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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Held-to-maturity Securities | $ 1,641,485 | $ 955,542
Threshold Net Book Balance, Individually Evaluated Loans | 1,000 |
Interest Receivable | 76,300 | 93,900
Liability Recorded for Expected Credit Losses on Unfunded Commitments | 28,300 |
Other Assets |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accrued interest receivable for investment securities | 17,000 | 13,100
Interest Receivable | 76,300 | 93,900
Other Liabilities |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Liability Recorded for Expected Credit Losses on Unfunded Commitments | $ 28,300 | $ 43,400

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