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Available-for-Sale and Held-to-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value $ 103,267 $ 78,080
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 110,966  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 297,508 352,736
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,176,895 1,016,733
Available-for-sale Securities, debt maturities, Fair Value 1,688,636 1,584,598
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 1,714,752 3,063,278
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 4,568,264 3,370,492
Held-to-maturity securities, at amortized cost [1] 6,458,002 6,524,954
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value 0  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 2,361  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 0  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 0  
Available-for-sale Securities, debt maturities, Fair Value 2,361  
State and Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value 0  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 2,351  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 0  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 0  
Available-for-sale Securities, debt maturities, Fair Value 2,351  
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value 103,267  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 101,291  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 197,759  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 5,035  
Available-for-sale Securities, debt maturities, Fair Value 407,352  
Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value 0  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 4,963  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 74,563  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,073,434  
Available-for-sale Securities, debt maturities, Fair Value 1,152,960 921,563
Mortgage-Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value 0  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 0  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 0  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 10,976  
Available-for-sale Securities, debt maturities, Fair Value 10,976 67,956
Mortgage-Backed Securities [Member] | Non-Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value 0  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 0  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 158  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 0  
Available-for-sale Securities, debt maturities, Fair Value 158 199
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value 0  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 0  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 25,028  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 87,450  
Available-for-sale Securities, debt maturities, Fair Value 112,478 $ 126,273
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost 0  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 174,986  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 1,714,752  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 4,568,264  
Held-to-maturity securities, at amortized cost $ 6,458,002  
[1] Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.