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Summary of Significant Accounting Policies - Schedule of Intangible Assets (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
USD ($)
Goodwill  
Goodwill, beginning balance $ 411,360
Additions 3,363
Goodwill, ending balance 414,723
Core Deposit and Other Intangibles  
Core deposit and other intangibles, beginning balance 37,065
Additions 180
Amortization (2,755)
Core deposit and other intangibles, ending balance 34,490
Total  
Total, beginning balance 448,425
Additions 3,543
Amortization (2,755)
Total, ending balance $ 449,213