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INVESTMENT SECURITIES - Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Amortized Cost, Available-for-sale securities    
Amortized cost $ 3,542,438 $ 2,616,877
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains 40,997 10,531
Gross unrealized loss (50,234) (54,699)
Fair Value, Available-for-sale securities    
Available-for-sale securities, at fair value $ 3,533,201 $ 2,572,709
Yield, Available-for-sale securities    
Yield 4.17% 4.87%
Yield, Held-to-maturity securities    
Investments $ 4,188,240 $ 3,053,849
Gross unrealized gains on investments 45,070 11,444
Gross unrealized losses on investments (87,370) (91,538)
Total Financial Assets $ 4,145,940 $ 2,973,755
Yield on investments 4.12% 4.63%
U.S. government and agency securities due    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 1,687 $ 4,360
1 to 5 years 545 4,640
5 to 10 years 158,026 166,070
Over 10 years 75,887 137,799
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, within 1 year 0 4
Gross unrealized gains, 1 to 5 years 0 2
Gross unrealized gains, 5 to 10 years 162 1,230
Gross unrealized gains, over 10 years 163 394
Gross unrealized losses, within 1 year (29) 0
Gross unrealized losses, 1 to 5 years 0 (124)
Gross unrealized losses, 5 to 10 years (295) 0
Gross unrealized losses, over 10 years (227) (171)
Fair Value, Available-for-sale securities    
Within 1 year 1,658 4,364
1 to 5 years 545 4,518
5 to 10 years 157,893 167,300
Over 10 years $ 75,823 $ 138,022
Yield, Available-for-sale securities    
Within 1 year 2.05% 5.58%
1 to 5 years 5.00% 2.82%
5 to 10 years 4.95% 5.97%
Over 10 years 5.52% 6.29%
Asset-backed securities due    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 10,492  
1 to 5 years   $ 11,466
5 to 10 years 3,945 9,631
Over 10 years 491,734 520,756
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, within 1 year 0  
Gross unrealized gains, 1 to 5 years   0
Gross unrealized gains, 5 to 10 years 7 0
Gross unrealized gains, over 10 years 1,702 600
Gross unrealized losses, within 1 year (163)  
Gross unrealized losses, 1 to 5 years   (284)
Gross unrealized losses, 5 to 10 years 0 (3)
Gross unrealized losses, over 10 years (1,383) (2,041)
Fair Value, Available-for-sale securities    
Within 1 year 10,329  
1 to 5 years   11,182
5 to 10 years 3,952 9,628
Over 10 years $ 492,053 $ 519,315
Yield, Available-for-sale securities    
Within 1 year 5.12%  
1 to 5 years   6.04%
5 to 10 years 5.27% 6.20%
Over 10 years 5.36% 6.15%
Corporate debt securities    
Amortized Cost, Available-for-sale securities    
Within 1 year   $ 45,024
1 to 5 years $ 32,821 99,244
5 to 10 years 128,015 112,029
Over 10 years   50,000
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, within 1 year   0
Gross unrealized gains, 1 to 5 years 0 977
Gross unrealized gains, 5 to 10 years 314 0
Gross unrealized gains, over 10 years   0
Gross unrealized losses, within 1 year   (367)
Gross unrealized losses, 1 to 5 years (2,047) 0
Gross unrealized losses, 5 to 10 years (6,566) (10,625)
Gross unrealized losses, over 10 years   0
Fair Value, Available-for-sale securities    
Within 1 year   44,657
1 to 5 years 30,774 100,221
5 to 10 years $ 121,763 101,404
Over 10 years   $ 50,000
Yield, Available-for-sale securities    
Within 1 year   4.61%
1 to 5 years 4.95% 5.39%
5 to 10 years 4.37% 3.87%
Over 10 years   6.85%
Municipal bonds    
Amortized Cost, Available-for-sale securities    
5 to 10 years $ 25,659 $ 5,689
Over 10 years 9,754 29,793
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 5 to 10 years 250 0
Gross unrealized gains, over 10 years 0 0
Gross unrealized losses, 5 to 10 years (179) (243)
Gross unrealized losses, over 10 years (226) (166)
Fair Value, Available-for-sale securities    
5 to 10 years 25,730 5,446
Over 10 years $ 9,528 $ 29,627
Yield, Available-for-sale securities    
5 to 10 years 5.71% 3.00%
Over 10 years 4.57% 5.85%
Agency pass-through certificates    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 2,603,873 $ 1,420,376
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, without single maturity date 38,399 7,324
Gross unrealized losses, without single maturity date (39,119) (40,675)
Fair Value, Available-for-sale securities    
Without single maturity date $ 2,603,153 $ 1,387,025
Yield, Available-for-sale securities    
Without single maturity date 3.83% 4.09%
Amortized Cost, Held-to-maturity securities    
Without single maturity date $ 645,802 $ 436,972
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains, without single maturity date 4,073 913
Gross unrealized losses, without single maturity date (37,136) (36,839)
Fair Value, Held-to-maturity securities    
Without single maturity date $ 612,739 $ 401,046
Yield, Held-to-maturity securities    
Without single maturity date 3.85% 3.18%