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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 |  |  |

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