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Available for Sale Securities (Schedule of gross unrealized losses and fair value, securities in continuous unrealized loss position) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months Fair Value | $ 36,851 | $ 1,669
Less Than 12 Months Unrealized Losses | (309) | (4)
12 Months or Longer Fair Value | 34,253 | 96,025
12 Months or Longer Unrealized Losses | (552) | (3,269)
Fair Value | 71,104 | 97,694
Unrealized Losses | (861) | (3,273)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
12 Months or Longer Fair Value |  | 2,971
12 Months or Longer Unrealized Losses |  | (65)
Fair Value |  | 2,971
Unrealized Losses |  | (65)
U.S. government agency mortgage-backed securities-residential |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months Fair Value | 35,612 | 1,669
Less Than 12 Months Unrealized Losses | (302) | (4)
12 Months or Longer Fair Value | 27,252 | 76,586
12 Months or Longer Unrealized Losses | (526) | (2,753)
Fair Value | 62,864 | 78,255
Unrealized Losses | (828) | (2,757)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
12 Months or Longer Fair Value | 7,001 | 16,468
12 Months or Longer Unrealized Losses | (26) | (451)
Fair Value | 7,001 | 16,468
Unrealized Losses | (26) | $ (451)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months Fair Value | 490 |
Less Than 12 Months Unrealized Losses | (5) |
Fair Value | 490 |
Unrealized Losses | (5) |
Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months Fair Value | 749 |
Less Than 12 Months Unrealized Losses | (2) |
Fair Value | 749 |
Unrealized Losses | $ (2) |

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