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Available-for-Sale and Held-to-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Jun. 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 $ 54,345 $ 78,080
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 139,821  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 354,549 352,736
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 997,677 1,016,733
Available-for-sale Securities, debt maturities, Fair Value 1,546,392 1,584,598
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,509,599 3,063,278
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,934,032 3,370,492
Held-to-maturity securities, at amortized cost [1] 6,584,925 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 2,338  
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 2,338  
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 2,350  
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 2,350  
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 54,345  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value 134,997  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 244,795  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 0  
Available-for-sale Securities, debt maturities, Fair Value 434,137  
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 136  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 84,568  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 863,455  
Available-for-sale Securities, debt maturities, Fair Value 948,159 921,563
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 41,656  
Available-for-sale Securities, debt maturities, Fair Value 41,656 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 168  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 0  
Available-for-sale Securities, debt maturities, Fair Value 168 199
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 25,018  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 92,566  
Available-for-sale Securities, debt maturities, Fair Value 117,584 $ 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 141,294  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,509,599  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,934,032  
Held-to-maturity securities, at amortized cost $ 6,584,925  
[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.