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Summary of Significant Accounting Policies (New Accounting Pronouncements Adopted) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items]
Allowance for loan losses	$ 541,579	$ 619,983
Retained earnings	$ 4,683,659	$ 4,000,414

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

The cumulative amount of the reporting entity's undistributed earnings or deficit.