Debt securities available-for-sale (Tables)

6 Months Ended

Jun. 30, 2021

Investments [Abstract]

Debt Securities, Available-For-Sale

		At June 30, 2021
				Gross		Gross				Weighted
		Amortized		unrealized		unrealized		Fair		average
(In thousands)		cost		gains		losses		value		yield
U.S. Treasury securities
	Within 1 year	$	1,723,731	$	15,416	$	1	$	1,739,146	1.78	%
	After 1 to 5 years		6,291,688		192,969		7,302		6,477,355	1.64
	After 5 to 10 years		3,758,768		12,635		8,590		3,762,813	1.09
Total U.S. Treasury securities			11,774,187		221,020		15,893		11,979,314	1.49
Obligations of U.S. Government sponsored entities
	After 1 to 5 years		90		-		-		90	5.63
Total obligations of U.S. Government sponsored entities			90		-		-		90	5.63
Collateralized mortgage obligations - federal agencies
	After 1 to 5 years		858		7		-		865	2.78
	After 5 to 10 years		50,612		947		-		51,559	1.57
	After 10 years		223,593		6,926		21		230,498	2.08
Total collateralized mortgage obligations - federal agencies			275,063		7,880		21		282,922	1.99
Mortgage-backed securities
	Within 1 year		5,543		-		1		5,542	2.71
	After 1 to 5 years		58,649		2,799		11		61,437	2.38
	After 5 to 10 years		625,776		21,805		4		647,577	1.90
	After 10 years		9,390,381		99,205		131,477		9,358,109	1.78
Total mortgage-backed securities			10,080,349		123,809		131,493		10,072,665	1.78
Other
	After 1 to 5 years		167		9		-		176	3.62
Total other			167		9		-		176	3.62
Total debt securities available-for-sale[1]		$	22,129,856	$	352,718	$	147,407	$	22,335,167	1.62	%
[1]	Includes $21.3 billion pledged to secure government and trust deposits, assets sold under agreements to repurchase, credit facilities and loan servicing agreements that the secured parties are not permitted to sell or repledge the collateral, of which $19.9 billion serve as collateral for public funds.

		At December 31, 2020
				Gross		Gross				Weighted
		Amortized		unrealized		unrealized		Fair		average
(In thousands)		cost		gains		losses		value		yield
U.S. Treasury securities
	Within 1 year	$	4,900,055	$	16,479	$	-	$	4,916,534	0.69	%
	After 1 to 5 years		5,007,223		259,399		-		5,266,622	2.05
	After 5 to 10 years		567,367		37,517		-		604,884	1.68
Total U.S. Treasury securities			10,474,645		313,395		-		10,788,040	1.40
Obligations of U.S. Government sponsored entities
	Within 1 year		59,993		101		-		60,094	1.46
	After 1 to 5 years		90		-		-		90	5.64
Total obligations of U.S. Government sponsored entities			60,083		101		-		60,184	1.47
Collateralized mortgage obligations - federal agencies
	After 1 to 5 years		1,388		14		-		1,402	2.97
	After 5 to 10 years		61,229		1,050		-		62,279	1.56
	After 10 years		318,292		10,202		43		328,451	2.04
Total collateralized mortgage obligations - federal agencies			380,909		11,266		43		392,132	1.97
Mortgage-backed securities
	Within 1 year		5,616		56		-		5,672	2.83
	After 1 to 5 years		50,393		1,735		-		52,128	2.35
	After 5 to 10 years		454,880		20,022		6		474,896	1.91
	After 10 years		9,608,860		180,844		1,839		9,787,865	1.94
Total mortgage-backed securities			10,119,749		202,657		1,845		10,320,561	1.94
Other
	After 1 to 5 years		224		11		-		235	3.62
Total other			224		11		-		235	3.62
Total debt securities available-for-sale[1]		$	21,035,610	$	527,430	$	1,888	$	21,561,152	1.66	%
[1]	Includes $18.2 billion pledged to secure government and trust deposits, assets sold under agreements to repurchase, credit facilities and loan servicing agreements that the secured parties are not permitted to sell or repledge the collateral, of which $16.9 billion serve as collateral for public funds.

Debt Securities Available For Sale Unrealized Loss Position Fair Value

	At June 30, 2021
	Less than 12 months				12 months or more				Total
			Gross				Gross				Gross
	Fair		unrealized		Fair		unrealized		Fair		unrealized
(In thousands)	value		losses		value		losses		value		losses
U.S. Treasury securities	$	3,126,340	$	15,893	$	-	$	-	$	3,126,340	$	15,893
Collateralized mortgage obligations - federal agencies		-		-		1,454		21		1,454		21
Mortgage-backed securities		6,916,854		131,483		413		10		6,917,267		131,493
Total debt securities available-for-sale in an unrealized loss position	$	10,043,194	$	147,376	$	1,867	$	31	$	10,045,061	$	147,407

	At December 31, 2020
	Less than 12 months				12 months or more				Total
			Gross				Gross				Gross
	Fair		unrealized		Fair		unrealized		Fair		unrealized
(In thousands)	value		losses		value		losses		value		losses
Collateralized mortgage obligations - federal agencies	$	4,029	$	43	$	-	$	-	$	4,029	$	43
Mortgage-backed securities		886,432		1,834		555		11		886,987		1,845
Total debt securities available-for-sale in an unrealized loss position	$	890,461	$	1,877	$	555	$	11	$	891,016	$	1,888

Schedule of securities aggregate amortized cost exceed 10 percent of stockholders equity

		June 30, 2021				December 31, 2020
(In thousands)	Amortized cost		Fair value		Amortized cost		Fair value
FNMA	$	1,835,170	$	1,910,814	$	2,242,121	$	2,338,897
Freddie Mac		3,598,675		3,581,748		3,616,238		3,675,679