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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Feb. 29, 2024
Dec. 31, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Aug. 30, 2019
Finite-Lived Intangible Assets [Line Items]                    
Goodwill $ 1,788       $ 4,200 $ 1,788 $ 4,361 $ 758    
Intangible assets amortization           9,487 10,402 11,185    
Other Depreciation and Amortization   $ 13,100         13,400 14,300    
Amortization of Mortgage Servicing Rights (MSRs)           $ 3,600 3,000 $ 3,100    
Goodwill, Purchase Accounting Adjustments     $ 1,800              
Brady Ware Corporate Finance                    
Finite-Lived Intangible Assets [Line Items]                    
Goodwill, Purchase Accounting Adjustments       $ 100            
Core Deposits                    
Finite-Lived Intangible Assets [Line Items]                    
Intangible assets amortization method           accelerated basis        
Estimated weighted average life (in years)   3 years 3 months 18 days       3 years 3 months 18 days        
Customer Lists                    
Finite-Lived Intangible Assets [Line Items]                    
Intangible assets amortization method           straight-line basis        
Estimated weighted average life (in years)                 9 years 5 years 8 months 12 days
Finite-Lived Intangible Assets, Remaining Amortization Period 12 years 2 months 12 days                  
Customer Lists | Bannockburn [Member]                    
Finite-Lived Intangible Assets [Line Items]                    
Finite-Lived Intangible Assets, Net   $ 20,300       $ 20,300 23,900      
Customer Lists | Summit Funding Group                    
Finite-Lived Intangible Assets [Line Items]                    
Finite-Lived Intangible Assets, Net   22,600       22,600 $ 25,100      
Customer Lists | Agile Premium Finance                    
Finite-Lived Intangible Assets [Line Items]                    
Finite-Lived Intangible Assets, Net   $ 2,500       $ 2,500