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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Held-to-maturity Securities $ 1,819,901 $ 955,542  
Interest Receivable 70,600 93,900  
Liability Recorded for Expected Credit Losses on Unfunded Commitments     $ 6,400
Other Assets      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued interest receivable for investment securities 19,200 13,100  
Interest Receivable 70,600 93,900  
Other Liabilities      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Liability Recorded for Expected Credit Losses on Unfunded Commitments $ 30,500 $ 43,400