Changes in the carrying values of goodwill and intangible assets (Details) - Other Intangible Assets [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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
Additions
Cost, end of period	5,881	5,881	5,881
Amortization, beginning of period	(4,886)	(4,498)	(4,044)
Amortization	(321)	(388)	(454)
Amortization, end of period	(5,207)	(4,886)	(4,498)
Core deposit intangibles, net	$ 674	$ 995	$ 1,383