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Note 3 - Investment Securities - Investment Securities Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Number of investment positions - less than twelve months, available for sale 69 278
Fair value - less than twelve months, available for sale $ 51,565 $ 181,760
Gross unrealized losses - less than twelve months, available for sale $ 830 $ 10,821
Number of investment positions - more than twelve months , available for sale 387 187
Fair value - more than twelve months, available for sale $ 381,416 $ 258,858
Gross unrealized losses - more than twelve months, available for sale $ 41,777 $ 36,023
Number of investment positions, available for sale 456 465
Fair value, available for sale $ 432,981 $ 440,618
Gross unrealized losses, available for sale 42,607 $ 46,844
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 4,748 1,532
Gross unrealized losses - more than twelve months, held to maturity $ 2,252 $ 468
Number of investment positions, held to maturity 4 4
Fair value, held to maturity $ 4,748 $ 5,311
Gross unrealized losses, held to maturity $ 2,252 $ 1,689
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months, available for sale 2 69
Fair value - less than twelve months, available for sale $ 929 $ 27,561
Gross unrealized losses - less than twelve months, available for sale $ 47 $ 2,214
Number of investment positions - more than twelve months , available for sale 95 28
Fair value - more than twelve months, available for sale $ 76,617 $ 56,303
Gross unrealized losses - more than twelve months, available for sale $ 10,397 $ 8,979
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months, available for sale 3 23
Fair value - less than twelve months, available for sale $ 8,421 $ 6,287
Gross unrealized losses - less than twelve months, available for sale $ 125 $ 336
Number of investment positions - more than twelve months , available for sale 24 3
Fair value - more than twelve months, available for sale $ 5,563 $ 257
Gross unrealized losses - more than twelve months, available for sale $ 335 $ 13
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months, available for sale 6 15
Fair value - less than twelve months, available for sale $ 10,604 $ 35,079
Gross unrealized losses - less than twelve months, available for sale $ 167 $ 1,314
Number of investment positions - more than twelve months , available for sale 54 45
Fair value - more than twelve months, available for sale $ 123,746 $ 102,902
Gross unrealized losses - more than twelve months, available for sale $ 11,906 $ 11,848
US Treasury and Government [Member]    
Number of investment positions - less than twelve months, available for sale 4 17
Fair value - less than twelve months, available for sale $ 5,320 $ 31,615
Gross unrealized losses - less than twelve months, available for sale $ 176 $ 997
Number of investment positions - more than twelve months , available for sale 25 13
Fair value - more than twelve months, available for sale $ 73,744 $ 47,117
Gross unrealized losses - more than twelve months, available for sale $ 3,092 $ 2,917
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months, available for sale 54 154
Fair value - less than twelve months, available for sale $ 26,291 $ 81,218
Gross unrealized losses - less than twelve months, available for sale $ 315 $ 5,960
Municipal Notes [Member]    
Number of investment positions - more than twelve months , available for sale 189 98
Fair value - more than twelve months, available for sale $ 101,746 $ 52,279
Gross unrealized losses - more than twelve months, available for sale $ 16,047 $ 12,266
Corporate Note Securities [Member]    
Number of investment positions - less than twelve months, held to maturity 4 3
Fair value - less than twelve months, held to maturity $ 4,748 $ 3,779
Gross unrealized losses - less than twelve months, held to maturity $ 2,252 $ 1,221
Number of investment positions - more than twelve months, held to maturity 4 1
Fair value - more than twelve months, held to maturity   $ 1,532
Gross unrealized losses - more than twelve months, held to maturity   $ 468