Note 1 - Nature of Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Nature of Business and Significant Accounting Policies

Fair value assumptions for stock option grants and stock purchase grants

	2021		2020		2019
Dividend yield		0.55%		0.60% to 0.81%		0.67%
Expected volatility		23.57%		25.49% to 25.70%		28.28%
Risk-free interest rate		1.62%		0.79% to 1.31%		2.90%
Expected life of option grants		6.25 years		6.25 years		6.25 years
Weighted-average grant date fair value	$	10.85	$	10.07	$	11.29

	2021		2020		2019
Dividend yield		0.49% to 0.61%		0.55% to 0.81%		0.69% to 0.75%
Expected volatility		37.51% to 38.65%		24.59% to 36.38%		20.15% to 21.06%
Risk-free interest rate		0% to 0.06%		0.15% to 1.65%		2.02 % to 2.46%
Expected life of purchase grants		3 to 6 months		3 to 6 months		3 to 6 months
Weighted-average grant date fair value	$	7.67	$	6.03	$	4.81

Schedule of accounting standards update and change in accounting principle

	As Reported		Pre-		Impact of
	Under		ASU 2016-13		ASU 2016-13
	ASU 2016-13		Adoption		Adoption
	(dollars in thousands)
Assets:
Allowance for credit losses HTM securities	$	183	$	—	$	183
Loans*:
C&I		—		35,421		(35,421)
C&I - revolving		2,982		—		2,982
C&I - other		29,130		—		29,130
CRE		—		42,161		(42,161)
CRE - owner occupied		8,696		—		8,696
CRE - non owner occupied		11,428		—		11,428
Construction & Land Development		11,999		—		11,999
Multi-family		5,836		—		5,836
Direct financing leases		—		1,764		(1,764)
1-4 family real estate		5,042		—		5,042
Residential real estate		—		3,732		(3,732)
Consumer		1,161		1,298		(137)
Allowance for credit losses on loans		76,274		84,376		(8,102)
Liabilities:
Allowance for credit losses on OBS credit exposures		9,117		—		9,117

*Loan segmentation under ASU 2016-13 follows different methodology where that segmentation is collateral driven, causing certain segments to contain commercial and non-commercial borrowers, whereas pre-ASU 2016-13 segments were borrower driven.