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

The tables below present qualitative information for significant assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of June 30, 2020 and December 31, 2019:

	June 30, 2020
	Fair Value		Valuation Technique	Unobservable Input	Range		Weighted Average
(Dollars in thousands)	Fair Value		Valuation Technique	Unobservable Input	Minimum	Maximum	Weighted Average

Investment securities available-for-sale:

Private label MBS	$	9,190	Discounted cash flows	Discount rate	12.5%	12.5%	12.5%
				Prepayment rate	6.8%	10.3%	7.9%
				Projected cumulative loss rate	0.7%	23.3%	9.8%

Puerto Rico government obligations		2,953	Discounted cash flows	Discount rate	8.5%	8.5%	8.5%
				Projected cumulative loss rate	15.9%	15.9%	15.9%



	December 31, 2019
	Fair Value		Valuation Technique	Unobservable Input	Range		Weighted Average
(Dollars in thousands)	Fair Value		Valuation Technique	Unobservable Input	Minimum	Maximum	Weighted 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%
				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 and six-month period ended June 30, 2020:

	Puerto Rico Municipal Bonds
	Quarter Ended		Six-Month Period Ended
	June 30, 2020		June 30, 2020

(In thousands)
Beginning Balance	$	9,268	$	-
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	$	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 June 30, 2020 were as follows:

		June 30, 2020
		Amortized cost						Allowance for Credit Losses		Fair value
				Gross Unrealized								Weighted-
				gains		losses						average yield%
(Dollars in thousands)

U.S. Treasury securities:
	Due within one year	$	7,488	$	63	$	-	$	-	$	7,551	1.65

U.S. government-sponsored
agencies' obligations:
Due within one year			71,575		261		-		-		71,836	1.47
After 1 to 5 years			394,687		1,668		-		-		396,355	1.22
After 5 to 10 years			142,319		559		28		-		142,850	1.67
After 10 years			22,584		-		138		-		22,446	0.65

Puerto Rico government obligations:
After 5 to 10 years			4,000		264		-		-		4,264	5.12
After 10 years (1)			4,067		-		806		308		2,953	6.97

United States and Puerto Rico
government obligations			646,720		2,815		972		308		648,255	1.39

MBS:
Freddie Mac (“FHLMC”) certificates:
Due within one year			93		8		-		-		101	4.87
After 5 to 10 years			72,260		2,911		-		-		75,171	2.16
After 10 years			497,187		13,150		38		-		510,299	2.12
			569,540		16,069		38		-		585,571	2.12

Ginnie Mae (“GNMA”) certificates:
After 1 to 5 years			17,565		615		-		-		18,180	3.28
After 5 to 10 years			21,762		586		-		-		22,348	2.41
After 10 years			396,062		13,283		86		-		409,259	2.75
			435,389		14,484		86		-		449,787	2.76
Fannie Mae (“FNMA”) certificates:
After 1 to 5 years			19,768		730		-		-		20,498	2.79
After 5 to 10 years			127,095		6,475		-		-		133,570	2.15
After 10 years			670,163		24,612		42		-		694,733	2.31
			817,026		31,817		42		-		848,801	2.29
Collateralized mortgage obligations
issued or guaranteed by the FHLMC,					`
FNMA and GNMA:
After 1 to 5 years			584		-		1		-		583	0.83
After 5 to 10 years			20,060		114		-		-		20,174	2.34
After 10 years			159,146		1,307		143		-		160,310	1.92
			179,790		1,421		144		-		181,067	1.96
Private label:
After 10 years			14,814		-		4,301		1,323		9,190	2.28
Total MBS			2,016,559		63,791		4,611		1,323		2,074,416	2.32

Other
After 1 to 5 years			500		-		-		-		500	2.96

Total investment securities
available for sale		$	2,663,779	$	66,606	$	5,583	$	1,631	$	2,723,171	2.09

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 Unrealized				Fair value
				Gross 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

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
	June 30, 2020			December 31, 2019
	Weighted	Range		Weighted	Range
	Average	Minimum	Maximum	Average	Minimum	Maximum

Discount rate	12.5%	12.5%	12.5%	13.7%	13.7%	13.7%
Prepayment rate	7.9%	6.8%	10.3%	7.9%	6.8%	10.3%
Projected Cumulative Loss Rate	9.8%	0.7%	23.3%	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 June 30, 2020 and December 31, 2019, including debt securities for which an ACL was recorded as of June 30, 2020:

	As of June 30, 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	$	-	$	-	$	108,646	$	29,887	$	108,646	$	29,887


	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