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Balance Sheet Offsetting Balance Sheet Offsetting - Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items]    
Remaining contractual maturity of the agreements overnight and continuous $ 1,842,618 $ 2,740,799
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 0 0
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total 1,842,618 2,740,799
Securities Sold under Agreements to Repurchase, Gross 1,842,618 2,740,799
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 0 0
US Treasury Securities [Member]    
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items]    
Remaining contractual maturity of the agreements overnight and continuous 876,879 1,342,591
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 0 0
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total 876,879 1,342,591
Residential Mortgage Backed Securities [Member]    
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items]    
Remaining contractual maturity of the agreements overnight and continuous 965,739 1,398,208
Remaining contractual maturity of the agreements up to 30 Days 0 0
Remaining contractual maturity of the agreements 30 to 90 Days 0 0
Remaining contractual maturity of the agreements greater than 90 Days 0 0
Remaining contractual maturity of the agreements total $ 965,739 $ 1,398,208