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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
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost $ 1,754,709 $ 1,727,630
Available for sale securities, Gross unrealized gains [1] 536 6
Available-for-sale securities, Gross unrealized losses [1] (170,647) (175,950)
Available-for-sale securities, at fair value 1,584,598 [2] 1,551,686
Held-to-maturity securities, Amortized cost [3] 6,524,954 [2] 5,888,798
Held-to-maturity Securities, Gross unrealized gains [1],[3] 26,498 6,387
Held-to-maturity Securities, Gross unrealized losses [1],[3] (3,805) (43,009)
Held-to-maturity securities, Estimated fair value [3] 6,547,647 5,852,176
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 2,407 2,376
Available for sale securities, Gross unrealized gains [1] 0 5
Available-for-sale securities, Gross unrealized losses [1] (141) (162)
Available-for-sale securities, at fair value 2,266 2,219
State and Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 2,350 2,350
Available for sale securities, Gross unrealized gains [1] 0 1
Available-for-sale securities, Gross unrealized losses [1] (1) 0
Available-for-sale securities, at fair value 2,349 2,351
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 1,045,344 855,456
Available for sale securities, Gross unrealized gains [1] 334 0
Available-for-sale securities, Gross unrealized losses [1] (124,115) (109,286)
Available-for-sale securities, at fair value 921,563 [2] 746,170
Mortgage-Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 69,430 70,326
Available for sale securities, Gross unrealized gains [1] 0 0
Available-for-sale securities, Gross unrealized losses [1] (1,474) (3,655)
Available-for-sale securities, at fair value 67,956 [2] 66,671
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 206 274
Available for sale securities, Gross unrealized gains [1] 0 0
Available-for-sale securities, Gross unrealized losses [1] (7) (13)
Available-for-sale securities, at fair value 199 [2] 261
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 507,824 615,131
Available for sale securities, Gross unrealized gains [1] 0 0
Available-for-sale securities, Gross unrealized losses [1] (43,832) (58,970)
Available-for-sale securities, at fair value 463,992 556,161
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale securities, Amortized cost 127,148 181,717
Available for sale securities, Gross unrealized gains [1] 202 0
Available-for-sale securities, Gross unrealized losses [1] (1,077) (3,864)
Available-for-sale securities, at fair value 126,273 [2] $ 177,853
Held-to-maturity securities, Amortized cost $ 6,524,954  
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.
[2] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[3] 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.