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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Reconciliation of capital amounts [Abstract]        
Total stockholders' equity $ 650,625 $ 645,140 $ 871,884 $ 847,308
Adjustments:        
LESS: Goodwill, net of associated deferred tax liabilities 297,679      
LESS: Certain other intangible assets 21,228      
LESS: Net deferred tax assets from operating loss and tax credit carry-forwards 19,679      
LESS: Net unrealized (losses) on available for sale securities (254,294)      
LESS: Noncontrolling interest (1,005) $ (30)    
ADD: Adoption of Accounting Standards Update 2016-13 2,017      
Common Equity Tier 1 569,355      
Long-term borrowings and other instruments qualifying as Tier 1 13,661      
Tier 1 minority interest not included in common equity Tier 1 capital (826)      
Total Tier 1 capital 582,190      
Allowance for credit losses 47,960      
Subordinated debentures, net of issuance costs 19,591      
Total capital $ 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