Note 22 - Disclosures About Fair Value of Financial Instruments - Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	$ 580,543	$ 421,145
US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	125,905	59,579
Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	263,790	267,313
Asset-backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	36,957	27,229
Corporate Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	2,600	0
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	151,291	67,024
Fair Value, Recurring [Member] \| Reported Value Measurement [Member]
Hedged Loans	29,417	0
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	580,543	421,145
Mortgage loans held for sale	19,474	18,179
Derivatives	714	328
Bank owned life insurance	35,197	31,762
Total assets	665,345	471,414
Derivative Liability, Fair Value, Gross Liability, Total	208	23
Total liabilities	208	23
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	125,905	59,579
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	263,790	267,313
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Asset-backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	36,957	27,229
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	2,600	0
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	151,291	67,024
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Hedged Loans	0	0
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Mortgage loans held for sale	0	0
Derivatives	0	0
Bank owned life insurance	0	0
Derivative Liability, Fair Value, Gross Liability, Total	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Asset-backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	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]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Hedged Loans	29,417	0
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	580,543	421,145
Mortgage loans held for sale	19,474	18,179
Derivatives	714	328
Bank owned life insurance	0	0
Total assets	630,148	439,652
Derivative Liability, Fair Value, Gross Liability, Total	208	23
Total liabilities	208	23
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	125,905	59,579
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	263,790	267,313
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Asset-backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	36,957	27,229
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	2,600	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	151,291	67,024
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Hedged Loans	0	0
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Mortgage loans held for sale	0	0
Derivatives	0	0
Bank owned life insurance	35,197	31,762
Total assets	35,197	31,762
Derivative Liability, Fair Value, Gross Liability, Total	0	0
Total liabilities	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]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Asset-backed Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	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]
Available-for-sale securities, at market (amortized cost $570,842 and $420,207, respectively)	$ 0	$ 0

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 portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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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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