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Fair value of financial instruments (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($) Office security	Sep. 30, 2025 USD ($) Office security	Dec. 31, 2024 USD ($) Office
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate amortized cost	$ 568,633	$ 568,633	$ 575,288
Available for sale, Fair Value	534,521	534,521	526,329
Fair value of assets transfers into level 3	0	0
Fair value of assets transfers out of level 3	0	0
Fair value of liabilities transfers into level 3	0	0
Fair value of liabilities transfers out of level 3	0	0
Other real estate owned	$ 1,500	$ 1,500
Number of commercial properties | Office	1	1
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available for sale, Fair Value	$ 1,972	$ 1,972	4,622
Level 3 | Other Assets.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	2,700	2,700	738
Level 3 | Former community banking office | Other Assets.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Other real estate owned	$ 433	$ 433	$ 711
Number of former community banking office properties | Office			1
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Corporate debt securities | security	31	31
Aggregate amortized cost	$ 23,515	$ 23,515	$ 31,442
Available for sale, Fair Value	$ 23,907	$ 23,907	$ 31,621
Corporate debt securities | Market Not Active
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Corporate debt securities | security	2	2
Aggregate amortized cost	$ 1,800	$ 1,800
Available for sale, Fair Value	$ 2,000	$ 2,000
Corporate debt securities | Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Corporate debt securities | security	2	2
Change in the fair value of Level 3		$ (2,600)
Number of securities redeemed | security		1
Fair value of redeemed security		$ 2,700
Aggregate increase in the fair value		$ 100

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