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Note 4 - Investment Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Unrealized loss position, fair value, less than 12 months $ 1,611 $ 781
Unrealized loss position, unrealized losses, less than 12 months (35) (22)
Unrealized loss position, fair value, more than 12 months 526,766 539,288
Unrealized loss position, unrealized losses, more than 12 months (83,967) (76,470)
Unrealized loss position, fair value 528,377 540,069
Unrealized loss position, unrealized losses $ (84,002) $ (76,492)
Number of securities, less than 12 months 3 2
Number of securities, more than 12 months 415 414
Number of securities 418 416
US Government Agencies Debt Securities [Member]    
Unrealized loss position, fair value, less than 12 months $ 0 $ 0
Unrealized loss position, unrealized losses, less than 12 months 0 0
Unrealized loss position, fair value, more than 12 months 100,405 101,366
Unrealized loss position, unrealized losses, more than 12 months (12,452) (11,194)
Unrealized loss position, fair value 100,405 101,366
Unrealized loss position, unrealized losses $ (12,452) (11,194)
Number of securities 46  
US States and Political Subdivisions Debt Securities [Member]    
Unrealized loss position, fair value, less than 12 months $ 1,611 781
Unrealized loss position, unrealized losses, less than 12 months (35) (22)
Unrealized loss position, fair value, more than 12 months 240,460 244,224
Unrealized loss position, unrealized losses, more than 12 months (37,551) (33,814)
Unrealized loss position, fair value 242,071 245,005
Unrealized loss position, unrealized losses $ (37,586) (33,836)
Number of securities 237  
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Unrealized loss position, fair value, less than 12 months $ 0 0
Unrealized loss position, unrealized losses, less than 12 months 0 0
Unrealized loss position, fair value, more than 12 months 185,901 193,698
Unrealized loss position, unrealized losses, more than 12 months (33,964) (31,462)
Unrealized loss position, fair value 185,901 193,698
Unrealized loss position, unrealized losses $ (33,964) $ (31,462)
Number of securities 135