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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Narrative (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
Dec. 31, 2021
USD ($)
investment
method
$ / shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
segment
investment
method
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Aug. 31, 2021
Jul. 31, 2021
USD ($)
Summary of Significant Accounting Policies [Line Items]                  
Number of equity method investments | investment     3   3        
Period past due for loans to be considered as delinquent         90 days        
Total valuation methods used on impaired loans | method     3   3        
Total loans serviced for others     $ 2,800,000   $ 2,800,000 $ 2,900,000      
Other real estate     2,300,000   2,300,000 5,700,000      
Marketing expense         525,000 $ 1,096,000 $ 1,290,000    
Deferred income tax valuation allowance     0   0        
Liability for uncertain tax positions     0   0        
Unrecognized tax benefits     0   $ 0        
Number of reportable segments | segment         3        
Interchecks                  
Summary of Significant Accounting Policies [Line Items]                  
Ownership percentage               16.90%  
Disposal group, disposed of by sale                  
Summary of Significant Accounting Policies [Line Items]                  
Deposits assumed                 $ 163,300,000
Loans of branches held for sale                 $ 57,800,000
Gain on sale of banking centers     10,800,000 $ 10,800,000          
Stock options                  
Summary of Significant Accounting Policies [Line Items]                  
Antidilutive securities (in shares) | shares         0.3 0.5 0.4    
Software                  
Summary of Significant Accounting Policies [Line Items]                  
Estimated useful lives         3 years        
Minimum | Building                  
Summary of Significant Accounting Policies [Line Items]                  
Estimated useful lives         7 years        
Minimum | Furniture, Fixtures And Equipment                  
Summary of Significant Accounting Policies [Line Items]                  
Estimated useful lives         3 years        
Maximum | Building                  
Summary of Significant Accounting Policies [Line Items]                  
Estimated useful lives         40 years        
Maximum | Furniture, Fixtures And Equipment                  
Summary of Significant Accounting Policies [Line Items]                  
Estimated useful lives         10 years        
Subsidiary bank                  
Summary of Significant Accounting Policies [Line Items]                  
FHLB stock     $ 1,800,000   $ 1,800,000 $ 2,800,000      
FHLB stock par value (in dollars per share) | $ / shares     $ 100   $ 100 $ 100      
Flexia                  
Summary of Significant Accounting Policies [Line Items]                  
Payments for software   $ 1,000,000.0              
Flexia                  
Summary of Significant Accounting Policies [Line Items]                  
Ownership interest   80.00%              
Purchase consideration   $ 2,500,000              
Trabian                  
Summary of Significant Accounting Policies [Line Items]                  
Ownership interest 80.00%                
Purchase consideration $ 1,600,000