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Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized cost	$ 716,754	$ 698,362
Gross unrealized gains	1,966	1,224
Gross unrealized losses	(72,007)	(82,424)
Securities available-for-sale	646,713	617,162
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US Government Agencies Debt Securities [Member]
Amortized cost	100,284	55,898
Gross unrealized gains	596	189
Gross unrealized losses	(10,070)	(10,761)
Securities available-for-sale	90,810	45,326
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member]
Amortized cost	441,794	462,004
Gross unrealized gains	937	620
Gross unrealized losses	(43,496)	(51,433)
Securities available-for-sale	399,235	411,191
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member]
Amortized cost	25,053	25,240
Gross unrealized gains	0	0
Gross unrealized losses	(2,768)	(3,676)
Securities available-for-sale	22,285	21,564
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	143,547	148,795
Gross unrealized gains	422	415
Gross unrealized losses	(15,662)	(16,505)
Securities available-for-sale	128,307	132,705
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Corporate Debt Securities [Member]
Amortized cost	5,000	5,000
Gross unrealized gains	11	0
Gross unrealized losses	0	(27)
Securities available-for-sale	5,011	4,973
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Asset-Backed Securities [Member]
Amortized cost	917	1,260
Gross unrealized gains	0	0
Gross unrealized losses	(11)	(22)
Securities available-for-sale	906	1,238
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Other Debt Obligations [Member]
Amortized cost	159	165
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Securities available-for-sale	159	165
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 0	$ 0

X

- Definition

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).

+ References

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-Section 50
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