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Financial Instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets:    
Fed funds sold $ 3,625 $ 3,725
Investment securities - held-to-maturity 1,157,119 1,142,940
Carrying Amount    
Financial assets:    
Cash and cash equivalents 800,920 910,347
Fed funds sold 3,625 3,725
Investment securities - held-to-maturity 1,264,200 1,275,204
Loans receivable, net of impaired loans and allowance 14,792,587 14,244,458
Accrued interest receivable 110,702 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 225,959 226,910
Marketable equity securities 55,177 48,954
Financial liabilities:    
Demand and non-interest bearing 3,880,101 4,006,115
Savings and interest-bearing transaction accounts 11,500,921 11,347,850
Time deposits 1,946,674 1,792,332
Securities sold under agreements to repurchase 145,998 162,350
FHLB and other borrowed funds 550,500 600,750
Accrued interest payable 14,151 20,186
Subordinated debentures 279,093 439,246
Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 800,920 910,347
Fed funds sold 3,625 3,725
Investment securities - held-to-maturity 1,157,119 1,142,940
Loans receivable, net of impaired loans and allowance 14,817,424 14,207,935
Accrued interest receivable 110,702 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 225,959 226,910
Marketable equity securities 55,177 48,954
Financial liabilities:    
Demand and non-interest bearing 3,880,101 4,006,115
Savings and interest-bearing transaction accounts 11,500,921 11,347,850
Time deposits 1,932,935 1,781,156
Securities sold under agreements to repurchase 145,998 162,350
FHLB and other borrowed funds 520,928 556,095
Accrued interest payable 14,151 20,186
Subordinated debentures 257,137 375,887
Level 1 | Fair Value Measurements    
Financial assets:    
Cash and cash equivalents 800,920 910,347
Fed funds sold 3,625 3,725
Investment securities - held-to-maturity 0 0
Loans receivable, net of impaired loans and allowance 0 0
Accrued interest receivable 110,702 120,129
FHLB, Federal Reserve & FNBB stock; other equity investments 0 0
Marketable equity securities 55,177 48,954
Financial liabilities:    
Demand and non-interest bearing 3,880,101 4,006,115
Savings and interest-bearing transaction accounts 11,500,921 11,347,850
Time deposits 0 0
Securities sold under agreements to repurchase 145,998 162,350
FHLB and other borrowed funds 0 0
Accrued interest payable 14,151 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 1,157,119 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 520,928 556,095
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 14,817,424 14,207,935
Accrued interest receivable 0 0
FHLB, Federal Reserve & FNBB stock; other equity investments 225,959 226,910
Marketable equity securities 0 0
Financial liabilities:    
Demand and non-interest bearing 0 0
Savings and interest-bearing transaction accounts 0 0
Time deposits 1,932,935 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 $ 257,137 $ 375,887