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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Reconciliation of capital amounts [Abstract]        
Total stockholders' equity $ 839,605 $ 650,625 $ 645,140 $ 871,884
Adjustments:        
LESS: Goodwill, net of associated deferred tax liabilities 296,105 297,679    
LESS: Certain other intangible assets 18,018 21,228    
LESS: Net deferred tax assets from operating loss and tax credit carry-forwards 13,253 19,679    
LESS: Net unrealized (losses) on available for sale securities (152,328) (254,294)    
LESS: Noncontrolling interest (277) (1,005)    
ADD: Adoption of Accounting Standards Update 2016-13 1,345 2,017    
Common Equity Tier 1 666,179 569,355    
Long-term borrowings and other instruments qualifying as Tier 1 13,661 13,661    
Tier 1 minority interest not included in common equity Tier 1 capital (150) (826)    
Total Tier 1 capital 679,690 582,190    
Allowance for credit losses 44,687 47,960    
Subordinated debentures, net of issuance costs 19,693 19,591    
Total capital $ 774,070 $ 649,741    
Common Equity Tier 1, risk-based (as a percent) 0.070      
Tier 1 risk-based (as a percent) 0.085      
Total risk based capital ratios with buffer (as a percent) 0.105      
Capital conservation buffer requirement 0.025