Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

The table below presents qualitative information for significant assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of March 31, 2020 and December 31, 2019:

	March 31, 2020
					Range		Weighted Average
(In thousands)	Fair Value		Valuation Technique	Unobservable Input	Minimum	Maximum	Weighted Average

Investment securities available-for-sale:
Private label MBS	$	10,300	Discounted cash flows	Discount rate	12.7%	12.7%	12.7%
				Prepayment rate	6.8%	10.3%	7.9%
				Projected Cumulative Loss Rate	2.6%	20.7%	8.9%
Puerto Rico government obligations		2,969	Discounted cash flows	Discount rate	8.1%	8.1%	8.1%
Puerto Rico government obligations		2,969	Discounted cash flows	Prepayment rate	3.0%	3.0%	3.0%


	December 31, 2019
					Range		Weighted
(In thousands)	Fair Value		Valuation Technique	Unobservable Input	Minimum	Maximum	Average

Investment securities available-for-sale:
Private label MBS	$	11,116	Discounted cash flows	Discount rate	13.7%	13.7%	13.7%
				Prepayment rate	6.8%	10.3%	7.9%
				Projected Cumulative Loss Rate	0.0%	7.4%	2.8%
Puerto Rico government obligations		2,974	Discounted cash flows	Discount rate	6.9%	6.9%	6.9%
Puerto Rico government obligations		2,974	Discounted cash flows	Prepayment rate	3.0%	3.0%	3.0%

Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block]

The following table presents the activity in the ACL for debt securities held-to-maturity by major security type for the quarter ended March 31, 2020:

	Puerto Rico
	Municipal Bonds
(In thousands)
Beginning Balance	$	-
Impact of adopting ASC 326		8,134
Addition for securities for which no previous expected
credit losses were recognized (provision for credit losses)		1,134
	$	9,268

Investments Classified by Contractual Maturity Date [Table Text Block]

The amortized cost, gross unrealized gains and losses recorded in OCI, allowance for credit losses, estimated fair value, and weighted-average yield of investment securities available for sale by contractual maturities as of March 31, 2020 were as follows:

		March 31, 2020
		Amortized cost		Gross					Allowance	Fair value
				Unrealized					for Credit			Weighted-
				gains		losses			Losses			average yield %
(Dollars in thousands)

U.S. Treasury securities:
Due within one year		$	7,483	$	99	$	-	$	-	$	7,582	1.65
U.S. government-sponsored
agencies' obligations:
Due within one year			90,002		510		-		-		90,512	1.56
After 1 to 5 years			118,454		1,488		-		-		119,942	2.04
After 5 to 10 years			112,477		978		12		-		113,443	2.06
After 10 years			23,306		2		64		-		23,244	0.65

Puerto Rico government
obligations:
After 5 to 10 years			4,000		361		-		-		4,361	5.12
After 10 years (1)			4,113		-		1,144		-		2,969	6.97

United States and Puerto
Rico government
obligations			359,835		3,438		1,220		-		362,053	1.92
MBS:
Freddie Mac ("FHLMC") certificates:
	Due within one year		100		8		-		-		108	4.87
After 5 to 10 years			76,460		2,426		-		-		78,886	2.15
After 10 years			295,944		10,832		2		-		306,774	2.49
			372,504		13,266		2		-		385,768	2.42

Ginnie Mae ("GNMA") certificates:
After 1 to 5 years			5,808		141		-		-		5,949	3.23
After 5 to 10 years			37,206		970		-		-		38,176	2.74
After 10 years			303,796		15,120		2		-		318,914	3.12
			346,810		16,231		2		-		363,039	3.08
Fannie Mae ("FNMA") certificates:
After 1 to 5 years			19,773		750		-		-		20,523	2.79
After 5 to 10 years			133,479		5,218		-		-		138,697	2.14
After 10 years			540,107		23,238		-		-		563,345	2.61
			693,359		29,206		-		-		722,565	2.52
Collateralized mortgage obligations issued
or guaranteed by the FHLMC, FNMA
and GNMA
After 1 to 5 years			606		-		3		-		603	1.66
After 10 years			86,706		1,290		646		-		87,350	2.50
			87,312		1,290		649		-		87,953	2.49

Private label
After 10 years			15,357		-		4,689		368		10,300	3.45

Total MBS			1,515,342		59,993		5,342		368		1,569,625	2.63
Other
After 1 to 5 years			500		-		-		-		500	2.95

Total investment securities
available for sale		$	1,875,677	$	63,431	$	6,562	$	368	$	1,932,178	2.50
__________

The amortized cost, gross unrealized gains and losses recorded in OCI, estimated fair value, and weighted-average yield of investment securities available for sale by contractual maturities as of December 31, 2019 were as follows:

		December 31, 2019
		Amortized cost		Gross				Fair value
				Unrealized						Weighted-
				gains		losses				average yield%
(Dollars in thousands)

U.S. Treasury securities:
	After 1 to 5 years	$	7,478	$	1	$	-	$	7,479	1.65
U.S. government-sponsored
agencies' obligations:
	Due within one year		93,299		103		106		93,296	1.67
	After 1 to 5 years		142,513		676		52		143,137	2.12
	After 5 to 10 years		63,764		165		150		63,779	2.33
	After 10 years		24,624		-		116		24,508	2.00

Puerto Rico government
obligations:
	After 5 to 10 years		4,000		348		-		4,348	5.12
	After 10 years (1)		4,166		-		1,192		2,974	6.97

United States and Puerto
Rico government
obligations			339,844		1,293		1,616		339,521	2.11

MBS:
FHLMC certificates:
	After 5 to 10 years		81,418		589		228		81,779	2.16
	After 10 years		424,316		3,873		758		427,431	2.50
			505,734		4,462		986		509,210	2.44

GNMA certificates:
	After 1 to 5 years		4,357		45		-		4,402	3.26
	After 5 to 10 years		42,303		607		-		42,910	2.77
	After 10 years		258,944		7,126		500		265,570	3.03
			305,604		7,778		500		312,882	3.00
FNMA certificates:
	After 1 to 5 years		19,779		415		3		20,191	2.79
	After 5 to 10 years		140,599		1,257		641		141,215	2.14
	After 10 years		700,213		9,006		1,208		708,011	2.58
			860,591		10,678		1,852		869,417	2.51
Collateralized mortgage obligations issued
	or guaranteed by the FHLMC,
	FNMA and GNMA:
	After 1 to 5 years		608		-		1		607	2.43
	After 10 years		80,130		362		220		80,272	2.76
			80,738		362		221		80,879	2.75

Private label
	After 10 years		15,997		-		4,881		11,116	3.90

Total MBS			1,768,664		23,280		8,440		1,783,504	2.60


Other
	After 1 to 5 years		500		-		-		500	2.95


Total investment securities
	available for sale	$	2,109,008	$	24,573	$	10,056	$	2,123,525	2.52

Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

Significant assumptions in the valuation of the private label MBS were as follows:

	As of			As of
	March 31, 2020			December 31, 2019
	Weighted	Range		Weighted	Range
	Average	Minimum	Maximum	Average	Minimum	Maximum

Discount rate	12.7%	12.7%	12.7%	13.7%	13.7%	13.7%
Prepayment rate	7.9%	6.8%	10.3%	7.9%	6.8%	10.3%
Projected Cumulative Loss Rate	8.9%	2.6%	20.7%	2.8%	0.0%	7.4%

Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]

Schedule Of Unrealized Loss On Investments [Table Text Block]

The following tables show the Corporation’s held-to-maturity investments’ fair value and gross unrecognized losses, aggregated by investment category and length of time that individual securities had been in a continuous unrecognized loss position, as of March 31, 2020 and December 31, 2019, including debt securities for which an ACL was recorded as of March 31, 2020.

	As of March 31, 2020
	Less than 12 months				12 months or more				Total
			Unrecognized				Unrecognized				Unrecognized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
		(In thousands)
Debt securities:
Puerto Rico Municipal Bonds	$	-	$	-	$	111,162	$	27,372	$	111,162	$	27,372


	As of December 31, 2019
	Less than 12 months				12 months or more				Total
			Unrecognized				Unrecognized				Unrecognized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
		(In thousands)
Debt securities:
Puerto Rico Municipal Bonds	$	-	$	-	$	110,374	$	28,301	$	110,374	$	28,301