Derivative Instruments - Credit Risk (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Other Liabilities	$ 85,618	$ 77,160
Obligation to repay	51,200	41,600
Interest Rate Swap Contracts
Derivative [Line Items]
Fair value of derivative contracts	77,200	67,100
Interest Rate Swap Contracts | Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Securities pledged	0	500
Other Liabilities	$ 919	$ 45