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LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
loan
Mar. 31, 2021
USD ($)
loan
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
SBA PPP Loans, Total Originations, Number of Loans | loan       1,620 3,034
SBA PPP Loans, Total Originations       $ 102,200,000 $ 244,800,000
Loans and Leases Receivable, Related Parties, Description At March 31, 2022 and December 31, 2021, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity.     At March 31, 2022 and December 31, 2021, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity.  
Proceeds from the sale of mortgage loans $ 47,771,000 $ 198,799,000      
Gain on sale of mortgage loans (1,132,000) (6,173,000)      
Loans held for sale, at fair value (book value of $6,818 and $5,786, respectively) 6,705,000     $ 5,815,000  
Allowance for Loan and Lease Losses, Period Increase (Decrease) 1,500,000        
Allowance for credit losses 31,770,000     33,256,000 37,865,000
(Credit) provision for loan losses $ (1,236,000)   $ (3,817,000)    
Other industry exposures 0        
Non-Accrual Loans $ 4,452,000     4,327,000  
Loans outstanding 3,534,218,000     3,431,474,000  
Interest lost on nonaccrual loans 46,000 $ 76,000      
Loans and Leases Receivable, Excluded Accrued Interest from Amortized Cost 8,000,000     7,800,000  
Recorded Investment 2,740,000     2,786,000  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0     0  
Loans modified | loan 0 0      
FHLB advances, general debt obligations, pledged collateral $ 1,500,000,000     1,400,000,000  
SBA PPP Loans, 2021 Originations, Outstanding | loan 69        
Financing Receivable, Year One, Originated, Current Fiscal Year $ 269,131,000     1,099,415,000  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year $ 1,057,180,000     557,853,000  
SBA PPP Loans, 2020 Originations, Number of Contracts Outstanding | loan 12        
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year $ 517,396,000     352,013,000  
CARES Act          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
(Credit) provision for loan losses (1,900,000)        
SBA PPP          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses 4,000     19,000 69,000
(Credit) provision for loan losses (15,000)   (50,000)    
Loans outstanding 6,311,000     35,953,000  
Residential real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses 6,476,000     6,133,000 3,474,000
(Credit) provision for loan losses 343,000   2,644,000    
Non-Accrual Loans 2,052,000     2,107,000  
Loans outstanding 1,392,199,000     1,306,447,000  
Mortgage Loans in Process of Foreclosure, Amount 1,200,000     888,000  
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses 4,838,000     4,183,000 6,703,000
(Credit) provision for loan losses 843,000   (1,941,000)    
Non-Accrual Loans 1,045,000     829,000  
Loans outstanding 403,352,000     363,695,000  
Home equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses 1,435,000     1,469,000 2,616,000
(Credit) provision for loan losses (34,000)   (989,000)    
Non-Accrual Loans 1,145,000     1,175,000  
Loans outstanding 209,647,000     210,403,000  
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses 106,000     79,000 $ 393,000
(Credit) provision for loan losses 92,000   $ (235,000)    
Non-Accrual Loans 27,000     32,000  
Loans outstanding 18,819,000     19,516,000  
Fixed Rate Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Proceeds from the sale of mortgage loans 46,600,000 $ 192,600,000      
Gain on sale of mortgage loans (1,100,000) (6,200,000)      
Loans held for sale, at fair value (book value of $6,818 and $5,786, respectively) 6,800,000     5,800,000  
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Recorded Investment 70,000     74,000  
Financing Receivable, Year One, Originated, Current Fiscal Year 32,660,000     91,247,000  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 83,238,000     44,213,000  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 41,657,000     45,835,000  
SBA PPP          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Year One, Originated, Current Fiscal Year 0     35,634,000  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 6,295,000     319,000  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 16,000     0  
Nonoperating Income (Expense) | Fixed Rate Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gain on sale of mortgage loans 142,000 1,100,000      
Unrealized gain (loss) on loans held for sale $ (113,000) $ 29,000,000      
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk (percentage) 14.00%        
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk (percentage) 33.00%        
Substandard [Member] | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0     0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 20,000     339,000  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 313,000     320,000  
Substandard [Member] | SBA PPP          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Year One, Originated, Current Fiscal Year 0     0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0     0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0     0  
Pass [Member] | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Year One, Originated, Current Fiscal Year 32,660,000     91,102,000  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 83,095,000     43,757,000  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 41,233,000     44,925,000  
Pass [Member] | SBA PPP          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Year One, Originated, Current Fiscal Year 0     35,164,000  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 6,295,000     319,000  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 16,000     0  
Performing Financial Instruments [Member] | Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Recorded Investment 2,300,000     2,400,000  
Nonperforming Financial Instruments [Member] | Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Recorded Investment $ 438,000     $ 394,000