v3.26.1
Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities [1] $ 17,751,637 $ 19,308,192
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 62,684 66,897
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 3,370  
Debt Securities, Available-for-sale, Amortized Cost 17,509,847 19,125,045
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 245,160 185,891
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,370 2,744
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 62,684 66,897
Available-for-sale securities [1] 17,751,637 19,308,192
US Government-sponsored Enterprises Debt Securities [Member]    
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities 543,817 1,498,831
Debt Securities, Available-for-sale, Amortized Cost 538,687 1,489,642
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,130 9,189
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale securities 543,817 1,498,831
Non-mortgage-backed securities [Member]    
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities 543,817 1,498,831
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost 301,435 1,035,186
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost 237,252 440,776
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost 0 13,680
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 302,725 1,037,965
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value 241,092 446,564
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value 0 14,302
Debt Securities, Available-for-sale, Amortized Cost 538,687 1,489,642
Available-for-sale securities 543,817 1,498,831
Other Liabilities    
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities   818,975
Available-for-sale securities   818,975
Multifamily [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities 17,207,820 17,809,361
Debt Securities, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 146,624 207,012
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,469 636
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 36,059 88,049
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,901 2,108
Debt Securities, Available-for-sale, Unrealized Loss Position 182,683 295,061
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 3,370 2,744
Debt Securities, Available-for-sale, Amortized Cost 16,971,160 17,635,403
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 240,030 176,702
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,370 2,744
Available-for-sale securities $ 17,207,820 $ 17,809,361
[1] Amortized cost: $17,509,847 and $19,125,045 at June 30, 2026 and December 31, 2025, respectively.