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Note 4 - Investment Securities - Summary of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023)	$ 224,612	$ 224,233
Held to maturity securities, gross unrealized gains	0	0
Held to maturity securities, gross unrealized losses	(30,639)	(27,057)
Held to maturity securities, fair value	193,973	197,176
Available for sale securities, amortized cost	388,415	395,635
Available for sale debt securities, gross unrealized gains	0	1
Available for sale securities, gross unrealized losses	(54,011)	(51,596)
Available for sale debt security, fair value	334,404	344,040
US Government Agencies Debt Securities [Member]
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023)	81,656	81,382
Held to maturity securities, gross unrealized gains	0	0
Held to maturity securities, gross unrealized losses	(8,682)	(7,561)
Held to maturity securities, fair value	72,974	73,821
Available for sale securities, amortized cost	31,201	31,178
Available for sale debt securities, gross unrealized gains	0	0
Available for sale securities, gross unrealized losses	(3,770)	(3,633)
Available for sale debt security, fair value	27,431	27,545
US States and Political Subdivisions Debt Securities [Member]
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023)	142,956	142,851
Held to maturity securities, gross unrealized gains	0	0
Held to maturity securities, gross unrealized losses	(21,957)	(19,496)
Held to maturity securities, fair value	120,999	123,355
Available for sale securities, amortized cost	137,025	138,217
Available for sale debt securities, gross unrealized gains	0	1
Available for sale securities, gross unrealized losses	(15,953)	(15,421)
Available for sale debt security, fair value	121,072	122,797
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Available for sale securities, amortized cost	220,189	226,240
Available for sale debt securities, gross unrealized gains	0	0
Available for sale securities, gross unrealized losses	(34,288)	(32,542)
Available for sale debt security, fair value	$ 185,901	$ 193,698

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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