Changes in carrying values of goodwill and intangible assets (Details) - Other Intangible Assets [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill (1)
Balance, beginning of period	$ 13,815	$ 13,815	$ 13,815
Additions
Impairment
Balance, end of period	13,815	13,815	13,815
Core deposit intangibles
Cost, beginning of period	5,881	5,881	5,881
Cost, end of period	5,881	5,881	5,881
Amortization, beginning of period	(5,463)	(5,207)	(4,886)
Amortization	(191)	(256)	(321)
Amortization, end of period	(5,654)	(5,463)	(5,207)
Core deposit intangibles, net	$ 227	$ 418	$ 674