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Acquisition of UpState New York Bancorp, Inc. and USNY Bank. (Future Amortization Expense) (Details) - UpState New York Bancorp, Inc. [Member]
$ in Thousands
Sep. 30, 2021
USD ($)
Business Acquisition [Line Items]  
2021 $ 17
2022 63
2023 56
2024 48
2025 41
After five years 93
Amortization Expense for the Core Deposit Intangible, Total $ 318