v3.26.3
Available-for-Sale and Held-to-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value $ 11,976 $ 103,686
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 246,004  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 69,026 241,770
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,185,742 1,112,750
Available-for-sale Securities, debt maturities, Fair Value 1,512,748 1,593,390
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 472,405 1,494,530
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 5,942,278 4,896,754
Held-to-maturity securities, at amortized cost [1] 6,512,020 6,549,054
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 2,402  
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 2,402  
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 2,291  
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 2,291  
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 11,974  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 227,042  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 4,985  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 0  
Available-for-sale Securities, debt maturities, Fair Value 244,001  
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 2  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 14,269  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 63,917  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,122,361  
Available-for-sale Securities, debt maturities, Fair Value 1,200,549 1,101,412
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 1,243  
Available-for-sale Securities, debt maturities, Fair Value 1,243 2,113
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 124  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 0  
Available-for-sale Securities, debt maturities, Fair Value 124 152
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 0  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 62,138  
Available-for-sale Securities, debt maturities, Fair Value 62,138 $ 109,256
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 97,337  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 472,405  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 5,942,278  
Held-to-maturity securities, at amortized cost $ 6,512,020  
[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.