SECURED BORROWINGS (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Repurchase Agreements [Abstract]

Schedule of Secured Borrowings

Secured borrowings (and related pledged collateral, including accrued interest receivable), classified by collateral type and remaining maturities, and related weighted average borrowing rates as of the indicated dates were as follows (dollars in thousands): 

Collateral Type	Collateral Carrying Amount		Accrued Interest Receivable		Borrowings Outstanding		Average Borrowing Rates
December 31, 2020
Borrowings under repurchase arrangements    secured by Agency securities with    maturities of 30 days or less	$	5,249,989	$	12,597	$	4,972,181		0.21	%
Borrowings under repurchase arrangements    secured by Agency securities with    maturities of 31 to 90 days		1,939,034		4,225		1,846,902		0.20
Borrowings under repurchase arrangements    secured by Agency securities with    maturities greater than 90 days		522,969		1,167		500,000		0.29
	$	7,711,992	$	17,989	$	7,319,083		0.21
December 31, 2019
Borrowings under repurchase arrangements    secured by Agency securities with    maturities of 30 days or less	$	9,484,275	$	27,826	$	9,002,527		2.12	%
Borrowings under repurchase arrangements    secured by Agency securities with    maturities of 31 to 90 days		1,344,437		3,742		1,271,971		1.98
	$	10,828,712	$	31,568	$	10,274,498		2.10