Debt securities available-for-sale (Tables)

9 Months Ended

Sep. 30, 2021

Investments [Abstract]

Debt Securities, Available-For-Sale

		At September 30, 2021
				Gross		Gross				Weighted
		Amortized		unrealized		unrealized		Fair		average
(In thousands)		cost		gains		losses		value		yield
U.S. Treasury securities
	Within 1 year	$	2,044,124	$	14,907	$	2	$	2,059,029	1.43	%
	After 1 to 5 years		9,119,008		165,170		10,487		9,273,691	1.24
	After 5 to 10 years		3,290,414		6,262		12,447		3,284,229	1.12
Total U.S. Treasury securities			14,453,546		186,339		22,936		14,616,949	1.25
Obligations of U.S. Government sponsored entities
	Within 1 year		70		1		-		71	5.63
Total obligations of U.S. Government sponsored entities			70		1		-		71	5.63
Collateralized mortgage obligations - federal agencies
	After 1 to 5 years		527		2		-		529	2.52
	After 5 to 10 years		49,410		842		-		50,252	1.58
	After 10 years		194,123		5,658		71		199,710	2.10
Total collateralized mortgage obligations - federal agencies			244,060		6,502		71		250,491	2.00
Mortgage-backed securities
	Within 1 year		5,513		1		1		5,513	1.98
	After 1 to 5 years		55,423		2,549		9		57,963	2.35
	After 5 to 10 years		667,142		22,843		4		689,981	1.92
	After 10 years		8,815,176		95,593		140,667		8,770,102	1.72
Total mortgage-backed securities			9,543,254		120,986		140,681		9,523,559	1.74
Other
	After 1 to 5 years		148		8		-		156	3.62
Total other			148		8		-		156	3.62
Total debt securities available-for-sale[1]		$	24,241,078	$	313,836	$	163,688	$	24,391,226	1.44	%
[1]	Includes $21.8 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 $20.7 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.

Schedule Of Realized Gain Loss

	For the quarter ended September 30,				Nine months ended September 30,
(In thousands)		2021		2020		2021		2020
Gross realized gains	$	695	$	41	$	695	$	41
Gross realized losses		(672)		-		(672)		-
Net realized gains on sale of debt securities available-for-sale	$	23	$	41	$	23	$	41

Debt Securities Available For Sale Unrealized Loss Position Fair Value

	At September 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	$	4,607,689	$	22,936	$	-	$	-	$	4,607,689	$	22,936
Collateralized mortgage obligations - federal agencies		22,197		56		1,124		15		23,321		71
Mortgage-backed securities		6,743,824		140,671		342		10		6,744,166		140,681
Total debt securities available-for-sale in an unrealized loss position	$	11,373,710	$	163,663	$	1,466	$	25	$	11,375,176	$	163,688

	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

		September 30, 2021				December 31, 2020
(In thousands)	Amortized cost		Fair value		Amortized cost		Fair value
FNMA	$	1,674,044	$	1,747,848	$	2,242,121	$	2,338,897
Freddie Mac		3,417,413		3,394,380		3,616,238		3,675,679