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Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Amortized Cost, Available-for-sale securities    
Amortized cost $ 2,616,877 $ 2,118,616
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains 10,531 2,910
Gross unrealized loss (54,699) (126,429)
Fair Value, Available-for-sale securities    
Available-for-sale securities, at fair value $ 2,572,709 $ 1,995,097
Yield, Available-for-sale securities    
Yield 4.87% 4.64%
Amortized Cost, Held-to-maturity securities    
Held-to-maturity securities, amortized cost $ 436,972 $ 423,586
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains 913 0
Gross unrealized losses (36,839) (68,398)
Fair Value, Held-to-maturity securities    
Fair value $ 401,046 $ 355,188
Yield, Held-to-maturity securities    
Without single maturity date   2.88%
Yield 3.18%  
Investments $ 3,053,849 $ 2,542,202
Gross unrealized gains on investments 11,444 2,910
Gross unrealized losses on investments (91,538) (194,827)
Total Financial Assets $ 2,973,755 $ 2,350,285
Yield on investments 4.63% 4.35%
U.S. government and agency securities due    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 4,360 $ 3,501
1 to 5 years 4,640 18,894
5 to 10 years 166,070 87,922
Over 10 years 137,799 106,340
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, within 1 year 4 0
Gross unrealized gains, 1 to 5 years 2 0
Gross unrealized gains, 5 to 10 years 1,230 177
Gross unrealized gains, over 10 years 394 831
Gross unrealized losses, within 1 year 0 (36)
Gross unrealized losses, 1 to 5 years (124) (563)
Gross unrealized losses, 5 to 10 years 0 0
Gross unrealized losses, over 10 years (171) (13)
Fair Value, Available-for-sale securities    
Within 1 year 4,364 3,465
1 to 5 years 4,518 18,331
5 to 10 years 167,300 88,099
Over 10 years $ 138,022 $ 107,158
Yield, Available-for-sale securities    
Within 1 year 5.58% 6.06%
1 to 5 years 2.82% 4.70%
5 to 10 years 5.97% 5.76%
Over 10 years 6.29% 5.84%
Asset-backed securities due    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 11,466 $ 18,579
5 to 10 years 9,631 36,875
Over 10 years 520,756 539,911
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 0 0
Gross unrealized gains, 5 to 10 years 0 2
Gross unrealized gains, over 10 years 600 578
Gross unrealized losses, 1 to 5 years (284) (715)
Gross unrealized losses, 5 to 10 years (3) (99)
Gross unrealized losses, over 10 years (2,041) (7,115)
Fair Value, Available-for-sale securities    
1 to 5 years 11,182 17,864
5 to 10 years 9,628 36,778
Over 10 years $ 519,315 $ 533,374
Yield, Available-for-sale securities    
1 to 5 years 6.04% 6.06%
5 to 10 years 6.20% 6.11%
Over 10 years 6.15% 6.35%
Corporate debt securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 45,024 $ 0
1 to 5 years 99,244 151,893
5 to 10 years 112,029 113,221
Over 10 years 50,000  
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, within 1 year 0 0
Gross unrealized gains, 1 to 5 years 977 895
Gross unrealized gains, 5 to 10 years 0 0
Gross unrealized gains, over 10 years 0  
Gross unrealized losses, within 1 year (367) 0
Gross unrealized losses, 1 to 5 years 0 (1,787)
Gross unrealized losses, 5 to 10 years (10,625) (21,700)
Gross unrealized losses, over 10 years 0  
Fair Value, Available-for-sale securities    
Within 1 year 44,657 0
1 to 5 years 100,221 151,001
5 to 10 years 101,404 $ 91,521
Over 10 years $ 50,000  
Yield, Available-for-sale securities    
Within 1 year 4.61% 0.00%
1 to 5 years 5.39% 5.14%
5 to 10 years 3.87% 3.87%
Over 10 years 6.85%  
Municipal bonds    
Amortized Cost, Available-for-sale securities    
5 to 10 years $ 5,689 $ 5,720
Over 10 years 29,793 29,832
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 5 to 10 years 0 0
Gross unrealized gains, over 10 years 0 361
Gross unrealized losses, 5 to 10 years (243) (701)
Gross unrealized losses, over 10 years (166) (550)
Fair Value, Available-for-sale securities    
5 to 10 years 5,446 5,019
Over 10 years $ 29,627 $ 29,643
Yield, Available-for-sale securities    
5 to 10 years 3.00% 3.00%
Over 10 years 5.85% 5.85%
Agency pass-through certificates    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 1,420,376 $ 1,005,928
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, without single maturity date 7,324 66
Gross unrealized losses, without single maturity date (40,675) (93,150)
Fair Value, Available-for-sale securities    
Without single maturity date $ 1,387,025 $ 912,844
Yield, Available-for-sale securities    
Without single maturity date 4.09% 3.39%
Amortized Cost, Held-to-maturity securities    
Without single maturity date $ 436,972 $ 423,586
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains, without single maturity date 913 0
Gross unrealized losses, without single maturity date (36,839) (68,398)
Fair Value, Held-to-maturity securities    
Without single maturity date $ 401,046 $ 355,188
Yield, Held-to-maturity securities    
Without single maturity date 3.18% 2.88%