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Proposed Acquisition of UpState New York Bancorp, Inc. (Details) - USD ($)
 3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jan. 08, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]              
Total Assets $ 1,354,541,000     $ 1,230,610,000      
Deposits 1,086,238,000     957,529,000      
Stockholders’ equity $ 142,664,000 $ 142,187,000   $ 137,428,000 $ 131,483,000 $ 126,772,000 $ 122,285,000
UpState New York Bancorp, Inc. [Member]              
Business Acquisition [Line Items]              
Total Assets   443,800,000          
Deposits   393,900,000          
Stockholders’ equity   $ 46,500,000          
Conversion of shares     0.9390        
Cash paid per share $ 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