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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Assets
Debt Securities Available for Sale, at Fair Value	$ 21,177,839	$ 17,648,473
Trading account debt securities, excluding derivatives	33,053	40,321
Mortgage servicing rights	123,552	150,906	$ 150,652	$ 169,777
US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	11,647,591	12,056,255
Obligations of U.S. Government sponsored entities
Assets
Debt Securities Available for Sale, at Fair Value	60,371	122,404
Obligations of Puerto Rico, States and political subdivisions
Assets
Debt Securities Available for Sale, at Fair Value		6,975
Collateralized Mortgage Obligations - Federal agencies
Assets
Debt Securities Available for Sale, at Fair Value	450,306	586,175
Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	9,019,314	4,876,314
Other
Assets
Debt Securities Available for Sale, at Fair Value	257	350
Recurring
Assets
Debt Securities Available for Sale, at Fair Value	21,177,839	17,648,473
Trading account debt securities, excluding derivatives	33,053	40,321
Equity securities at fair value	26,718	21,327
Mortgage servicing rights	123,552	150,906
Derivatives	18,080	17,966
Total	21,379,242	17,878,993
Liabilities
Derivatives	(15,346)	(16,619)
Total	(15,346)	(16,619)
Recurring \| US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	11,647,591	12,056,255
Trading account debt securities, excluding derivatives	4,106	7,083
Recurring \| Obligations of U.S. Government sponsored entities
Assets
Debt Securities Available for Sale, at Fair Value	60,371	122,404
Recurring \| Obligations of Puerto Rico, States and political subdivisions
Assets
Debt Securities Available for Sale, at Fair Value		6,975
Trading account debt securities, excluding derivatives	105	633
Recurring \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt Securities Available for Sale, at Fair Value	450,306	586,175
Recurring \| Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	9,019,314	4,876,314
Trading account debt securities, excluding derivatives	24,944	28,556
Recurring \| Other
Assets
Debt Securities Available for Sale, at Fair Value	257	350
Trading account debt securities, excluding derivatives	3,414	3,443
Recurring \| CMO
Assets
Trading account debt securities, excluding derivatives	484	606
Recurring \| Level 1
Assets
Debt Securities Available for Sale, at Fair Value	3,999,320	3,841,715
Trading account debt securities, excluding derivatives	4,106	7,081
Equity securities at fair value	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Total	4,003,426	3,848,796
Liabilities
Derivatives	0	0
Total	0	0
Recurring \| Level 1 \| US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	3,999,320	3,841,715
Trading account debt securities, excluding derivatives	4,106	7,081
Recurring \| Level 1 \| Obligations of U.S. Government sponsored entities
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Recurring \| Level 1 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Debt Securities Available for Sale, at Fair Value		0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 1 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Recurring \| Level 1 \| Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 1 \| Other
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 1 \| CMO
Assets
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 2
Assets
Debt Securities Available for Sale, at Fair Value	17,177,395	13,805,576
Trading account debt securities, excluding derivatives	28,124	32,270
Equity securities at fair value	26,718	21,327
Mortgage servicing rights	0	0
Derivatives	18,080	17,966
Total	17,250,317	13,877,139
Liabilities
Derivatives	(15,346)	(16,619)
Total	(15,346)	(16,619)
Recurring \| Level 2 \| US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	7,648,271	8,214,540
Trading account debt securities, excluding derivatives	0	2
Recurring \| Level 2 \| Obligations of U.S. Government sponsored entities
Assets
Debt Securities Available for Sale, at Fair Value	60,371	122,404
Recurring \| Level 2 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Debt Securities Available for Sale, at Fair Value		6,975
Trading account debt securities, excluding derivatives	105	633
Recurring \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt Securities Available for Sale, at Fair Value	450,306	586,175
Recurring \| Level 2 \| Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	9,018,190	4,875,132
Trading account debt securities, excluding derivatives	24,944	28,556
Recurring \| Level 2 \| Other
Assets
Debt Securities Available for Sale, at Fair Value	257	350
Trading account debt securities, excluding derivatives	3,001	3,003
Recurring \| Level 2 \| CMO
Assets
Trading account debt securities, excluding derivatives	74	76
Recurring \| Level 3
Assets
Debt Securities Available for Sale, at Fair Value	1,124	1,182
Trading account debt securities, excluding derivatives	823	970
Equity securities at fair value	0	0
Mortgage servicing rights	123,552	150,906
Derivatives	0	0
Total	125,499	153,058
Liabilities
Derivatives	0	0
Total	0	0
Recurring \| Level 3 \| US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3 \| Obligations of U.S. Government sponsored entities
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Recurring \| Level 3 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Debt Securities Available for Sale, at Fair Value		0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Recurring \| Level 3 \| Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	1,124	1,182
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3 \| Other
Assets
Debt Securities Available for Sale, at Fair Value	0	0
Trading account debt securities, excluding derivatives	413	440	456
Recurring \| Level 3 \| CMO
Assets
Trading account debt securities, excluding derivatives	$ 410	$ 530	$ 557