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Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Sep. 30, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value $ 2,059,837 $ 2,051,037
Held-to-maturity securities, at amortized cost 453,443 463,299
FHLB and FRB stock 133,073 95,073
Agency pass-through certificates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity securities, at amortized cost 453,443 463,299
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 2,059,837 2,051,037
Held-to-maturity securities, at amortized cost 453,443 463,299
Carrying Amount | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 645,862 683,965
Carrying Amount | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
FHLB and FRB stock 133,073 95,073
Time deposits 3,412,203 3,338,043
FHLB advances 3,075,000 2,125,000
Carrying Amount | Level 2 | Client swap program hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 63,383 67,260
Other liabilities 63,383 67,260
Carrying Amount | Level 2 | Commercial loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 2,446 2,517
Carrying Amount | Level 2 | Mortgage loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 33,986 36,765
Carrying Amount | Level 2 | Borrowings cash flow hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 173,139 179,945
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 99,889 39,354
Carrying Amount | Level 2 | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 696,572 767,001
Carrying Amount | Level 2 | Municipal bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 35,054 34,962
Carrying Amount | Level 2 | Corporate debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 316,487 313,757
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 911,835 895,963
Held-to-maturity securities, at amortized cost 453,443 463,299
Carrying Amount | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable 16,993,588 16,113,564
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 2,059,837 2,051,037
Held-to-maturity securities, at amortized cost 402,055 406,860
Estimated Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 645,862 683,965
Estimated Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
FHLB and FRB stock 133,073 95,073
Time deposits 3,329,708 3,249,169
FHLB advances 3,067,487 1,940,813
Estimated Fair Value | Level 2 | Client swap program hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 63,383 67,260
Other liabilities 63,383 67,260
Estimated Fair Value | Level 2 | Commercial loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 2,446 2,517
Estimated Fair Value | Level 2 | Mortgage loan fair value hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 33,986 36,765
Estimated Fair Value | Level 2 | Borrowings cash flow hedges    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 173,139 179,945
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 99,889 39,354
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 696,572 767,001
Estimated Fair Value | Level 2 | Municipal bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale securities, at fair value 35,054 34,962
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 316,487 313,757
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 911,835 895,963
Held-to-maturity securities, at amortized cost 402,055 406,860
Estimated Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable $ 16,310,687 $ 15,417,635