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FAIR VALUE MEASUREMENTS - Fair Value Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value $ 3,533,201 $ 2,572,709
Total Financial Assets 4,145,940 2,973,755
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 3,533,201 2,572,709
Total Financial Assets 3,684,472 2,738,333
Total Financial Liabilities 73,330 48,055
Recurring | Client swap program hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 37,347 46,758
Derivative liabilities 37,818 47,388
Recurring | Commercial loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 1,611 1,595
Recurring | Mortgage loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 13,082  
Derivative liabilities 20,426 667
Recurring | Borrowing hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 99,231 117,271
Recurring | Mortgage backed securities fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 15,086  
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Total Financial Assets 0 0
Total Financial Liabilities 0 0
Recurring | Level 1 | Client swap program hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring | Level 1 | Commercial loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Recurring | Level 1 | Mortgage loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Derivative liabilities 0 0
Recurring | Level 1 | Borrowing hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Recurring | Level 1 | Mortgage backed securities fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 3,533,201 2,572,709
Total Financial Assets 3,684,472 2,738,333
Total Financial Liabilities 73,330 48,055
Recurring | Level 2 | Client swap program hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 37,347 46,758
Derivative liabilities 37,818 47,388
Recurring | Level 2 | Commercial loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 1,611 1,595
Recurring | Level 2 | Mortgage loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 13,082  
Derivative liabilities 20,426 667
Recurring | Level 2 | Borrowing hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 99,231 117,271
Recurring | Level 2 | Mortgage backed securities fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 15,086  
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Total Financial Assets 0 0
Total Financial Liabilities 0 0
Recurring | Level 3 | Client swap program hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring | Level 3 | Commercial loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Recurring | Level 3 | Mortgage loan fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Derivative liabilities 0 0
Recurring | Level 3 | Borrowing hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Recurring | Level 3 | Mortgage backed securities fair value hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities 0  
U.S. government and agency securities | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 235,919 314,204
U.S. government and agency securities | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
U.S. government and agency securities | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 235,919 314,204
U.S. government and agency securities | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Asset-backed securities due | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 506,334 540,125
Asset-backed securities due | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Asset-backed securities due | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 506,334 540,125
Asset-backed securities due | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0
Municipal bonds | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 35,258 35,073
Municipal bonds | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Municipal bonds | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 35,258 35,073
Municipal bonds | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Corporate debt securities | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 152,537 296,282
Corporate debt securities | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Corporate debt securities | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 152,537 296,282
Corporate debt securities | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Agency pass-through certificates | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 2,603,153 1,387,025
Agency pass-through certificates | Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 0 0
Agency pass-through certificates | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 2,603,153 1,387,025
Agency pass-through certificates | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value $ 0 $ 0