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Acquisition of UpState New York Bancorp, Inc. and USNY Bank (Narrative) (Details) - USD ($)
 3 Months Ended
Jul. 07, 2020
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 08, 2020
Dec. 31, 2019
Business Acquisition [Line Items]              
Total Assets   $ 2,009,836,000 $ 1,851,864,000        
Deposits   1,685,188,000 1,535,385,000        
Stockholders’ equity   195,107,000 194,785,000   $ 142,187,000   $ 137,428,000
Loans acquired with credit deterioration   15,410,000          
Goodwill resulting from merger   $ 29,290,000 29,290,000        
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 $ 0.67       $ 33.33  
Percent exchanged for stock           90.00%  
Percent exchanged for cash           10.00%  
Payments to Acquire Businesses, Gross   $ 8,845,198          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 1,865,738 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            
Loans acquired with credit deterioration 15,410,000            
Non-accretable difference for credit impaired loans acquired 5,213,000            
Goodwill and intangible assets   $ 17,959,000          
Goodwill resulting from merger $ 17,959,000 17,959,000          
Reduction in goodwill     923,000        
Asset Impairment Charges   0          
Core deposit intangible   409,000          
Accumulated depreciation   $ 56,000          
UpState New York Bancorp, Inc. [Member] | Acquisition-related Costs [Member]              
Business Acquisition [Line Items]              
Impact to operations     $ 0