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Note 3 - Investment Securities - Investments in Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Amortized cost, available for sale [1] $ 139,112 [2]   $ 149,041      
Unrealized gains, available for sale 163   14      
Unrealized losses, available for sale 18,137   23,342      
Securities available for sale, at fair value 121,138   125,713 [3]      
AFS, allowance for credit losses 0   0      
AFS, net 121,138   125,713      
Amortized cost, available for sale [1] 139,112 [2]   149,041      
Amortized cost, available for sale 0   0      
Amortized cost, available for sale 121,138   125,713      
Held to maturity securities 21,207          
Fair value, held to maturity 20,251          
HTM, allowance for credit losses 79 $ 81 60 $ 37 $ 127 $ 36
HTM, net 21,128   20,499 [3]      
US States and Political Subdivisions Debt Securities [Member]            
Amortized cost, available for sale [1] 455   500      
Unrealized gains, available for sale 0   0      
Unrealized losses, available for sale 3   13      
Securities available for sale, at fair value 452   487      
AFS, allowance for credit losses 0   0      
AFS, net 452   487      
Amortized cost, available for sale [1] 455   500      
Amortized cost, available for sale 0   0      
Amortized cost, available for sale 452   487      
Held to maturity securities [1] 21,207   20,559      
Unrealized gains, held to maturity 0   1      
Unrealized losses, held to maturity 956   1,628      
Fair value, held to maturity 20,251   18,932      
HTM, allowance for credit losses 79   60      
HTM, net 21,128   20,499      
SBA Pools [Member]            
Amortized cost, available for sale [1] 542   634      
Unrealized gains, available for sale 1   1      
Unrealized losses, available for sale 4   6      
Securities available for sale, at fair value 539   629      
AFS, allowance for credit losses 0   0      
AFS, net 539   629      
Amortized cost, available for sale [1] 542   634      
Amortized cost, available for sale 0   0      
Amortized cost, available for sale 539   629      
Corporate Debt Securities [Member]            
Amortized cost, available for sale [1] 7,047   8,054      
Unrealized gains, available for sale 0   0      
Unrealized losses, available for sale 719   869      
Securities available for sale, at fair value 6,328   7,185      
AFS, allowance for credit losses 0   0      
AFS, net 6,328   7,185      
Amortized cost, available for sale [1] 7,047   8,054      
Amortized cost, available for sale 0   0      
Amortized cost, available for sale 6,328   7,185      
Collateralized Mortgage-Backed Securities [Member]            
Amortized cost, available for sale [1] 131,068   139,853      
Unrealized gains, available for sale 162   13      
Unrealized losses, available for sale 17,411   22,454      
Securities available for sale, at fair value 113,819   117,412      
AFS, allowance for credit losses 0   0      
AFS, net 113,819   117,412      
Amortized cost, available for sale [1] 131,068   139,853      
Amortized cost, available for sale 0   0      
Amortized cost, available for sale $ 113,819   $ 117,412      
[1] Exluded from the amortized cost of securities available for sale are basis adjustments for securities designated in active fair value hedges. Basis adjustments totaled $222 thousand and ($556) thousand as of September 30, 2025 and December 31, 2024, respectively.
[2] Exluded from the amortized cost of securities available for sale are basis adjustments for securities designated in active fair value hedges. Basis adjustments totaled $222 thousand as of September 30, 2025.
[3] Derived from audited consolidated financial statements