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Proposed Acquisition of UpState New York Bancorp, Inc. (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Total Assets $ 1,242,291 $ 1,230,610    
Net loans receivable 919,477 916,072    
Deposits 990,160 957,529    
Stockholders' equity $ 142,187 137,428 $ 126,772 $ 122,285
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    
Conversion of shares 0.9390      
Cash paid per share $ 33.33      
Percent exchanged for stock 90.00%      
Percent exchanged for cash 10.00%      
Minimum [Member] | UpState New York Bancorp, Inc. [Member]        
Business Acquisition [Line Items]        
Business Combination, Threshold For Termination 20.00%      
Maximum [Member] | UpState New York Bancorp, Inc. [Member]        
Business Acquisition [Line Items]        
Performance conditions $ 0.67