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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Loans receivable, allowance for credit losses $ 67,300,000 $ 62,761,000   $ 62,761,000   $ 60,754,000
Troubled debt restructurings internal grading system substandard   1,800,000       2,900,000
TDR loans, Balance   2,986,000   2,986,000   3,851,000
Non-accrual loans for no related allowance amortized cost       2,400,000    
TDR loans evaluated on individual 100,000          
After-tax effect decreased retained earnings 14,200,000          
Troubled debt restructurings returned to accrual status   66,000 $ 96,000 578,000 $ 433,000  
Provision for Loan Losses   2,000,000 (3,000,000) 2,000,000 (3,700,000)  
Provision for Loan Losses   2,000,000.0 3,000,000.0 2,000,000.0 (3,700,000)  
Provision (credit) for unfunded commitments   1,315,000 643,000 3,345,000 (338,000)  
FDIC-acquired loans and remaining Accretable yield           $ 429,000
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans       100,000    
Interest income   0 0 0 0  
Allowance for unfunded commitment            
Provision for Loan Losses   $ 1,300,000 $ (643,000) $ 3,300,000 $ (338,000)  
Allowance for credit losses 8,700,000          
PCI [Member]            
Allowance for credit losses 1,900,000          
Adopted ASC 326 [Member]            
Allowance for credit losses $ 11,600,000