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Derivative Instruments - Hedged assets and liabilities in fair value (Details) - Designated as hedging instruments
$ in Thousands
Sep. 30, 2023
USD ($)
Derivative Instruments  
Notional amount $ 600,000
Carrying Amount of Hedged Assets / Liabilities 596,077
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities (3,923)
Mortgage backed securities - Residential agency  
Derivative Instruments  
Notional amount 200,000
Carrying Amount of Hedged Assets / Liabilities 196,793
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities (3,207)
Amortized cost 331,000
Mortgage Loan Pools  
Derivative Instruments  
Notional amount 400,000
Carrying Amount of Hedged Assets / Liabilities 399,284
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities (716)
Amortized cost $ 706,800