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Note 2 - Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Available-for-Sale, Amortized Cost $ 299,707 $ 295,849
Investment securities available for sale, at fair value (amortized cost of $299,707 and $295,849, respectively) 272,985 270,310
Collateralized Mortgage-Backed Securities [Member]    
Due within one year, amortized cost 6,603 4,602
Due within one year, estimated fair value 6,583 4,603
Due after one through five years, amortized cost 3,107 6,912
Due after one through five years, estimated fair value 3,049 6,856
Due after five through ten years, amortized cost 7,157 7,215
Due after five through ten years, estimated fair value 6,936 7,012
Due after ten years, amortized cost 127,246 119,017
Due after ten years, estimated fair value 114,332 106,589
Available-for-Sale, Amortized Cost 144,113 137,746
Investment securities available for sale, at fair value (amortized cost of $299,707 and $295,849, respectively) 130,900 125,060
Investment Securities, Excluding Mortgage Backed Securities [Member]    
Due within one year, amortized cost 1,000 1,000
Due within one year, estimated fair value 971 959
Due after one through five years, amortized cost 23,058 24,082
Due after one through five years, estimated fair value 22,324 23,620
Due after five through ten years, amortized cost 44,894 45,356
Due after five through ten years, estimated fair value 41,019 41,453
Due after ten years, amortized cost 86,642 87,665
Due after ten years, estimated fair value 77,771 79,218
Total investment securities, amortized cost 155,594 158,103
Total investment securities, estimated fair value $ 142,085 $ 145,250