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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Goodwill    
Goodwill, beginning of period $ 304,750 $ 303,457
Additions 106,610 1,293
Goodwill, end of period 411,360 304,750
Core Deposit and Other Intangibles    
Intangible assets, beginning of period 5,869 5,552
Additions 38,939 1,297
Amortization (7,743) (980)
Intangible assets, end of period 37,065 5,869
Total    
Goodwill and intangible assets, beginning of period 310,619 309,009
Additions 145,549 2,590
Amortization (7,743) (980)
Goodwill and intangible assets, end of period $ 448,425 $ 310,619