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Fair value of financial instruments - Carrying or notional amounts and estimated fair values for financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Financial Assets:
Cash and due from banks	$ 528,590	$ 428,433
Money market investments	9,687,356	17,536,719
Debt securities available-for-sale	26,266,251	24,968,269
Debt securities held-to-maturity	1,656,520	71,365
Equity securities:
Equity securities, at lower of cost or realizable value	175,870	189,977
Loans held in portfolio	29,689,186	28,545,191
Mortgage servicing rights	129,877	121,570	$ 119,467	$ 118,395
Deposits
Time deposits	7,095,522	6,712,149
Deposits	65,327,664	67,005,088
Assets sold under agreements to repurchase	70,925	91,603
Other short-term borrowings	0	75,000
Notes payable:
Notes payable	888,210	988,563
US Treasury Securities
Financial Assets:
Debt securities available-for-sale	18,840,482	15,859,030
Debt securities held-to-maturity	1,588,746
Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	61,790	65,380
Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities available-for-sale	172,784	221,265
Debt securities held-to-maturity	24	25
Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,960
Other
Financial Assets:
Debt securities available-for-sale	595	128
Carrying amount
Financial Assets:
Cash and due from banks	528,590	428,433
Money market investments	9,687,356	17,536,719
Trading account debt securities, excluding derivatives	32,317	29,711
Debt securities available-for-sale	26,266,251	24,968,269
Debt securities held-to-maturity	1,656,520	71,365
Equity securities:
FHLB stock	49,595	59,918
FRB stock	94,691	96,217
Other investments	31,584	33,842
Equity securities, at lower of cost or realizable value	175,870	189,977
Loans held-for-sale	28,546	59,168
Loans held in portfolio	29,689,186	28,545,191
Mortgage servicing rights	129,877	121,570
Derivatives	17,218	26,093
Deposits
Demand deposits	58,232,142	60,292,939
Time deposits	7,095,522	6,712,149
Deposits	65,327,664	67,005,088
Assets sold under agreements to repurchase	70,925	91,603
Other short-term borrowings		75,000
Notes payable:
FHLB advances	391,429	492,429
Unsecured senior debt securities	298,475	297,842
Junior subordinated deferrable interest debentures (related to trust preferred securities)	198,306	198,292
Notes payable	888,210	988,563
Derivatives	16,173	22,878
Contingent consideration	9,241	9,241
Carrying amount \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	1,588,746
Carrying amount \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	61,790	65,380
Carrying amount \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	24	25
Carrying amount \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,960
Fair Value
Financial Assets:
Cash and due from banks	528,590	428,433
Money market investments	9,687,356	17,536,719
Trading account debt securities, excluding derivatives	32,317	29,711
Debt securities available-for-sale	26,266,251	24,968,269
Debt securities held-to-maturity	1,649,561	83,368
Equity securities:
FHLB stock	49,595	59,918
FRB stock	94,691	96,217
Other investments	32,411	36,210
Equity securities, at lower of cost or realizable value	176,697	192,345
Loans held-for-sale	29,008	59,885
Loans held in portfolio	28,385,203	27,489,583
Mortgage servicing rights	129,877	121,570
Derivatives	17,218	26,093
Deposits
Demand deposits	58,232,142	60,292,939
Time deposits	6,813,156	6,647,301
Deposits	65,045,298	66,940,240
Assets sold under agreements to repurchase	70,991	91,602
Other short-term borrowings		75,000
Notes payable:
FHLB advances	371,908	496,091
Unsecured senior debt securities	305,052	319,296
Junior subordinated deferrable interest debentures (related to trust preferred securities)	197,151	201,879
Notes payable	874,111	1,017,266
Derivatives	16,173	22,878
Contingent consideration	9,241	9,241
Fair Value \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	1,577,586
Fair Value \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	65,991	77,383
Fair Value \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	24	25
Fair Value \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,960
Fair Value \| Level 1
Financial Assets:
Cash and due from banks	528,590	428,433
Money market investments	9,680,569	17,530,640
Trading account debt securities, excluding derivatives	16,873	6,530
Debt securities available-for-sale	2,019,437	0
Debt securities held-to-maturity	0	0
Equity securities:
FHLB stock	0	0
FRB stock	0	0
Other investments	0	0
Equity securities, at lower of cost or realizable value	0	0
Loans held-for-sale	0	0
Loans held in portfolio	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Deposits
Demand deposits	0	0
Time deposits	0	0
Deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings		0
Notes payable:
FHLB advances	0	0
Unsecured senior debt securities	0	0
Junior subordinated deferrable interest debentures (related to trust preferred securities)	0	0
Notes payable	0	0
Derivatives	0	0
Contingent consideration	0	0
Fair Value \| Level 1 \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	0
Fair Value \| Level 1 \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 1 \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 1 \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 2
Financial Assets:
Cash and due from banks	0	0
Money market investments	6,787	6,079
Trading account debt securities, excluding derivatives	15,028	22,703
Debt securities available-for-sale	24,245,535	24,967,443
Debt securities held-to-maturity	1,583,546	5,960
Equity securities:
FHLB stock	49,595	59,918
FRB stock	94,691	96,217
Other investments	28,214	32,429
Equity securities, at lower of cost or realizable value	172,500	188,564
Loans held-for-sale	0	0
Loans held in portfolio	0	0
Mortgage servicing rights	0	0
Derivatives	17,218	26,093
Deposits
Demand deposits	58,232,142	60,292,939
Time deposits	6,813,156	6,647,301
Deposits	65,045,298	66,940,240
Assets sold under agreements to repurchase	70,991	91,602
Other short-term borrowings		75,000
Notes payable:
FHLB advances	371,908	496,091
Unsecured senior debt securities	305,052	319,296
Junior subordinated deferrable interest debentures (related to trust preferred securities)	197,151	201,879
Notes payable	874,111	1,017,266
Derivatives	16,173	22,878
Contingent consideration	0	0
Fair Value \| Level 2 \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	1,577,586
Fair Value \| Level 2 \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 2 \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,960
Fair Value \| Level 3
Financial Assets:
Cash and due from banks	0	0
Money market investments	0	0
Trading account debt securities, excluding derivatives	416	478
Debt securities available-for-sale	1,279	826
Debt securities held-to-maturity	66,015	77,408
Equity securities:
FHLB stock	0	0
FRB stock	0	0
Other investments	3,982	3,704
Equity securities, at lower of cost or realizable value	3,982	3,704
Loans held-for-sale	29,008	59,885
Loans held in portfolio	28,385,203	27,489,583
Mortgage servicing rights	129,877	121,570
Derivatives	0	0
Deposits
Demand deposits	0	0
Time deposits	0	0
Deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings		0
Notes payable:
FHLB advances	0	0
Unsecured senior debt securities	0	0
Junior subordinated deferrable interest debentures (related to trust preferred securities)	0	0
Notes payable	0	0
Derivatives	0	0
Contingent consideration	9,241	9,241
Fair Value \| Level 3 \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	0
Fair Value \| Level 3 \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	65,991	77,383
Fair Value \| Level 3 \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	24	25
Fair Value \| Level 3 \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| NAV
Financial Assets:
Cash and due from banks	0	0
Money market investments	0	0
Trading account debt securities, excluding derivatives	0	0
Debt securities available-for-sale	0	0
Debt securities held-to-maturity	0	0
Equity securities:
FHLB stock	0	0
FRB stock	0	0
Other investments	215	77
Equity securities, at lower of cost or realizable value	215	77
Loans held-for-sale	0	0
Loans held in portfolio	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Deposits
Demand deposits	0	0
Time deposits	0	0
Deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings		0
Notes payable:
FHLB advances	0	0
Unsecured senior debt securities	0	0
Junior subordinated deferrable interest debentures (related to trust preferred securities)	0	0
Notes payable	0	0
Derivatives	0	0
Contingent consideration	0	0
Fair Value \| NAV \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	0
Fair Value \| NAV \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| NAV \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| NAV \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	$ 0	$ 0