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Acquisition of UpState New York Bancorp, Inc. and USNY Bank. (Narrative) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 07, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 08, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  | $ 2,025,564,000 | $ 1,851,864,000 | $ 2,025,564,000 |  |  |  |  |
Deposits |  | 1,688,941,000 | 1,535,385,000 | 1,688,941,000 |  |  |  |  |
Stockholders’ equity |  | 200,499,000 | 194,785,000 | 200,499,000 | $ 195,107,000 | $ 142,664,000 | $ 142,187,000 |  | $ 137,428,000
Loans acquired with credit deterioration |  | 15,410,000 |  | 15,410,000 |  |  |  |  |
Goodwill resulting from merger |  | $ 29,266,000 | 29,290,000 | $ 29,266,000 |  |  |  |  |
UpState New York Bancorp, Inc. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  | 463,800,000 |  |  |
Deposits |  |  |  |  |  | 412,800,000 |  |  |
Stockholders’ equity | $ 44,803,000 |  |  |  |  | $ 44,800,000 |  |  |
Conversion of shares |  |  |  |  |  |  |  | 0.9390 |
Cash paid per share | $ 33.33 | $ 0.67 |  | $ 0.67 |  |  |  | $ 33.33 |
Percent exchanged for stock |  |  |  |  |  |  |  | 90.00% |
Percent exchanged for cash |  |  |  |  |  |  |  | 10.00% |
Payments to Acquire Businesses, Gross |  |  |  | $ 8,845,198 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 1,865,738 |  |  | 1,865,738 |  |  |  |  |
Loans Acquired Without Evidence Of Deterioration, Unpaid Principal Balance | $ 400,127,000 |  |  |  |  |  |  |  |
Loans Acquired Without Evidence Of Deterioration, Fair Value | 393,580,000 |  |  |  |  |  |  |  |
Loans acquired with credit deterioration | 15,410,000 |  |  |  |  |  |  |  |
Non-accretable difference for credit impaired loans acquired | 5,213,000 |  |  |  |  |  |  |  |
Goodwill and intangible assets |  | $ 17,935,000 |  | $ 17,935,000 |  |  |  |  |
Goodwill resulting from merger | $ 17,935,000 |  |  |  |  |  |  |  |
Reduction in goodwill |  | (24,000) | 923,000 |  |  |  |  |  |
Asset Impairment Charges |  |  |  | 0 |  |  |  |  |
Core deposit intangible |  | 409,000 |  | 409,000 |  |  |  |  |
Accumulated depreciation |  | $ 74,000 |  | $ 74,000 |  |  |  |  |
UpState New York Bancorp, Inc. [Member] | Acquisition-related Costs [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Impact to operations |  |  | $ 0 |  |  |  |  |  |

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