Long-term borrowings (Details Textual) - USD ($)				1 Months Ended
	Nov. 01, 2021	Jan. 07, 2020	Dec. 31, 2015	Nov. 30, 2021	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-rem advances from FHLB					$ 0	$ 0
Residential mortgage, commercial real estate, and multi-family loans					1,700,000,000	$ 1,200,000,000
Additional borrowing limit					$ 707,800,000
Subordinated Notes
Debt Instrument [Line Items]
Aggregate principal amount				$ 75,000,000
Maturity date				Dec. 15, 2031
Fixed rate				3.125%
Notes maturity term				5 years
Basis spread on variable rate				220.00%
Net proceeds from sale				$ 73,800,000
Junior Subordinated Debt Securities | Cortland Bank
Debt Instrument [Line Items]
Maturity date	Sep. 15, 2037
Business acquisition, date of merger agreement	Nov. 01, 2021
Acquisition-date fair value	$ 4,300,000
Interest rate, effective percentage					7.00%	6.22%
Junior Subordinated Debt Securities | Cortland Bank | 3-month LIBOR Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.45%
Junior Subordinated Debt Securities | Maple Leaf
Debt Instrument [Line Items]
Maturity date		Dec. 15, 2036
Business acquisition, date of merger agreement		Jan. 07, 2020
Interest rate, effective percentage					7.35%	6.57%
Junior Subordinated Debt Securities | Maple Leaf | 3-month LIBOR Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.80%
Junior Subordinated Debt Securities | National Bancshares Corporation
Debt Instrument [Line Items]
Maturity date			Jun. 15, 2035
Interest rate, effective percentage					7.25%	6.47%
Junior Subordinated Debt Securities | National Bancshares Corporation | 3-month LIBOR Rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.70%