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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