Investment securities (Tables)

12 Months Ended

Dec. 31, 2017

Available For Sale Securities Text Block

		At December 31, 2017
				Gross		Gross				Weighted
		Amortized		unrealized		unrealized		Fair		average
(In thousands)		cost		gains		losses		value		yield
U.S. Treasury securities
	Within 1 year	$	1,112,791	$	8	$	2,101	$	1,110,698	1.06	%
	After 1 to 5 years		2,550,116		-		26,319		2,523,797	1.55
	After 5 to 10 years		293,579		281		191		293,669	2.24
Total U.S. Treasury securities			3,956,486		289		28,611		3,928,164	1.46
Obligations of U.S. Government sponsored entities
	Within 1 year		276,304		21		818		275,507	1.26
	After 1 to 5 years		336,922		22		3,518		333,426	1.48
Total obligations of U.S. Government sponsored entities			613,226		43		4,336		608,933	1.38
Obligations of Puerto Rico, States and political subdivisions
	After 1 to 5 years		6,668		-		59		6,609	2.30
Total obligations of Puerto Rico, States and political subdivisions			6,668		-		59		6,609	2.30
Collateralized mortgage obligations - federal agencies
	Within 1 year		40		-		-		40	2.60
	After 1 to 5 years		16,972		173		75		17,070	2.90
	After 5 to 10 years		36,186		57		526		35,717	2.31
	After 10 years		914,568		2,789		26,431		890,926	2.01
Total collateralized mortgage obligations - federal agencies			967,766		3,019		27,032		943,753	2.03
Mortgage-backed securities
	Within 1 year		484		8		-		492	4.23
	After 1 to 5 years		14,599		206		211		14,594	3.50
	After 5 to 10 years		339,161		2,390		3,765		337,786	2.21
	After 10 years		4,385,368		19,493		69,071		4,335,790	2.46
Total mortgage-backed securities			4,739,612		22,097		73,047		4,688,662	2.44
Equity securities (without contractual maturity)			1,039		776		-		1,815	8.21
Other
	After 5 to 10 years		789		13		-		802	3.62
Total other			789		13		-		802	3.62
Total investment securities available-for-sale^[1]		$	10,285,586	$	26,237	$	133,085	$	10,178,738	1.96	%
[1]Includes $6.6 billion pledged to secure public 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 $5.6 billion serve as collateral for public funds.

		At December 31, 2016
				Gross		Gross				Weighted
		Amortized		unrealized		unrealized		Fair		average
(In thousands)		cost		gains		losses		value		yield
U.S. Treasury securities
	Within 1 year	$	844,002	$	1,254	$	28	$	845,228	1.00	%
	After 1 to 5 years		1,300,729		214		9,551		1,291,392	1.11
Total U.S. Treasury securities			2,144,731		1,468		9,579		2,136,620	1.06
Obligations of U.S. Government sponsored entities
	Within 1 year		100,050		102		-		100,152	0.98
	After 1 to 5 years		613,293		710		2,505		611,498	1.38
	After 5 to 10 years		200		-		-		200	5.64
Total obligations of U.S. Government sponsored entities			713,543		812		2,505		711,850	1.32
Obligations of Puerto Rico, States and political subdivisions
	After 1 to 5 years		6,419		-		161		6,258	2.89
	After 5 to 10 years		5,000		-		1,550		3,450	3.80
	After 10 years		17,605		-		4,542		13,063	7.09
Total obligations of Puerto Rico, States and political subdivisions			29,024		-		6,253		22,771	5.60
Collateralized mortgage obligations - federal agencies
	Within 1 year		13		-		-		13	1.23
	After 1 to 5 years		18,524		429		28		18,925	2.89
	After 5 to 10 years		39,178		428		61		39,545	2.68
	After 10 years		1,180,686		6,313		23,956		1,163,043	1.99
Total collateralized mortgage obligations - federal agencies			1,238,401		7,170		24,045		1,221,526	2.02
Mortgage-backed securities
	Within 1 year		55		1		-		56	4.76
	After 1 to 5 years		19,960		537		43		20,454	3.86
	After 5 to 10 years		317,185		3,701		1,721		319,165	2.29
	After 10 years		3,805,675		28,772		68,790		3,765,657	2.47
Total mortgage-backed securities			4,142,875		33,011		70,554		4,105,332	2.46
Equity securities (without contractual maturity)			1,246		876		-		2,122	7.94
Other
	Within 1 year		8,539		11		-		8,550	1.78
	After 5 to 10 years		1,004		31		-		1,035	3.62
Total other			9,543		42		-		9,585	1.97
Total investment securities available-for-sale^[1]		$	8,279,363	$	43,379	$	112,936	$	8,209,806	1.94	%
[1]Includes $4.1 billion pledged to secure public 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 $3.4 billion serve as collateral for public funds.

Schedule Of Aggregate Amortized Cost And Fair Value Of Afs By Contractual Maturity [TableTextBlock]

(In thousands)		Amortized cost		Fair value
Within 1 year	$	1,389,619	$	1,386,737
After 1 to 5 years		2,925,277		2,895,496
After 5 to 10 years		669,715		667,974
After 10 years		5,299,936		5,226,716
Total		10,284,547		10,176,923
Equity securities		1,039		1,815
Total investment securities available-for-sale	$	10,285,586	$	10,178,738

Schedule Of Realized Gains Losses [Table Text Block]

	Years ended December 31,
(In thousands)		2017		2016		2015
Gross realized gains	$	346	$	378	$	226
Gross realized losses		(12)		-		(85)
Net realized gains on sale of investment securities available-for-sale	$	334	$	378	$	141

Held To Maturity Securities Text Block

		At December 31, 2017
				Gross		Gross				Weighted
		Amortized		unrealized		unrealized		Fair		average
(In thousands)		cost		gains		losses		value		yield
Obligations of Puerto Rico, States and political subdivisions
	Within 1 year	$	3,295	$	-	$	79	$	3,216	5.96	%
	After 1 to 5 years		15,485		-		4,143		11,342	6.05
	After 5 to 10 years		29,240		-		8,905		20,335	3.89
	After 10 years		44,734		3,834		222		48,346	1.93
Total obligations of Puerto Rico, States and political subdivisions			92,754		3,834		13,349		83,239	3.38
Collateralized mortgage obligations - federal agencies
	After 5 to 10 years		67		4		-		71	5.45
Total collateralized mortgage obligations - federal agencies			67		4		-		71	5.45
Other
	Within 1 year		500		-		7		493	1.96
	After 1 to 5 years		500		-		-		500	2.97
Total other			1,000		-		7		993	2.47
Total investment securities held-to-maturity^[1]		$	93,821	$	3,838	$	13,356	$	84,303	3.37	%
[1]Includes $92.8 million pledged to secure public and trust deposits that the secured parties are not permitted to sell or repledge the collateral.

		At December 31, 2016
				Gross		Gross				Weighted
		Amortized		unrealized		unrealized		Fair		average
(In thousands)		cost		gains		losses		value		yield
Obligations of Puerto Rico, States and political subdivisions
	Within 1 year	$	3,105	$	-	$	1,240	$	1,865	5.90	%
	After 1 to 5 years		14,540		-		5,957		8,583	6.02
	After 5 to 10 years		18,635		-		7,766		10,869	6.20
	After 10 years		59,747		1,368		8,892		52,223	1.91
Total obligations of Puerto Rico, States and political subdivisions			96,027		1,368		23,855		73,540	3.49
Collateralized mortgage obligations - federal agencies
	After 5 to 10 years		74		4		-		78	5.45
Total collateralized mortgage obligations - federal agencies			74		4		-		78	5.45
Other
	Within 1 year		1,000		-		3		997	1.65
	After 1 to 5 years		1,000		-		39		961	2.44
Total other			2,000		-		42		1,958	2.05
Total investment securities held-to-maturity^[1]		$	98,101	$	1,372	$	23,897	$	75,576	3.46	%
[1]Includes $53.1 million pledged to secure public and trust deposits that the secured parties are not permitted to sell or repledge the collateral.

Schedule Of Aggregate Amortized Cost And Fair Value Of Htms By Contractual Maturity [Table Text Block]

(In thousands)		Amortized cost		Fair value
Within 1 year	$	3,795	$	3,709
After 1 to 5 years		15,985		11,842
After 5 to 10 years		29,307		20,406
After 10 years		44,734		48,346
Total investment securities held-to-maturity	$	93,821	$	84,303

Available For Sale Securities Member

Schedule Of Unrealized Loss On Investments Table Text Block

		At December 31, 2017
		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		$	2,608,473	$	14,749	$	1,027,066	$	13,862	$	3,635,539	$	28,611
Obligations of U.S. Government sponsored entities			214,670		1,108		376,807		3,228		591,477		4,336
Obligations of Puerto Rico, States and political
	subdivisions		6,609		59		-		-		6,609		59
Collateralized mortgage obligations - federal agencies			153,336		2,110		595,339		24,922		748,675		27,032
Mortgage-backed securities			1,515,295		12,529		2,652,359		60,518		4,167,654		73,047
Total investment securities available-for-sale in an
	unrealized loss position	$	4,498,383	$	30,555	$	4,651,571	$	102,530	$	9,149,954	$	133,085

		At December 31, 2016
		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		$	1,162,110	$	9,579	$	-	$	-	$	1,162,110	$	9,579
Obligations of U.S. Government sponsored entities			430,273		2,426		3,126		79		433,399		2,505
Obligations of Puerto Rico, States and political
	subdivisions		6,258		161		16,512		6,092		22,770		6,253
Collateralized mortgage obligations - federal agencies			505,503		8,112		339,236		15,933		844,739		24,045
Mortgage-backed securities			3,537,606		70,173		15,113		381		3,552,719		70,554
Total investment securities available-for-sale in an
	unrealized loss position	$	5,641,750	$	90,451	$	373,987	$	22,485	$	6,015,737	$	112,936

Schedule Of Securities Aggregate Amortized Cost Exceed 10 Of Stockholders Equity [Table Text Block]

		2017				2016

(In thousands)	Amortized cost		Fair value		Amortized cost		Fair value
FNMA	$	3,621,537	$	3,572,474	$	3,255,844	$	3,211,443
Freddie Mac		1,358,708		1,335,685		1,381,197		1,361,933

Held To Maturity Securities Member

Schedule Of Unrealized Loss On Investments Table Text Block

		At December 31, 2017
		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
Obligations of Puerto Rico, States and political subdivisions		$	-	$	-	$	35,696	$	13,349	$	35,696	$	13,349
Other			-		-		743		7		743		7
Total investment securities held-to-maturity in an unrealized
	loss position	$	-	$	-	$	36,439	$	13,356	$	36,439	$	13,356

		At December 31, 2016
		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

Obligations of Puerto Rico, States and political subdivisions		$	31,294	$	1,702	$	30,947	$	22,153	$	62,241	$	23,855
Other			491		9		1,217		33		1,708		42
Total investment securities held-to-maturity in an unrealized
	loss position	$	31,785	$	1,711	$	32,164	$	22,186	$	63,949	$	23,897

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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- Definition

Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity.

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