v3.26.1
GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 19 $ 0 $ 91,900
Other Depreciation and Amortization 7,600 3,200  
Amortization of Mortgage Servicing Rights (MSRs) 1,300 $ 900  
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance $ 0    
Core deposits      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets amortization method accelerated basis    
Estimated weighted average life (in years) 9 years 1 month 6 days    
Customer lists      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets amortization method straight-line basis    
Customer lists | Summit Funding Group      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 19,500   20,100
Finite-Lived Intangible Assets, Remaining Amortization Period 7 years 9 months 18 days    
Customer lists | Bannockburn [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 15,800   16,700
Finite-Lived Intangible Assets, Remaining Amortization Period 4 years 4 months 24 days    
Customer lists | Agile Premium Finance      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 2,300   $ 2,300
Finite-Lived Intangible Assets, Remaining Amortization Period 10 years 10 months 24 days