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Acquisition of UpState New York Bancorp, Inc. and USNY Bank. (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 07, 2020
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Total Assets     $ 1,851,864,000 $ 2,068,504,000    
Deposits     1,535,385,000 1,756,793,000    
Stockholders’ equity     194,785,000 205,262,000   $ 137,428,000
Loans acquired with credit deterioration       15,410,000    
Goodwill resulting from merger $ 17,935,000   29,290,000 29,266,000    
Accumulated depreciation     1,224,000 1,347,000    
UpState New York Bancorp, Inc. [Member]            
Business Acquisition [Line Items]            
Total Assets         $ 463,800,000  
Deposits         412,800,000  
Stockholders’ equity $ 44,803,000       $ 44,800,000  
Conversion of shares 0.9390          
Cash paid per share $ 33.33          
Percent exchanged for stock 90.00%          
Percent exchanged for cash 10.00%          
Performance conditions $ 0.67          
Payments to Acquire Businesses, Gross $ 8,845,198          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 1,865,738          
Loans Acquired Without Evidence Of Deterioration, Unpaid Principal Balance $ 400,127,000          
Loans Acquired Without Evidence Of Deterioration, Fair Value 393,580,000          
Credit impaired loans acquired subject to a non-accretable difference 15,410,000          
Non-accretable difference for credit impaired loans acquired $ 5,213,000          
Goodwill and intangible assets       17,935,000    
Goodwill resulting from merger       17,935,000    
Reduction in goodwill   $ 24,000 $ 923,000      
Asset Impairment Charges       0    
UpState New York Bancorp, Inc. [Member] | Core Deposits [Member]            
Business Acquisition [Line Items]            
Finite-Lived Intangible Assets, Gross       409,000    
Accumulated depreciation       $ 108,000