Derivative Financial Instruments - Net Gains (Losses) Recorded in Accumulated Other Comprehensive Income (Loss) (Details) - Interest rate contract - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Cash pledged to secure obligations	$ 1,800		$ 1,800		$ 3,200
Cash Flow Hedging
Derivative [Line Items]
Gain (loss) recognized in OCI, net of tax	(5)	$ 14	336	$ (2,233)
(Gain) loss reclassified from OCI to interest expense, net of tax	206	192	611	42
Net change in unrealized gains (losses) on cash flow hedges	$ 201	$ 206	$ 947	$ (2,191)

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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