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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
Dec. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Total Assets   $ 1,851,864,000 $ 1,851,864,000   $ 1,230,610,000  
Deposits   1,535,385,000 1,535,385,000   957,529,000  
Stockholders’ equity $ 44,803,000 194,785,000 194,785,000   137,428,000 $ 122,285,000
Cash paid per share $ 33.33          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 1,865,738          
Loans acquired with credit deterioration   15,410,000 15,410,000      
Goodwill resulting from merger $ 17,959,000 29,290,000 29,290,000   11,331,000  
Accumulated depreciation   1,224,000 1,224,000   $ 1,110,000  
UpState New York Bancorp, Inc. [Member]            
Business Acquisition [Line Items]            
Total Assets       $ 463,800,000    
Deposits       412,800,000    
Stockholders’ equity       $ 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   17,959,000 17,959,000      
Goodwill resulting from merger   17,959,000 17,959,000      
Reduction in goodwill   923,000        
Asset Impairment Charges     0      
UpState New York Bancorp, Inc. [Member] | Core Deposits [Member]            
Business Acquisition [Line Items]            
Finite-Lived Intangible Assets, Gross   409,000 409,000      
Accumulated depreciation   $ 37,000 $ 37,000