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, 2021	Dec. 31, 2020
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	$ 897,585	$ 580,543
US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	159,230	125,905
Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	461,777	263,790
US Treasury and Other US Government Agencies Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	7,221
Asset-backed Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	46,713	36,957
Corporate Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	2,575	2,600
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	220,069	151,291
Fair Value, Recurring [Member] \| Reported Value Measurement [Member]
Hedged Loans	28,875	29,842
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	897,585	580,543
Mortgage loans held for sale	11,843	19,474
Derivatives	1,855	714
Other investments	2,034
Total assets	942,192	630,573
Derivative Liability, Fair Value, Gross Liability, Total	0	208
Total liabilities	0	208
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	159,230	125,905
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	461,777	263,790
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US Treasury and Other US Government Agencies Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	7,221
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Asset-backed Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	46,713	36,957
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	2,575	2,600
Fair Value, Recurring [Member] \| Reported Value Measurement [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	220,069	151,291
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 $906,135 and $570,842, respectively)	7,221	0
Mortgage loans held for sale	0	0
Derivatives	0	0
Other investments	0
Total assets	7,221	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 $906,135 and $570,842, 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 $906,135 and $570,842, respectively)	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]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	7,221
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 $906,135 and $570,842, 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 $906,135 and $570,842, 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 $906,135 and $570,842, respectively)	0	0
Fair Value, Recurring [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Hedged Loans	28,875	29,842
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	890,364	580,543
Mortgage loans held for sale	11,843	19,474
Derivatives	1,855	714
Other investments	0
Total assets	932,937	630,573
Derivative Liability, Fair Value, Gross Liability, Total	0	208
Total liabilities	0	208
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 $906,135 and $570,842, respectively)	159,230	125,905
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 $906,135 and $570,842, respectively)	461,777	263,790
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]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	0
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 $906,135 and $570,842, respectively)	46,713	36,957
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 $906,135 and $570,842, respectively)	2,575	2,600
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 $906,135 and $570,842, respectively)	220,069	151,291
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 $906,135 and $570,842, respectively)	0	0
Mortgage loans held for sale	0	0
Derivatives	0	0
Other investments	2,034
Total assets	2,034	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 3 [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, 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 $906,135 and $570,842, respectively)	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]
Available-for-sale securities, at market (amortized cost $906,135 and $570,842, respectively)	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 $906,135 and $570,842, 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 $906,135 and $570,842, 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 $906,135 and $570,842, respectively)	$ 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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