Statement of Condition (Parenthetical) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
ASSETS
AFS Securities, Amortized Cost	[1]	$ 10,010,280	$ 11,000,910
HTM securities - fair value		$ 2,047,354	$ 2,440,288
Stockholders' Equity Attributable to Parent [Abstract]
Capital Stock, Par value Per Share		$ 100	$ 100
Capital Stock, Shares, Issued and Outstanding		18,804,000	30,550,000

[1] Includes adjustments made to the cost basis of an investment for accretion, amortization, OTTI and/or fair value hedge accounting adjustments, and excludes accrued interest receivable of $19.3 million and $24.4 million at September 30, 2020 and December 31, 2019.