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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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