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Note 18 - Derivative Instruments - Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Loans, including fees $ 63,875 $ 42,593 $ 189,222 $ 123,551  
Taxable 5,091 4,596 16,108 14,008  
Total amounts in the Consolidated Statements of Income, Short-term Borrowings 2,506 6,706 9,327 19,748  
Designated as Hedging Instrument [Member]          
Loans, including fees 63,875 42,593 189,222 123,551  
Taxable 5,091 4,596 16,108 14,008  
Total amounts in the Consolidated Statements of Income, Short-term Borrowings 2,506 6,706 9,327 19,748  
Mortgage-backed securities, Notional Amount 200,000   200,000   $ 200,000
Mortgage-backed securities, Carrying Amount 200,100   200,100   199,854
Mortgage-backed securities, Fair Value     100   (146)
Designated as Hedging Instrument [Member] | Residential Mortgage-Backed Securities [Member]          
Mortgage-backed securities, Notional Amount 200,000 [1]   200,000 [1]   200,000 [2]
Mortgage-backed securities, Carrying Amount 200,100 [1]   200,100 [1]   199,854 [2]
Mortgage-backed securities, Fair Value     100 [1]   $ (146) [2]
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member] | Interest and Fee Income, Loans and Leases [Member]          
Derivative, Gain (Loss) on Derivative, Net 0 46 0 367  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member] | Interest Income, Securities, Operating, Taxable [Member]          
Derivative, Gain (Loss) on Derivative, Net 150 653 441 1,954  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member] | Interest Expense, Short-Term Borrowings [Member]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest and Fee Income, Loans and Leases [Member]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Income, Securities, Operating, Taxable [Member]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Expense, Short-Term Borrowings [Member]          
Derivative, Gain (Loss) on Derivative, Net $ 0 $ (253) $ 721 $ (785)  
[1] Includes amounts related to residential agency mortgage-backed securities currently designated as the hedged item in a fair value hedge using the portfolio layer method. At June 30, 2025, the amortized cost of the closed portfolios used in these hedging relationships was $281.6 million.
[2] Includes amounts related to residential agency mortgage-backed securities currently designated as the hedged item in a fair value hedge using the portfolio layer method. At December 31, 2024, the amortized cost of the closed portfolios used in these hedging relationships was $296.9 million.