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Note 2 - Securities - Fair Value of Securities Held to Maturity and the Related Gross Unrealized Gains and Losses (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Amortized Cost, held to maturity	$ 425,906
Gross Unrealized Gains, held to maturity	1
Gross Unrealized Losses, held to maturity	(72,006)
Fair Value, held to maturity	353,901
US Treasury and Government [Member]
Amortized Cost, held to maturity	2,966
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(421)
Fair Value, held to maturity	2,545
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost, held to maturity	201,890
Gross Unrealized Gains, held to maturity	1
Gross Unrealized Losses, held to maturity	(39,355)
Fair Value, held to maturity	162,536
Collateralized Mortgage-Backed Securities [Member]
Amortized Cost, held to maturity	200,473
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(29,868)
Fair Value, held to maturity	170,605
Corporate Debt Securities [Member]
Amortized Cost, held to maturity	19,603
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(2,285)
Fair Value, held to maturity	17,318
Asset-Backed Securities [Member]
Amortized Cost, held to maturity	974
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(77)
Fair Value, held to maturity	$ 897

X

- Definition

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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