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Note 3 - Investment Securities - Investment Securities Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Number of investment positions - less than twelve months, available for sale 64 80
Fair value - less than twelve months, available for sale $ 50,929 $ 42,897
Gross unrealized losses - less than twelve months, available for sale $ 699 $ 2,447
Number of investment positions - more than twelve months , available for sale 364 321
Fair value - more than twelve months, available for sale $ 304,000 $ 343,185
Gross unrealized losses - more than twelve months, available for sale $ 29,367 $ 29,618
Number of investment positions, available for sale 428 401
Fair value, available for sale $ 354,929 $ 386,082
Gross unrealized losses, available for sale $ 30,066 $ 32,065
Number of investment positions - more than twelve months, held to maturity 4 4
Fair value - more than twelve months, held to maturity $ 4,591 $ 4,446
Gross unrealized losses - more than twelve months, held to maturity $ 2,409 $ 2,554
Total securities held to maturity 4 4
Fair value, held to maturity $ 4,591 $ 4,446
Gross unrealized losses, held to maturity $ 2,409 $ 2,554
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Number of investment positions - less than twelve months, available for sale 7  
Fair value - less than twelve months, available for sale $ 8,008  
Gross unrealized losses - less than twelve months, available for sale $ 93  
Number of investment positions - more than twelve months , available for sale 93 96
Fair value - more than twelve months, available for sale $ 59,933 $ 72,044
Gross unrealized losses - more than twelve months, available for sale $ 8,261 $ 9,122
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months, available for sale 11 3
Fair value - less than twelve months, available for sale $ 19,211 $ 8,019
Gross unrealized losses - less than twelve months, available for sale $ 215 $ 30
Number of investment positions - more than twelve months , available for sale 22 22
Fair value - more than twelve months, available for sale $ 7,271 $ 4,998
Gross unrealized losses - more than twelve months, available for sale $ 285 $ 293
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months, available for sale 7 3
Fair value - less than twelve months, available for sale $ 4,830 $ 2,754
Gross unrealized losses - less than twelve months, available for sale $ 57 $ 12
Number of investment positions - more than twelve months , available for sale 45 52
Fair value - more than twelve months, available for sale $ 112,046 $ 123,416
Gross unrealized losses - more than twelve months, available for sale $ 4,703 $ 8,695
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months, available for sale 39 74
Fair value - less than twelve months, available for sale $ 18,880 $ 32,124
Gross unrealized losses - less than twelve months, available for sale $ 334 $ 2,405
US Treasury and Government [Member]    
Number of investment positions - more than twelve months , available for sale 8 21
Fair value - more than twelve months, available for sale $ 21,549 $ 63,084
Gross unrealized losses - more than twelve months, available for sale $ 254 $ 1,674
Municipal Notes [Member]    
Number of investment positions - more than twelve months , available for sale 196 130
Fair value - more than twelve months, available for sale $ 103,201 $ 79,643
Gross unrealized losses - more than twelve months, available for sale $ 15,864 $ 9,834
Corporate Note Securities [Member]    
Number of investment positions - more than twelve months, held to maturity 4 4
Fair value - more than twelve months, held to maturity $ 4,591 $ 4,446
Gross unrealized losses - more than twelve months, held to maturity $ 2,409 $ 2,554