v3.26.1
Available-for-Sale and Held-to-Maturity Securities (Schedule of Amortized Cost and Fair Values of Available for Sale Securities and Held to Maturity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost $ 1,644,585 $ 1,698,589
Available for sale securities, Gross unrealized gains [1] 2,945 4,861
Available-for-sale securities, Gross unrealized losses [1] (118,025) (110,060)
Available-for-sale securities, at fair value 1,529,505 1,593,390
Held-to-maturity securities, at amortized cost [2] 6,881,353 6,549,054
Held-to-maturity Securities, Gross unrealized gains [2] 17,267 18,943 [1]
Held-to-maturity Securities, Gross unrealized losses [1],[2] (3,498) (2,513)
Held-to-maturity securities, Estimated fair value [2] 6,895,122 6,565,484
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 2,457 2,440
Available for sale securities, Gross unrealized gains [1] 1 6
Available-for-sale securities, Gross unrealized losses [1] (63) (65)
Available-for-sale securities, at fair value 2,395 2,381
State and Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 2,325 2,325
Available for sale securities, Gross unrealized gains [1] 0 1
Available-for-sale securities, Gross unrealized losses [1] (5) 0
Available-for-sale securities, at fair value 2,320 2,326
Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 1,199,849 1,181,888
Available for sale securities, Gross unrealized gains [1] 2,776 4,652
Available-for-sale securities, Gross unrealized losses [1] (92,945) (85,128)
Available-for-sale securities, at fair value 1,109,680 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, Amortized cost 1,302 2,136
Available for sale securities, Gross unrealized gains [1] 0 0
Available-for-sale securities, Gross unrealized losses [1] (33) (23)
Available-for-sale securities, at fair value 1,269 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, Amortized cost 134 156
Available for sale securities, Gross unrealized gains [1] 0 0
Available-for-sale securities, Gross unrealized losses [1] (1) (4)
Available-for-sale securities, at fair value 133 152
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 360,966 400,053
Available for sale securities, Gross unrealized gains [1] 117 94
Available-for-sale securities, Gross unrealized losses [1] (24,622) (24,397)
Available-for-sale securities, at fair value 336,461 375,750
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 77,552 109,591
Available for sale securities, Gross unrealized gains [1] 51 108
Available-for-sale securities, Gross unrealized losses [1] (356) (443)
Available-for-sale securities, at fair value 77,247 $ 109,256
Held-to-maturity securities, at amortized cost $ 6,881,353  
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.
[2] 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.