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Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value $ 2,018,445 $ 1,995,097
Held-to-maturity securities, at amortized cost 415,079 423,586
FHLB stock 137,940 126,820
Agency pass-through certificates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity securities, at amortized cost 415,079 423,586
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 2,018,445 1,995,097
Held-to-maturity securities, at amortized cost 415,079 423,586
Carrying Amount | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,144,774 980,649
Carrying Amount | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
FHLB stock 137,940 126,820
Time deposits 5,380,723 5,305,016
Borrowings 3,875,000 3,650,000
Carrying Amount | Level 2 | Client swap program hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 55,631 78,797
Other liabilities 56,392 79,668
Carrying Amount | Level 2 | Commercial loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 2,061 3,405
Carrying Amount | Level 2 | Mortgage loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 22,244 46,396
Carrying Amount | Level 2 | Borrowings cash flow hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 143,846 184,373
Carrying Amount | Level 2 | U.S. government and agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 232,359 217,053
Carrying Amount | Level 2 | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 561,304 588,016
Carrying Amount | Level 2 | Municipal bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 35,206 34,662
Carrying Amount | Level 2 | Corporate debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 248,813 242,522
Carrying Amount | Level 2 | Agency pass-through certificates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 940,763 912,844
Held-to-maturity securities, at amortized cost 415,079 423,586
Carrying Amount | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable 17,584,622 17,476,550
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 2,018,445 1,995,097
Held-to-maturity securities, at amortized cost 370,942 355,188
Estimated Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 1,144,774 980,649
Estimated Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
FHLB stock 137,940 126,820
Time deposits 5,363,731 5,232,689
Borrowings 3,867,812 3,653,229
Estimated Fair Value | Level 2 | Client swap program hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 55,631 78,797
Other liabilities 56,392 79,668
Estimated Fair Value | Level 2 | Commercial loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 2,061 3,405
Estimated Fair Value | Level 2 | Mortgage loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 22,244 46,396
Estimated Fair Value | Level 2 | Borrowings cash flow hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 143,846 184,373
Estimated Fair Value | Level 2 | U.S. government and agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 232,359 217,053
Estimated Fair Value | Level 2 | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 561,304 588,016
Estimated Fair Value | Level 2 | Municipal bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 35,206 34,662
Estimated Fair Value | Level 2 | Corporate debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 248,813 242,522
Estimated Fair Value | Level 2 | Agency pass-through certificates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 940,763 912,844
Held-to-maturity securities, at amortized cost 370,942 355,188
Estimated Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable $ 16,876,965 $ 16,559,758