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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Held to Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost $ 3,496,571 $ 3,532,220    
Gross Unrealized Gains 11,616 2,107    
Gross Unrealized Losses (378,584) (506,043)    
Fair Value 3,129,603 3,028,284    
Held-to-maturity, allowance for credit loss 734 647 $ 1,205 $ 1,646
Net Carrying Value 3,495,837 3,531,573    
U.S. Treasury securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost   25,480    
Gross Unrealized Gains   0    
Gross Unrealized Losses   (19)    
Fair Value   25,461    
Held-to-maturity, allowance for credit loss   0    
Net Carrying Value   25,480    
U.S. government agency securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 292,269 301,315    
Gross Unrealized Gains 19 0    
Gross Unrealized Losses (39,226) (49,013)    
Fair Value 253,062 252,302    
Held-to-maturity, allowance for credit loss 0 0    
Net Carrying Value 292,269 301,315    
Obligations of states and state agencies        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 60,801 68,025    
Gross Unrealized Gains 504 0    
Gross Unrealized Losses (3,293) (5,335)    
Fair Value 58,012 62,690    
Held-to-maturity, allowance for credit loss 2 2    
Net Carrying Value 60,799 68,023    
Municipal bonds        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 293,074 304,464    
Gross Unrealized Gains 43 9    
Gross Unrealized Losses (17,295) (20,802)    
Fair Value 275,822 283,671    
Held-to-maturity, allowance for credit loss 134 48    
Net Carrying Value 292,940 304,416    
Obligations of states and political subdivisions        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 353,875 372,489    
Gross Unrealized Gains 547 9    
Gross Unrealized Losses (20,588) (26,137)    
Fair Value 333,834 346,361    
Held-to-maturity, allowance for credit loss 136 50    
Net Carrying Value 353,739 372,439    
Residential mortgage-backed securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 2,732,752 2,710,642    
Gross Unrealized Gains 11,050 2,088    
Gross Unrealized Losses (311,815) (420,582)    
Fair Value 2,431,987 2,292,148    
Held-to-maturity, allowance for credit loss 0 0    
Net Carrying Value 2,732,752 2,710,642    
Trust preferred securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 36,103 36,081    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (5,414) (6,936)    
Fair Value 30,689 29,145    
Held-to-maturity, allowance for credit loss 425 414    
Net Carrying Value 35,678 35,667    
Corporate and other debt securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 81,572 86,213    
Gross Unrealized Gains 0 10    
Gross Unrealized Losses (1,541) (3,356)    
Fair Value 80,031 82,867    
Held-to-maturity, allowance for credit loss 173 183    
Net Carrying Value $ 81,399 $ 86,030