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Proposed Acquisition of Upstate New York Bancorp, Inc. (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jan. 08, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Total Assets   $ 1,230,610 $ 1,184,559  
Net loans receivable   916,072 841,730  
Deposits   957,529 946,780  
Stockholders' equity   137,428 $ 122,285 $ 115,739
UpState New York Bancorp, Inc. [Member]        
Business Acquisition [Line Items]        
Total Assets   439,600    
Net loans receivable   380,700    
Deposits   387,900    
Stockholders' equity   $ 46,400    
UpState New York Bancorp, Inc. [Member] | Subsequent Event [Member]        
Business Acquisition [Line Items]        
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      
Termination fee $ 3,200