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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Reconciliation of capital amounts [Abstract]        
Total stockholders' equity $ 871,884 $ 847,308 $ 843,958 $ 747,726
Adjustments:        
LESS: Goodwill, net of associated deferred tax liabilities 300,780      
LESS: Certain other intangible assets 33,572      
LESS: Net deferred tax assets from operating loss and tax credit carry-forwards 22,801      
LESS: Net unrealized gains (losses) on available for sale securities 7,344      
LESS: Noncontrolling interest 1,155 $ 3,603    
ADD: Adoption of Accounting Standards Update 2016-13 8,202      
Common Equity Tier 1 514,434      
Long-term borrowings and other instruments qualifying as Tier 1 13,661      
Tier 1 minority interest not included in common equity Tier 1 capital 747      
Total Tier 1 capital 528,842      
Allowance for credit losses 53,159      
Subordinated debentures (net of issuance costs) 73,980      
Total capital $ 655,981      
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