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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Premises and Equipment) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
branch
loan
machine
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Accounting Policies [Line Items]          
Investments in unconsolidated subsidiaries accounted for under the equity methods $ 0.1   $ 0.1 $ 0.1  
Intangible assets       1.5  
Impairment, Intangible Asset, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed, Flag impairment        
Impairment of intangible assets $ 1.3        
Proportional amortization investments 48.7   48.7 37.8  
Investments in unconsolidated subsidiaries accounted for under the cost methods $ 3.6   $ 3.6 $ 3.6  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable   Accrued interest receivable Accrued interest receivable  
Available for sale accrued interest receivable $ 3.6   $ 3.6 $ 2.8  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable   Accrued interest receivable Accrued interest receivable  
Held-to-maturity accrued interest receivable $ 1.1   $ 1.1 $ 1.2  
Number of types of loans held for sale | loan     2    
Accrued interest receivable on loans $ 17.5   $ 17.5 $ 17.1  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable   Accrued interest receivable Accrued interest receivable  
Maximum | Office buildings and improvements          
Accounting Policies [Line Items]          
Useful life 39 years   39 years    
Maximum | Equipment          
Accounting Policies [Line Items]          
Useful life 7 years   7 years    
Minimum | Office buildings and improvements          
Accounting Policies [Line Items]          
Useful life 5 years   5 years    
Minimum | Equipment          
Accounting Policies [Line Items]          
Useful life 1 year   1 year    
Swell Financial, Inc.          
Accounting Policies [Line Items]          
Proceeds from intellectual property rights and platform usage fees from products     $ 1.5    
Swell Financial, Inc. | Maximum          
Accounting Policies [Line Items]          
Proceeds from sale of equity method in investment securities $ 0.5 $ 0.5      
Proceeds from intellectual property rights and platform usage fees from products   $ 1.5      
Gentry Home Loans LLC          
Accounting Policies [Line Items]          
Ownership interest 50.00%   50.00%    
Island Pacific HomeLoans, LLC          
Accounting Policies [Line Items]          
Ownership interest 50.00%   50.00%    
Haseko Home Loans LLC          
Accounting Policies [Line Items]          
Ownership interest 50.00%   50.00%    
JAM FINTOP Banktech Fund, L.P.          
Accounting Policies [Line Items]          
Investments in unconsolidated subsidiaries accounted for under the equity methods         $ 2.0
Central Bank          
Accounting Policies [Line Items]          
Number of branches | branch     27    
Number of ATMs | machine     55