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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	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Assets
Debt Securities Available for Sale, at Fair Value	$ 15,813,301	$ 17,648,473
Trading account debt securities, excluding derivatives	42,545	40,321
Mortgage servicing rights	147,311	150,906	$ 167,813	$ 169,777
US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	10,417,513	12,056,255
Obligations of U.S. Government sponsored entities
Assets
Debt Securities Available for Sale, at Fair Value	86,336	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	560,836	586,175
Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	4,748,300	4,876,314
Other
Assets
Debt Securities Available for Sale, at Fair Value	316	350
Recurring
Assets
Debt Securities Available for Sale, at Fair Value	15,813,301	17,648,473
Trading account debt securities, excluding derivatives	42,545	40,321
Equity securities at fair value	21,601	21,327
Mortgage servicing rights	147,311	150,906
Derivatives	9,534	17,966
Total	16,034,292	17,878,993
Liabilities
Derivatives	(12,037)	(16,619)
Total	(12,037)	(16,619)
Recurring \| US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	10,417,513	12,056,255
Trading account debt securities, excluding derivatives	1	7,083
Recurring \| Obligations of U.S. Government sponsored entities
Assets
Debt Securities Available for Sale, at Fair Value	86,336	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	109	633
Recurring \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt Securities Available for Sale, at Fair Value	560,836	586,175
Recurring \| Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	4,748,300	4,876,314
Trading account debt securities, excluding derivatives	38,468	28,556
Recurring \| Other
Assets
Debt Securities Available for Sale, at Fair Value	316	350
Trading account debt securities, excluding derivatives	3,424	3,443
Recurring \| CMO
Assets
Trading account debt securities, excluding derivatives	543	606
Recurring \| Level 1
Assets
Debt Securities Available for Sale, at Fair Value	2,099,856	3,841,715
Trading account debt securities, excluding derivatives	1	7,081
Equity securities at fair value	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Total	2,099,857	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	2,099,856	3,841,715
Trading account debt securities, excluding derivatives	1	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	13,712,268	13,805,576
Trading account debt securities, excluding derivatives	41,649	32,270
Equity securities at fair value	21,601	21,327
Mortgage servicing rights	0	0
Derivatives	9,534	17,966
Total	13,785,052	13,877,139
Liabilities
Derivatives	(12,037)	(16,619)
Total	(12,037)	(16,619)
Recurring \| Level 2 \| US Treasury Securities
Assets
Debt Securities Available for Sale, at Fair Value	8,317,657	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	86,336	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	109	633
Recurring \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt Securities Available for Sale, at Fair Value	560,836	586,175
Recurring \| Level 2 \| Mortgage Backed Securities
Assets
Debt Securities Available for Sale, at Fair Value	4,747,123	4,875,132
Trading account debt securities, excluding derivatives	38,468	28,556
Recurring \| Level 2 \| Other
Assets
Debt Securities Available for Sale, at Fair Value	316	350
Trading account debt securities, excluding derivatives	2,996	3,003
Recurring \| Level 2 \| CMO
Assets
Trading account debt securities, excluding derivatives	76	76
Recurring \| Level 3
Assets
Debt Securities Available for Sale, at Fair Value	1,177	1,182
Trading account debt securities, excluding derivatives	895	970
Equity securities at fair value	0	0
Mortgage servicing rights	147,311	150,906
Derivatives	0	0
Total	149,383	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	1,177	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	428	440	478
Recurring \| Level 3 \| CMO
Assets
Trading account debt securities, excluding derivatives	$ 467	$ 530	$ 595