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Resale and Repurchase Agreements (Remaining Contractual Maturities of Repurchase Agreements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Maturity Overnight [Member] | US Treasury and Government [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 150,305 $ 526,283
Maturity Overnight [Member] | US Government-sponsored Enterprise Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 32,575
Maturity Overnight [Member] | Agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 1,598,614 973,774
Maturity Overnight [Member] | Non-agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 62,742 71,399
Maturity Overnight [Member] | Asset-backed Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 155,917 60,012
Maturity Overnight [Member] | Other Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 33,668 50,375
Maturity Overnight [Member] | Repurchase Agreements [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 2,001,246 1,714,418
Maturity up to 90 days [Member] | US Treasury and Government [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity up to 90 days [Member] | US Government-sponsored Enterprise Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity up to 90 days [Member] | Agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 34,018 48,517
Maturity up to 90 days [Member] | Non-agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity up to 90 days [Member] | Asset-backed Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 40,000
Maturity up to 90 days [Member] | Other Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity up to 90 days [Member] | Repurchase Agreements [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 34,018 88,517
Maturity Greater than 90 Days [Member] | US Treasury and Government [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity Greater than 90 Days [Member] | US Government-sponsored Enterprise Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity Greater than 90 Days [Member] | Agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 220,849 227,802
Maturity Greater than 90 Days [Member] | Non-agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity Greater than 90 Days [Member] | Asset-backed Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity Greater than 90 Days [Member] | Other Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 0
Maturity Greater than 90 Days [Member] | Repurchase Agreements [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 220,849 227,802
Total Repurchase Agreements [Member] [Domain] | US Treasury and Government [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 150,305 526,283
Total Repurchase Agreements [Member] [Domain] | US Government-sponsored Enterprise Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 0 32,575
Total Repurchase Agreements [Member] [Domain] | Agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 1,853,481 1,250,093
Total Repurchase Agreements [Member] [Domain] | Non-agency mortgage-backed securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 62,742 71,399
Total Repurchase Agreements [Member] [Domain] | Asset-backed Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 155,917 100,012
Total Repurchase Agreements [Member] [Domain] | Other Debt Securities [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 33,668 50,375
Total Repurchase Agreements [Member] [Domain] | Repurchase Agreements [Member]    
Schedule of Underlying Assets of Repurchase Agreements [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 2,256,113 $ 2,030,737