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Business Combinations (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | Nov. 01, 2021 | Jan. 07, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  | $ 3,317,047 |  | $ 3,071,148 |  |  |
Deposits |  |  | 2,866,413 |  | 2,610,878 |  |  |
Equity |  |  | 377,524 |  | 350,097 | $ 339,968 |  |
Goodwill |  |  | 45,775 |  | 45,775 |  |  |
Cortland Bank |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  | 799,200 |  |  |  |  |
Gross loans |  |  | 500,000 |  |  |  |  |
Deposits |  |  | 693,000 |  |  |  |  |
Equity |  |  | 83,000 |  |  |  |  |
Cortland Bank | Subsequent Event [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, date of merger agreement | Nov. 01, 2021 |  |  |  |  |  |  |
Maximum percentage of common shares exchanged for company's shares under merger agreement | 75.00% |  |  |  |  |  |  |
Percentage of common shares exchanged for company's cash under merger agreement | 25.00% |  |  |  |  |  |  |
Maple Leaf |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, date of merger agreement |  | Jan. 07, 2020 |  |  |  |  |  |
Shares of stock issued for acquisition |  | 1,398,229 |  |  |  |  |  |
Fair value of total consideration transferred |  | $ 42,977 |  |  |  |  |  |
Goodwill |  | $ 7,574 |  |  |  |  |  |
COMMON STOCK |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity |  |  | $ 208,539 | $ 208,312 | $ 208,763 | $ 208,644 | $ 208,390 | $ 186,345
COMMON STOCK | Cortland Bank | Subsequent Event [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration per share | $ / shares | $ 28.00 |  |  |  |  |  |  |
Shares of stock issued for acquisition | 1.75 |  |  |  |  |  |  |
COMMON STOCK | Maple Leaf |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration per share | $ / shares |  | $ 640.00 |  |  |  |  |  |
Shares of stock issued for acquisition |  | 45.5948 |  |  |  |  |  |
Exercise price of warrants |  | $ 370.00 |  |  |  |  |  |

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