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ACQUISITIONS (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2022
USD ($)
Aug. 02, 2021
USD ($)
Jul. 01, 2021
USD ($)
Jun. 03, 2021
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Oct. 04, 2021
item
Acquisitions [Abstract]                      
Purchase price of acquisition           $ 2,464,000       $ 32,770,000  
Contingent consideration           0       2,900,000  
Goodwill         $ 799,109,000 799,080,000   $ 793,456,000   799,109,000  
Revenue earned           300,000          
Direct expenses           100,000          
Cash           2,464,000   $ 0      
Maximum                      
Acquisitions [Abstract]                      
Contingent consideration   $ 3,400,000                  
NuVantage Insurance, Inc. [Member]                      
Acquisitions [Abstract]                      
Intangibles       $ 1,400,000              
Goodwill       1,400,000              
Revenue earned           300,000          
Direct expenses             $ 300,000   $ 300,000    
Purchase price in cash       $ 2,900,000              
NuVantage Insurance, Inc. [Member] | Maximum | Probability Adjusted Level Of Retained Revenue                      
Acquisitions [Abstract]                      
Contingent consideration, measurement input 2         5,800,000         5,800,000  
NuVantage Insurance, Inc. [Member] | Minimum | Probability Adjusted Level Of Retained Revenue                      
Acquisitions [Abstract]                      
Contingent consideration, measurement input 2         5,600,000         5,600,000  
Fringe Benefits Design of Minnesota, Inc ("FBD") [Member]                      
Acquisitions [Abstract]                      
Purchase price of acquisition                   16,750,000  
Contingent consideration     $ 1,400,000             1,400,000  
Goodwill     2,000,000   $ 2,017,000         $ 2,017,000  
Revenue earned           1,400,000          
Direct expenses           1,100,000          
Cash     $ 15,400,000                
Contingent consideration, measurement input     1.05   1.50         1.50  
Period considered for additional consideration based on future retained revenue     2 years                
Consideration payable term     3 years                
Acquisition-related contingent consideration adjustment         $ 200,000            
Fair value contingent consideration adjustment                   $ 1,600,000  
Fringe Benefits Design of Minnesota, Inc ("FBD") [Member] | Maximum                      
Acquisitions [Abstract]                      
Contingent consideration     $ 2,700,000   2,700,000            
Fringe Benefits Design of Minnesota, Inc ("FBD") [Member] | Maximum | Probability Adjusted Level Of Retained Revenue                      
Acquisitions [Abstract]                      
Contingent consideration, measurement input 2     5,800,000                
Fringe Benefits Design of Minnesota, Inc ("FBD") [Member] | Minimum                      
Acquisitions [Abstract]                      
Contingent consideration     0   0            
Fringe Benefits Design of Minnesota, Inc ("FBD") [Member] | Minimum | Probability Adjusted Level Of Retained Revenue                      
Acquisitions [Abstract]                      
Contingent consideration, measurement input 2     5,600,000                
Fringe Benefits Design of Minnesota, Inc ("FBD") [Member] | Customer Lists [Member]                      
Acquisitions [Abstract]                      
Intangibles     $ 14,000,000                
Thomas Gregory Associates [Member]                      
Acquisitions [Abstract]                      
Purchase price of acquisition $ 2,500,000                 13,120,000  
Contingent consideration   1,500,000               1,500,000  
Intangibles $ 2,500,000                    
Goodwill   2,200,000     $ 2,170,000         2,170,000  
Revenue earned           1,500,000          
Direct expenses           400,000          
Cash   $ 11,600,000                  
Period considered for additional consideration based on future retained revenue   3 years                  
Thomas Gregory Associates [Member] | Within Two Years From Acquisition [Member]                      
Acquisitions [Abstract]                      
Consideration payable term   2 years                  
Thomas Gregory Associates [Member] | Within Three Years From Acquisition [Member]                      
Acquisitions [Abstract]                      
Consideration payable term   3 years                  
Thomas Gregory Associates [Member] | Maximum                      
Acquisitions [Abstract]                      
Contingent consideration                   $ 3,400,000  
Contingent consideration, measurement input   1.09     1.65         1.65  
Thomas Gregory Associates [Member] | Maximum | Probability Adjusted Level Of Retained Revenue                      
Acquisitions [Abstract]                      
Contingent consideration, measurement input 2   $ 3,800,000     $ 3,400,000         $ 3,400,000  
Thomas Gregory Associates [Member] | Minimum                      
Acquisitions [Abstract]                      
Contingent consideration   $ 0               $ 0  
Contingent consideration, measurement input   0.82     1.38         1.38  
Thomas Gregory Associates [Member] | Minimum | Probability Adjusted Level Of Retained Revenue                      
Acquisitions [Abstract]                      
Contingent consideration, measurement input 2   $ 2,300,000     $ 3,000,000         $ 3,000,000  
Thomas Gregory Associates [Member] | Customer Lists [Member]                      
Acquisitions [Abstract]                      
Intangibles   $ 10,900,000                  
Elmira Savings Bank [Member]                      
Acquisitions [Abstract]                      
Number of Branch Locations of Acquiree Bank | item                     12
Purchase price of acquisition           $ 82,800,000