Note 3 - Investment Securities - Investment Securities Continuous Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Number of investment positions - less than twelve months, available for sale	278	122
Fair value - less than twelve months, available for sale	$ 181,760	$ 247,386
Gross unrealized losses - less than twelve months, available for sale	$ 10,821	$ 3,341
Number of investment positions - more than twelve months , available for sale	187	9
Fair value - more than twelve months, available for sale	$ 258,858	$ 17,990
Gross unrealized losses - more than twelve months, available for sale	$ 36,023	$ 456
Number of investment positions, available for sale	465	131
Fair value, available for sale	$ 440,618	$ 265,376
Gross unrealized losses, available for sale	$ 46,844	$ 3,797
Number of investment positions - less than twelve months, held to maturity	3
Fair value - less than twelve months, held to maturity	$ 3,779
Gross unrealized losses - less than twelve months, held to maturity	1,221
Fair value - more than twelve months, held to maturity	1,532
Gross unrealized losses - more than twelve months, held to maturity	$ 468
Number of investment positions, held to maturity	4
Fair value, held to maturity	$ 5,311
Gross unrealized losses, held to maturity	$ 1,689
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Number of investment positions - less than twelve months, available for sale	69	23
Fair value - less than twelve months, available for sale	$ 27,561	$ 67,512
Gross unrealized losses - less than twelve months, available for sale	$ 2,214	$ 607
Number of investment positions - more than twelve months , available for sale	28	1
Fair value - more than twelve months, available for sale	$ 56,303	$ 1,357
Gross unrealized losses - more than twelve months, available for sale	$ 8,979	$ 28
US Government Agencies Debt Securities [Member]
Number of investment positions - less than twelve months, available for sale	15	39
Fair value - less than twelve months, available for sale	$ 35,079	$ 98,042
Gross unrealized losses - less than twelve months, available for sale	$ 1,314	$ 1,710
Number of investment positions - more than twelve months , available for sale	45	4
Fair value - more than twelve months, available for sale	$ 102,902	$ 13,676
Gross unrealized losses - more than twelve months, available for sale	$ 11,848	$ 324
Agency Collateralized Mortgage Obligations [Member]
Number of investment positions - less than twelve months, available for sale	23
Fair value - less than twelve months, available for sale	$ 6,287
Gross unrealized losses - less than twelve months, available for sale	$ 336
Number of investment positions - more than twelve months , available for sale	3
Fair value - more than twelve months, available for sale	$ 257
Gross unrealized losses - more than twelve months, available for sale	$ 13
US Treasury and Government [Member]
Number of investment positions - less than twelve months, available for sale	17	11
Fair value - less than twelve months, available for sale	$ 31,615	$ 49,190
Gross unrealized losses - less than twelve months, available for sale	$ 997	$ 545
Number of investment positions - more than twelve months , available for sale	13
Fair value - more than twelve months, available for sale	$ 47,117
Gross unrealized losses - more than twelve months, available for sale	$ 2,917
US States and Political Subdivisions Debt Securities [Member]
Number of investment positions - less than twelve months, available for sale	154	49
Fair value - less than twelve months, available for sale	$ 81,218	$ 32,642
Gross unrealized losses - less than twelve months, available for sale	$ 5,960	$ 479
Municipal Notes [Member]
Number of investment positions - more than twelve months , available for sale	98	4
Fair value - more than twelve months, available for sale	$ 52,279	$ 2,957
Gross unrealized losses - more than twelve months, available for sale	$ 12,266	$ 104
Corporate Note Securities [Member]
Number of investment positions - less than twelve months, held to maturity	3
Fair value - less than twelve months, held to maturity	$ 3,779
Gross unrealized losses - less than twelve months, held to maturity	$ 1,221
Number of investment positions - more than twelve months, held to maturity	1
Fair value - more than twelve months, held to maturity	$ 1,532
Gross unrealized losses - more than twelve months, held to maturity	$ 468