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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Reconciliation of capital amounts [Abstract]        
Total stockholders' equity $ 857,454 $ 822,189 $ 618,347 $ 633,211
Adjustments:        
LESS: Goodwill, net of associated deferred tax liabilities 285,158 296,105    
LESS: Certain other intangible assets 18,077 18,018    
LESS: Net deferred tax assets from operating loss and tax credit carry-forwards 5,733 15,624    
LESS: Net unrealized (losses) on available for sale securities (143,190) (152,328)    
LESS: Noncontrolling interest (591) (277)    
ADD: Adoption of Accounting Standards Update 2016-13 1,788 3,576    
Common Equity Tier 1 694,055 648,623    
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 (307) (150)    
Total Tier 1 capital 707,409 662,134    
Allowance for credit losses 52,455 66,140    
Subordinated debentures, net of issuance costs 19,796 19,693    
Total capital $ 779,660 $ 747,967    
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