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Note 4 - Investment Securities - Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Securities held-to-maturity, carrying value $ 439,837 $ 473,217
Securities held-to-maturity, gains 1 0
Securities held-to-maturity, losses (31,319) (41,384)
Debt Securities, Held-to-Maturity, Fair Value, Total 408,519 431,833
US Treasury Securities and US Government Agencies Debt Securities [Member]    
Securities held-to-maturity, carrying value 203,259 217,794
Securities held-to-maturity, gains 0 0
Securities held-to-maturity, losses (4,932) (9,166)
Debt Securities, Held-to-Maturity, Fair Value, Total 198,327 208,628
US Government-sponsored Enterprises Debt Securities [Member]    
Securities held-to-maturity, carrying value 26,918 27,507
Securities held-to-maturity, gains 0 0
Securities held-to-maturity, losses (2,457) (2,559)
Debt Securities, Held-to-Maturity, Fair Value, Total 24,461 24,948
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities held-to-maturity, carrying value 209,660 227,916
Securities held-to-maturity, gains 1 0
Securities held-to-maturity, losses (23,930) (29,659)
Debt Securities, Held-to-Maturity, Fair Value, Total $ 185,731 $ 198,257