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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held-to-maturity Securities	$ 1,214,313	$ 955,542
Accrued interest receivable for investment securities	13,600
Threshold Net Book Balance, Individually Evaluated Loans	1,000
Interest Receivable	89,500
Liability Recorded for Expected Credit Losses on Unfunded Commitments	35,800
Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest Receivable	89,500
Other Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability Recorded for Expected Credit Losses on Unfunded Commitments	$ 35,800

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