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Acquisition of UpState New York Bancorp, Inc. and USNY Bank (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 07, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Total Assets |  | $ 1,851,864,000 | $ 1,851,864,000 |  | $ 1,230,610,000 |
Deposits |  | 1,535,385,000 | 1,535,385,000 |  | 957,529,000 |
Stockholders’ equity | $ 44,803,000 | 194,785,000 | 194,785,000 |  | 137,428,000 | $ 122,285,000
Cash paid per share | $ 33.33 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 1,865,738 |  |  |  |  |
Loans acquired with credit deterioration |  | 15,410,000 | 15,410,000 |  |  |
Goodwill resulting from merger | $ 17,959,000 | 29,290,000 | 29,290,000 |  | 11,331,000 |
Accumulated depreciation |  | 1,224,000 | 1,224,000 |  | $ 1,110,000 |
UpState New York Bancorp, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total Assets |  |  |  | $ 463,800,000 |  |
Deposits |  |  |  | 412,800,000 |  |
Stockholders’ equity |  |  |  | $ 44,800,000 |  |
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 |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 8,845,198 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 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 |  |  |  |  |
Credit impaired loans acquired subject to a non-accretable difference | 15,410,000 |  |  |  |  |
Non-accretable difference for credit impaired loans acquired | $ 5,213,000 |  |  |  |  |
Goodwill and intangible assets |  | 17,959,000 | 17,959,000 |  |  |
Goodwill resulting from merger |  | 17,959,000 | 17,959,000 |  |  |
Reduction in goodwill |  | 923,000 |  |  |  |
Asset Impairment Charges |  |  | 0 |  |  |
UpState New York Bancorp, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 409,000 | 409,000 |  |  |
Accumulated depreciation |  | $ 37,000 | $ 37,000 |  |  |

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