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Investment Securities (Schedule of amortized cost, gross unrealized gains and losses and fair values of available for sale securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 104,580 $ 115,080
Gross Unrealized Gains 2,017 613
Gross Unrealized Losses (230) (861)
Fair Value 106,367 114,832
U.S. government agency mortgage-backed securities-residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 92,779 98,842
Gross Unrealized Gains 1,811 464
Gross Unrealized Losses (183) (828)
Fair Value 94,407 98,478
U.S. government agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,016 12,049
Gross Unrealized Gains 168 53
Gross Unrealized Losses (3) (26)
Fair Value 7,181 12,076
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost [1] 1,188 1,384
Gross Unrealized Gains [1] 23 17
Gross Unrealized Losses [1] (5) (5)
Fair Value [1] 1,206 1,396
Corporate Bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,000 2,250
Gross Unrealized Gains 15 25
Gross Unrealized Losses (17) (2)
Fair Value 2,998 2,273
Other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 597 555
Gross Unrealized Gains 0 54
Gross Unrealized Losses (22)  
Fair Value $ 575 $ 609
[1] The issuers of municipal securities are all within New York State.