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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held-to-maturity Securities	$ 955,542
Accrued interest receivable for investment securities	13,100
Threshold Net Book Balance, Individually Evaluated Loans	1,000
Interest Receivable	93,900
Liability Recorded for Expected Credit Losses on Unfunded Commitments		$ 6,400
Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest Receivable	93,900
Other Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability Recorded for Expected Credit Losses on Unfunded Commitments	$ 43,400

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