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Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Amortized cost |  |  |  |
Amortized cost | $ 8,082,335 | $ 8,237,004 |  |
Book Value |  |  |  |
Book Value | 7,648,718 | 7,758,077 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses | 5,481 | 5,317 |  |
Net of Allowance |  |  |  |
Net of Allowance | 7,643,237 | 7,752,760 |  |
Gross unrecognized gains |  |  |  |
Gross Unrealized Gains | 5,205 | 2,388 |  |
Gross unrealized losses |  |  |  |
Gross Unrealized Losses | 7,756 | 72,484 |  |
Fair Value |  |  |  |
Fair value | $ 7,640,686 | $ 7,682,664 |  |
Weighted Average Yield |  |  |  |
Weighted Average Yield | 1.38% | 1.40% |  |
US Treasury Securities |  |  |  |
Amortized cost |  |  |  |
Amortized cost - Within 1 year | $ 850,742 | $ 599,910 |  |
Amortized cost - After 1 to 5 year | 7,169,044 | 7,572,435 |  |
Amortized cost | 8,019,786 | 8,172,345 |  |
Book Value |  |  |  |
Book Value - within 1 year | 844,252 | 599,910 |  |
Book Value - Within 1 to 5 years | 6,741,917 | 7,093,508 |  |
Book Value | 7,586,169 | 7,693,418 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - Within 1 Year | 0 | 0 |  |
Allowance for credit losses - After 1 to 5 years | 0 | 0 |  |
Allowance for credit losses | 0 | 0 |  |
Net of Allowance |  |  |  |
Net of Allowance - Within 1 Year | 844,252 | 599,910 |  |
Net of Allowance - After 1 to 5 Years | 6,741,917 | 7,093,508 |  |
Net of Allowance | 7,586,169 | 7,693,418 |  |
Gross unrecognized gains |  |  |  |
Gross unrealized gains - Within 1 year | 0 | 0 |  |
Gross unrealized gains - After 1 to 5 years | 2,506 | 0 |  |
Gross Unrealized Gains | 2,506 | 0 |  |
Gross unrealized losses |  |  |  |
Gross unrealized losses - Within 1 year | 3,680 | 4,498 |  |
Gross unrealized losses - After 1 to 5 years | 1,481 | 65,096 |  |
Gross Unrealized Losses | 5,161 | 69,594 |  |
Fair Value |  |  |  |
Fair Value - within 1 year | 840,572 | 595,412 |  |
Fair Value - After 1 to 5 years | 6,742,942 | 7,028,412 |  |
Fair value | $ 7,583,514 | $ 7,623,824 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - Within 1 Year | 2.45% | 2.76% |  |
Weighted average yield - After 1 to 5 years | 1.24% | 1.28% |  |
Weighted Average Yield | 1.37% | 1.39% |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Amortized cost |  |  |  |
Amortized cost - Within 1 year | $ 2,540 | $ 2,440 |  |
Amortized cost - After 1 to 5 year | 14,798 | 16,454 |  |
Amortized cost - After 5 to 10 years | 655 | 655 |  |
Amortized cost - After 10 years | 37,082 | 37,633 |  |
Amortized cost | 55,075 | 57,182 |  |
Book Value |  |  |  |
Book Value - within 1 year | 2,540 | 2,440 |  |
Book Value - Within 1 to 5 years | 14,798 | 16,454 |  |
Book Value - After 5 to 10 years | 655 | 655 |  |
Book Value - After 10 years | 37,082 | 37,633 |  |
Book Value | 55,075 | 57,182 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - Within 1 Year | 11 | 5 |  |
Allowance for credit losses - After 1 to 5 years | 69 | 80 |  |
Allowance for credit losses - After 5 to 10 years | 22 | 22 |  |
Allowance for credit losses - After 10 years | 5,379 | 5,210 |  |
Allowance for credit losses | 5,481 | 5,317 | $ 5,731 | $ 5,780
Net of Allowance |  |  |  |
Net of Allowance - Within 1 Year | 2,529 | 2,435 |  |
Net of Allowance - After 1 to 5 Years | 14,729 | 16,374 |  |
Net of Allowance - After 5 to 10 Years | 633 | 633 |  |
Net of Allowance - After 10 Years | 31,703 | 32,423 |  |
Net of Allowance | 49,594 | 51,865 |  |
Gross unrecognized gains |  |  |  |
Gross unrealized gains - Within 1 year | 10 | 3 |  |
Gross unrealized gains - After 1 to 5 years | 36 | 47 |  |
Gross unrealized gains - After 5 to 10 years | 21 | 20 |  |
Gross unrealized gains - After 10 years | 2,632 | 2,318 |  |
Gross Unrealized Gains | 2,699 | 2,388 |  |
Gross unrealized losses |  |  |  |
Gross unrealized losses - Within 1 year | 1 | 0 |  |
Gross unrealized losses - After 1 to 5 years | 84 | 80 |  |
Gross unrealized losses - After 5 to 10 years | 0 | 0 |  |
Gross unrealized losses - After 10 years | 2,325 | 2,596 |  |
Gross Unrealized Losses | 2,410 | 2,676 |  |
Fair Value |  |  |  |
Fair Value - within 1 year | 2,538 | 2,438 |  |
Fair Value - After 1 to 5 years | 14,681 | 16,341 |  |
Fair Value - After 5 to 10 years | 654 | 653 |  |
Fair Value - After 10 years | 32,010 | 32,145 |  |
Fair value | $ 49,883 | $ 51,577 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - Within 1 Year | 6.41% | 6.39% |  |
Weighted average yield - After 1 to 5 years | 3.39% | 3.69% |  |
Weighted average yield - After 5 to 10 years | 5.81% | 5.81% |  |
Weighted average yield - After 10 years | 1.42% | 1.42% |  |
Weighted Average Yield | 2.23% | 2.34% |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Amortized cost |  |  |  |
Amortized cost - After 10 years | $ 1,514 | $ 1,518 |  |
Amortized cost | 1,514 | 1,518 |  |
Book Value |  |  |  |
Book Value - After 10 years | 1,514 | 1,518 |  |
Book Value | 1,514 | 1,518 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - After 10 years | 0 | 0 |  |
Allowance for credit losses | 0 | 0 |  |
Net of Allowance |  |  |  |
Net of Allowance - After 10 Years | 1,514 | 1,518 |  |
Net of Allowance | 1,514 | 1,518 |  |
Gross unrecognized gains |  |  |  |
Gross unrealized gains - After 10 years | 0 | 0 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross unrealized losses |  |  |  |
Gross unrealized losses - After 10 years | 185 | 214 |  |
Gross Unrealized Losses | 185 | 214 |  |
Fair Value |  |  |  |
Fair Value - After 10 years | 1,329 | 1,304 |  |
Fair value | $ 1,329 | $ 1,304 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - After 10 years | 2.87% | 2.87% |  |
Weighted Average Yield | 2.87% | 2.87% |  |
Securities in wholly owned statutory business trusts |  |  |  |
Amortized cost |  |  |  |
Amortized cost - After 5 to 10 years | $ 5,960 | $ 5,959 |  |
Amortized cost | 5,960 | 5,959 |  |
Book Value |  |  |  |
Book Value - After 5 to 10 years | 5,960 | 5,959 |  |
Book Value | 5,960 | 5,959 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - After 5 to 10 years | 0 | 0 |  |
Allowance for credit losses | 0 | 0 |  |
Net of Allowance |  |  |  |
Net of Allowance - After 5 to 10 Years | 5,960 | 5,959 |  |
Net of Allowance | 5,960 | 5,959 |  |
Gross unrecognized gains |  |  |  |
Gross unrealized gains - After 5 to 10 years | 0 | 0 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross unrealized losses |  |  |  |
Gross unrealized losses - After 5 to 10 years | 0 | 0 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value |  |  |  |
Fair Value - After 5 to 10 years | 5,960 | 5,959 |  |
Fair value | $ 5,960 | $ 5,959 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - After 5 to 10 years | 6.33% | 6.33% |  |
Weighted Average Yield | 6.33% | 6.33% |  |

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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph a -Subparagraph (3) -Publisher SEC + Details
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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph a -Subparagraph (2) -Publisher SEC + Details
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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph a -Subparagraph (1) -Publisher SEC + Details
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