Note 8 - Fair Value Measurements - Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale	$ 799,841	$ 822,812
US Treasury and Other US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale	6,540	6,497
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale	149,358	145,212
Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale	414,542	444,438
Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale	42,886	45,250
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	2,381	2,403
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	184,134	179,012
Fair Value, Recurring [Member] \| Reported Value Measurement [Member]
Hedged Loans	25,624	25,452
Debt Securities, Available-for-Sale	799,841	822,812
Mortgage loans held for sale	5,389	3,355
Derivative Asset, Subject to Master Netting Arrangement, before Offset	4,643	4,705
Other investments	2,047	1,965
Total assets	837,544	858,289
Derivative instruments	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US Treasury and Other US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale	6,540	6,497
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale	149,358	145,212
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale	414,542	444,438
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale	42,886	45,250
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	2,381	2,403
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	184,134	179,012
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Hedged Loans	0	0
Debt Securities, Available-for-Sale	6,540	6,497
Mortgage loans held for sale	0	0
Derivative Asset, Subject to Master Netting Arrangement, before Offset	0	0
Other investments	0	0
Total assets	6,540	6,497
Derivative instruments	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Treasury and Other US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale	6,540	6,497
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Hedged Loans	25,624	25,452
Debt Securities, Available-for-Sale	793,301	816,315
Mortgage loans held for sale	5,389	3,355
Derivative Asset, Subject to Master Netting Arrangement, before Offset	4,643	4,705
Other investments	0	0
Total assets	828,957	849,827
Derivative instruments	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Treasury and Other US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale	149,358	145,212
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale	414,542	444,438
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale	42,886	45,250
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	2,381	2,403
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	184,134	179,012
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Hedged Loans	0	0
Debt Securities, Available-for-Sale	0	0
Mortgage loans held for sale	0	0
Derivative Asset, Subject to Master Netting Arrangement, before Offset	0	0
Other investments	2,047	1,965
Total assets	2,047	1,965
Derivative instruments	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Treasury and Other US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	$ 0	$ 0

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of hedged loans.

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