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