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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Reconciliation of capital amounts [Abstract]        
Total stockholders' equity $ 847,308 $ 843,958 $ 747,726 $ 434,496
Adjustments:        
LESS: Goodwill, net of associated deferred tax liabilities 302,396      
LESS: Certain other intangible assets 40,964      
LESS: Net deferred tax assets from operating loss and tax credit carry-forwards 18,361      
LESS: Net unrealized gains (losses) on available-for-sale securities 17,762      
LESS: Noncontrolling interest 3,603 $ 4,047    
Common Equity Tier 1 464,222      
Long-term borrowings and other instruments qualifying as Tier 1 13,661      
Tier 1 minority interest not included in common equity tier 1 capital 1,894      
Total Tier 1 capital 479,777      
Allowance for loan and lease losses 49,343      
Subordinated debentures (net of issuance costs) 73,807      
Total capital $ 602,927      
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