v3.25.2
Securities Securities - Amortized Cost, Allowance for Credit Losses and Estimated Fair Value of Securities Held to Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost $ 3,486,600 $ 3,534,085
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 617 13,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 269,008 187,493
Debt Securities, Held-to-maturity, Fair Value 3,218,209 3,360,546
Securities, held-to-maturity, allowance for credit loss (310) (310)
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 3,486,290 3,533,775
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost 1,160,686 1,193,840
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 44,267 71,076
Debt Securities, Held-to-maturity, Fair Value 1,116,419 1,122,764
Securities, held-to-maturity, allowance for credit loss 0 0
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 1,160,686 1,193,840
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost 2,324,414 2,338,745
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 617 13,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 224,735 116,414
Debt Securities, Held-to-maturity, Fair Value 2,100,296 2,236,285
Securities, held-to-maturity, allowance for credit loss (310) (310)
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 2,324,104 2,338,435
Other Investments [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost 1,500 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 6 3
Debt Securities, Held-to-maturity, Fair Value 1,494 1,497
Securities, held-to-maturity, allowance for credit loss 0 0
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 $ 1,500 $ 1,500