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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 ($)
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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

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