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Note 4 - Investment Securities - Summary of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023) $ 224,612 $ 224,233
Held to maturity securities, gross unrealized gains 0 0
Held to maturity securities, gross unrealized losses (30,639) (27,057)
Held to maturity securities, fair value 193,973 197,176
Available for sale securities, amortized cost 388,415 395,635
Available for sale debt securities, gross unrealized gains 0 1
Available for sale securities, gross unrealized losses (54,011) (51,596)
Available for sale debt security, fair value 334,404 344,040
US Government Agencies Debt Securities [Member]    
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023) 81,656 81,382
Held to maturity securities, gross unrealized gains 0 0
Held to maturity securities, gross unrealized losses (8,682) (7,561)
Held to maturity securities, fair value 72,974 73,821
Available for sale securities, amortized cost 31,201 31,178
Available for sale debt securities, gross unrealized gains 0 0
Available for sale securities, gross unrealized losses (3,770) (3,633)
Available for sale debt security, fair value 27,431 27,545
US States and Political Subdivisions Debt Securities [Member]    
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023) 142,956 142,851
Held to maturity securities, gross unrealized gains 0 0
Held to maturity securities, gross unrealized losses (21,957) (19,496)
Held to maturity securities, fair value 120,999 123,355
Available for sale securities, amortized cost 137,025 138,217
Available for sale debt securities, gross unrealized gains 0 1
Available for sale securities, gross unrealized losses (15,953) (15,421)
Available for sale debt security, fair value 121,072 122,797
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Available for sale securities, amortized cost 220,189 226,240
Available for sale debt securities, gross unrealized gains 0 0
Available for sale securities, gross unrealized losses (34,288) (32,542)
Available for sale debt security, fair value $ 185,901 $ 193,698