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Note 3 - Investment Securities - Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Securities held-to-maturity, carrying value	$ 478,125	$ 0
Securities held-to-maturity, gains	2
Securities held-to-maturity, losses	(44,756)
Debt Securities, Held-to-Maturity, Fair Value, Total	433,371	$ 0
US Treasury Securities and US Government Agencies Debt Securities [Member]
Securities held-to-maturity, carrying value	217,684
Securities held-to-maturity, gains	0
Securities held-to-maturity, losses	(9,673)
Debt Securities, Held-to-Maturity, Fair Value, Total	208,011
US Government-sponsored Enterprises Debt Securities [Member]
Securities held-to-maturity, carrying value	27,666
Securities held-to-maturity, gains	2
Securities held-to-maturity, losses	(2,498)
Debt Securities, Held-to-Maturity, Fair Value, Total	25,170
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities held-to-maturity, carrying value	232,775
Securities held-to-maturity, gains	0
Securities held-to-maturity, losses	(32,585)
Debt Securities, Held-to-Maturity, Fair Value, Total	$ 200,190

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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- Definition

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

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