other borrowed funds 550,500 600,750
Accrued interest payable 19,526 20,186
Subordinated debentures 438,957 439,246
Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 1,101,073 910,347
Fed funds sold 2,600 3,725
Investment securities - held-to-maturity 1,127,000 1,142,940
Loans receivable, net of impaired loans and allowance 14,689,730 14,207,935
Accrued interest receivable 107,732 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 225,716 226,910
Marketable equity securities 54,157 48,954
Financial liabilities:    
Demand and non-interest bearing 4,024,574 4,006,115
Savings and interest-bearing transaction accounts 11,571,949 11,347,850
Time deposits 1,877,390 1,781,156
Securities sold under agreements to repurchase 140,813 162,350
FHLB and other borrowed funds 516,042 556,095
Accrued interest payable 19,526 20,186
Subordinated debentures 410,064 375,887
Level 1 | Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 1,101,073 910,347
Fed funds sold 2,600 3,725
Investment securities - held-to-maturity 0 0
Loans receivable, net of impaired loans and allowance 0 0
Accrued interest receivable 107,732 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 0 0
Marketable equity securities 54,157 48,954
Financial liabilities:    
Demand and non-interest bearing 4,024,574 4,006,115
Savings and interest-bearing transaction accounts 11,571,949 11,347,850
Time deposits 0 0
Securities sold under agreements to repurchase 140,813 162,350
FHLB and other borrowed funds 0 0
Accrued interest payable 19,526 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 1,127,000 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 516,042 556,095
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 14,689,730 14,207,935
Accrued interest receivable 0 0
FHLB, Federal Reserve & FNBB stock; other equity investments 225,716 226,910
Marketable equity securities 0 0
Financial liabilities:    
Demand and non-interest bearing 0 0
Savings and interest-bearing transaction accounts 0 0
Time deposits 1,877,390 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 $ 410,064 $ 375,887