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Acquisition of UpState New York Bancorp, Inc. and USNY Bank (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 07, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 08, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total Assets |  | $ 1,842,107,000 | $ 1,842,107,000 |  |  | $ 1,230,610,000 |  |  |
Deposits |  | 1,515,922,000 | 1,515,922,000 |  |  | 957,529,000 |  |  |
Stockholders’ equity |  | 190,547,000 | 190,547,000 | $ 142,664,000 |  | 137,428,000 | $ 134,894,000 | $ 131,483,000 | $ 122,285,000
Loans acquired with credit deterioration |  | 15,410,000 | 15,410,000 |  |  |  |  |  |
Goodwill resulting from merger |  | $ 30,213,000 | $ 30,213,000 |  |  | $ 11,331,000 |  |  |
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 |  | $ 19,291,000 | $ 19,291,000 |  |  |  |  |  |
Goodwill resulting from merger | $ 18,882,000 | 18,882,000 | 18,882,000 |  |  |  |  |  |
Asset Impairment Charges |  |  | 0 |  |  |  |  |  |
Core deposit intangible |  | 409,000 | 409,000 |  |  |  |  |  |
Accumulated depreciation |  | $ 19,000 | $ 19,000 |  |  |  |  |  |

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