Resale and Repurchase Agreements Remaining Contractual Maturities of Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
U.S. government and federal agency obligations | Overnight and continuous
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 353,708	$ 600,866
U.S. government and federal agency obligations | Up to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	23,631	33,373
U.S. government and federal agency obligations | Greater than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	6,258	9,259
U.S. government and federal agency obligations | Total
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	383,597	643,498
Agency mortgage-backed securities | Overnight and continuous
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,572,433	1,844,652
Agency mortgage-backed securities | Up to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,207	3,908
Agency mortgage-backed securities | Greater than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	209,245	400,250
Agency mortgage-backed securities | Total
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,782,885	2,248,810
Non-agency mortgage-backed securities | Overnight and continuous
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	24,953	32,299
Non-agency mortgage-backed securities | Up to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non-agency mortgage-backed securities | Greater than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non-agency mortgage-backed securities | Total
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	24,953	32,299
Asset-backed securities | Overnight and continuous
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	290,783	422,525
Asset-backed securities | Up to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Asset-backed securities | Greater than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Asset-backed securities | Total
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	290,783	422,525
Other debt securities | Overnight and continuous
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	17,928	32,450
Other debt securities | Up to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other debt securities | Greater than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other debt securities | Total
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	17,928	32,450
Total repurchase agreements, gross amount recognized | Overnight and continuous
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	2,259,805	2,932,792
Total repurchase agreements, gross amount recognized | Up to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	24,838	37,281
Total repurchase agreements, gross amount recognized | Greater than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	215,503	409,509
Total repurchase agreements, gross amount recognized | Total
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 2,500,146	$ 3,379,582