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Investment Securities - (Unrealized Losses and Fair Value of Securities) (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of debt securities with unrealized loss | security 223 31
Available-for-sale securities    
Less than 12 months, unrealized gross losses $ (99,294) $ (1,584)
12 months or more, unrealized gross losses (13,714) (1,056)
Total, unrealized gross losses (113,008) (2,640)
Less than 12 months, fair value 1,777,599 52,397
12 months or more, fair value 103,603 102,324
Total, fair value 1,881,202 154,721
Held-to-maturity securities    
Less than 12 months, unrealized gross losses (56,461) 0
12 months or more, unrealized gross losses 0 0
Total unrealized gross losses (56,461) 0
Less than 12 months, fair value 405,166 0
12 months or more, fair value 0 0
Total, fair value 405,166 0
Less than 12 months, unrealized gross losses (155,755) (1,584)
12 months or more, unrealized gross losses (13,714) (1,056)
Total unrealized gross losses (169,469) (2,640)
Less than 12 months, fair value 2,182,765 52,397
12 months or more, fair value 103,603 102,324
Total fair value 2,286,368 154,721
Corporate debt securities    
Available-for-sale securities    
Less than 12 months, unrealized gross losses (27,072)  
12 months or more, unrealized gross losses 0  
Total, unrealized gross losses (27,072)  
Less than 12 months, fair value 288,753  
12 months or more, fair value 0  
Total, fair value 288,753  
Municipal bonds    
Available-for-sale securities    
Less than 12 months, unrealized gross losses (1,061)  
12 months or more, unrealized gross losses 0  
Total, unrealized gross losses (1,061)  
Less than 12 months, fair value 14,561  
12 months or more, fair value 0  
Total, fair value 14,561  
U.S. government and agency securities    
Available-for-sale securities    
Less than 12 months, unrealized gross losses (1,049)  
12 months or more, unrealized gross losses 0  
Total, unrealized gross losses (1,049)  
Less than 12 months, fair value 39,354  
12 months or more, fair value 0  
Total, fair value 39,354  
Asset-backed securities    
Available-for-sale securities    
Less than 12 months, unrealized gross losses (6,374) (15)
12 months or more, unrealized gross losses (1,383) (614)
Total, unrealized gross losses (7,757) (629)
Less than 12 months, fair value 601,248 4,639
12 months or more, fair value 50,070 70,058
Total, fair value 651,318 74,697
Mortgage-backed securities    
Available-for-sale securities    
Less than 12 months, unrealized gross losses (63,738) (1,569)
12 months or more, unrealized gross losses (12,331) (442)
Total, unrealized gross losses (76,069) (2,011)
Less than 12 months, fair value 833,683 47,758
12 months or more, fair value 53,533 32,266
Total, fair value $ 887,216 $ 80,024