Note 8 - Fair Value Measurements - Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale, Total	$ 839,152	$ 897,585
US Treasury and Other US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	13,478	7,221
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	148,854	159,230
Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Total	453,408	461,777
Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale, Total	39,730	46,713
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	2,379	2,575
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	181,303	220,069
Fair Value, Recurring [Member] \| Reported Value Measurement [Member]
Hedged Loans	25,101	28,717
Debt Securities, Available-for-Sale, Total	839,152	897,585
Mortgage loans held for sale	3,555	11,843
Derivative Asset, Subject to Master Netting Arrangement, before Offset	5,146	1,855
Other investments	2,073	2,034
Total assets	875,027	942,034
Derivative instruments	147	0
Total liabilities	147	0
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US Treasury and Other US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	13,478	7,221
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	148,854	159,230
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Total	453,408	461,777
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale, Total	39,730	46,713
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	2,379	2,575
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	181,303	220,069
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, Total	13,478	7,221
Mortgage loans held for sale	0	0
Derivative Asset, Subject to Master Netting Arrangement, before Offset	0	0
Other investments	0	0
Total assets	13,478	7,221
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, Total	13,478	7,221
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, Total	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, Total	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, Total	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, Total	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, Total	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Hedged Loans	25,101	28,717
Debt Securities, Available-for-Sale, Total	825,674	890,364
Mortgage loans held for sale	3,555	11,843
Derivative Asset, Subject to Master Netting Arrangement, before Offset	5,146	1,855
Other investments	0	0
Total assets	859,476	932,779
Derivative instruments	147	0
Total liabilities	147	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, Total	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, Total	148,854	159,230
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, Total	453,408	461,777
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, Total	39,730	46,713
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, Total	2,379	2,575
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, Total	181,303	220,069
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, Total	0	0
Mortgage loans held for sale	0	0
Derivative Asset, Subject to Master Netting Arrangement, before Offset	0	0
Other investments	2,073	2,034
Total assets	2,073	2,034
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, Total	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, Total	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, Total	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, Total	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, Total	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, Total	$ 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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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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