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Resale and Repurchase Agreements (Tables)
 9 Months Ended
Sep. 30, 2021
Resale and Repurchase Agreements [Abstract]  
Resale and Repurchase Agreements [Table Text Block]
Gross Amounts Not Offset in the Balance Sheet
(In thousands)Gross Amount RecognizedGross Amounts Offset in the Balance SheetNet Amounts Presented in the Balance SheetFinancial Instruments Available for OffsetSecurities Collateral Received/PledgedNet Amount
September 30, 2021
Total resale agreements, subject to master netting arrangements
$1,950,000 $(200,000)$1,750,000 $— $(1,750,000)$— 
Total repurchase agreements, subject to master netting arrangements
2,442,408 (200,000)2,242,408 — (2,242,408)— 
December 31, 2020
Total resale agreements, subject to master netting arrangements
$1,050,000 $(200,000)$850,000 $— $(850,000)$— 
Total repurchase agreements, subject to master netting arrangements
2,256,113 (200,000)2,056,113 — (2,056,113)— 
Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]
Remaining Contractual Maturity of the Agreements
(In thousands)Overnight and continuousUp to 90 daysGreater than 90 daysTotal
September 30, 2021
Repurchase agreements, secured by:
  U.S. government and federal agency obligations$273,267 $25,106 $19,942 $318,315 
  Agency mortgage-backed securities1,640,466 3,775 209,759 1,854,000 
  Non-agency mortgage-backed securities31,217 — — 31,217 
  Asset-backed securities205,729 — — 205,729 
  Other debt securities33,147 — — 33,147 
   Total repurchase agreements, gross amount recognized$2,183,826 $28,881 $229,701 $2,442,408 
December 31, 2020
Repurchase agreements, secured by:
  U.S. government and federal agency obligations$150,305 $— $— $150,305 
  Agency mortgage-backed securities1,598,614 34,018 220,849 1,853,481 
  Non-agency mortgage-backed securities62,742 — — 62,742 
  Asset-backed securities155,917 — — 155,917 
  Other debt securities33,668 — — 33,668 
   Total repurchase agreements, gross amount recognized$2,001,246 $34,018 $220,849 $2,256,113