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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Held-to-maturity Securities | $ 1,189,265 | $ 955,542
Accrued interest receivable for investment securities | 16,000 | 13,100
Threshold Net Book Balance, Individually Evaluated Loans | 1,000 |
Interest Receivable | 82,800 | 93,900
Liability Recorded for Expected Credit Losses on Unfunded Commitments | 31,000 |
Other Assets |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Interest Receivable | 82,800 | 93,900
Other Liabilities |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Liability Recorded for Expected Credit Losses on Unfunded Commitments | $ 31,000 | $ 43,400

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