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Note 1 - Nature of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Nature of Business and Significant Accounting Policies |
Fair value assumptions for stock option grants and stock purchase grants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020 | ​
Dividend yield | ​ | ​ | 0.43% to 0.45% | ​ | ​ | 0.55% | ​ | ​ | 0.60% to 0.81% | ​
Expected volatility |  | ​ | 22.65% to 23.52% | ​ | ​ | 23.57% | ​ | ​ | 25.49% to 25.70% | ​
Risk-free interest rate |  | ​ | 1.87% to 3.12% | ​ | ​ | 1.62% | ​ | ​ | 0.79% to 1.31% | ​
Expected life of option grants |  | ​ | 6.25 years | ​ | ​ | 6.25 years | ​ | ​ | 6.25 years | ​
Weighted-average grant date fair value | ​ | $ | 13.94 to 15.09 | ​ | $ | 10.85 | ​ | $ | 10.07 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020 | ​
Dividend yield | ​ |  | 0.43% to 0.44% | ​ | ​ | 0.49% to 0.61% | ​ | ​ | 0.55% to 0.81% | ​
Expected volatility | ​ |  | 17.97% to 21.16% | ​ | ​ | 37.51% to 38.65% | ​ | ​ | 24.59% to 36.38% | ​
Risk-free interest rate | ​ |  | 0.14% to 2.24% | ​ | ​ | 0% to 0.06% | ​ | ​ | 0.15% to 1.65% | ​
Expected life of purchase grants | ​ |  | 3 to 6 months | ​ | ​ | 3 to 6 months | ​ | ​ | 3 to 6 months | ​
Weighted-average grant date fair value | ​ | $ | 7.88 | ​ | $ | 7.67 | ​ | $ | 6.03 | ​
​
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.

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126900757&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=126900757&loc=d3e725-108305 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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