Income Tax (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized tax position	$ 0	$ 0
Interest and penalties on unrecognized tax benefits	0	0
Federal operating loss carryforwards, set to begin to expire in 2024	9,900
Idaho state operating loss carryforwards, set to begin to expire in 2024	5,400
State operating loss carryforwards, set to begin to expire in 2024	25
Proportional amortization as a component of income tax expense	1,800	916	$ 622
Affordable Housing Tax Credits and Other Tax Benefits, Amount	2,000	1,200	$ 738
Low-income housing tax credit investments	47,200	24,000
Qualified Affordable Housing Project Investments, Commitment	$ 41,300	$ 19,200