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Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Amortized cost |  |  |
Amortized cost | $ 8,237,004 | $ 8,852,825 |
Book Value |  |  |
Book Value - within 1 year | 602,350 |  |
Book Value - Within 1 to 5 years | 7,109,962 |  |
Book Value - After 5 to 10 years | 6,614 |  |
Book Value - After 10 years | 39,151 |  |
Book Value | 7,758,077 | 8,194,335 |
Allowance for credit losses |  |  |
Allowance for credit losses | 5,317 | 5,780 |
Net of Allowance |  |  |
Net of Allowance | 7,752,760 | 8,188,555 |
Gross unrecognized gains |  |  |
Gross Unrealized Gains | 2,388 | 3,578 |
Gross unrealized losses |  |  |
Gross Unrealized Losses | 72,484 | 32,748 |
Fair Value |  |  |
Fair Value - within 1 year | 597,850 |  |
Fair Value - After 1 to 5 years | 7,044,753 |  |
Fair Value - After 5 to 10 years | 6,612 |  |
Fair Value - After 10 years | 33,449 |  |
Fair value | $ 7,682,664 | $ 8,159,385 |
Weighted Average Yield |  |  |
Weighted Average Yield | 1.40% | 1.48% |
US Treasury Securities |  |  |
Amortized cost |  |  |
Amortized cost - Within 1 year | $ 599,910 | $ 597,768 |
Amortized cost - After 1 to 5 year | 7,572,435 | 7,971,072 |
Amortized cost - After 5 to 10 years |  | 211,061 |
Amortized cost | 8,172,345 | 8,779,901 |
Book Value |  |  |
Book Value - within 1 year | 599,910 | 597,768 |
Book Value - Within 1 to 5 years | 7,093,508 | 7,335,159 |
Book Value - After 5 to 10 years |  | 188,484 |
Book Value | 7,693,418 | 8,121,411 |
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 - After 5 to 10 years |  | 0 |
Allowance for credit losses | 0 | 0 |
Net of Allowance |  |  |
Net of Allowance - Within 1 Year | 599,910 | 597,768 |
Net of Allowance - After 1 to 5 Years | 7,093,508 | 7,335,159 |
Net of Allowance - After 5 to 10 Years |  | 188,484 |
Net of Allowance | 7,693,418 | 8,121,411 |
Gross unrecognized gains |  |  |
Gross unrealized gains - Within 1 year | 0 | 0 |
Gross unrealized gains - After 1 to 5 years | 0 | 637 |
Gross unrealized gains - After 5 to 10 years |  | 0 |
Gross Unrealized Gains | 0 | 637 |
Gross unrealized losses |  |  |
Gross unrealized losses - Within 1 year | 4,498 | 7,526 |
Gross unrealized losses - After 1 to 5 years | 65,096 | 21,996 |
Gross unrealized losses - After 5 to 10 years |  | 187 |
Gross Unrealized Losses | 69,594 | 29,709 |
Fair Value |  |  |
Fair Value - within 1 year | 595,412 | 590,242 |
Fair Value - After 1 to 5 years | 7,028,412 | 7,313,800 |
Fair Value - After 5 to 10 years |  | 188,297 |
Fair value | $ 7,623,824 | $ 8,092,339 |
Weighted Average Yield |  |  |
Weighted average yield - Within 1 Year | 2.76% | 2.58% |
Weighted average yield - After 1 to 5 years | 1.28% | 1.39% |
Weighted average yield - After 5 to 10 years |  | 1.50% |
Weighted Average Yield | 1.39% | 1.47% |
Obligations of Puerto Rico, States and political subdivisions |  |  |
Amortized cost |  |  |
Amortized cost - Within 1 year | $ 2,440 | $ 4,820 |
Amortized cost - After 1 to 5 year | 16,454 | 20,171 |
Amortized cost - After 5 to 10 years | 655 | 845 |
Amortized cost - After 10 years | 37,633 | 39,572 |
Amortized cost | 57,182 | 65,408 |
Book Value |  |  |
Book Value - within 1 year | 2,440 | 4,820 |
Book Value - Within 1 to 5 years | 16,454 | 20,171 |
Book Value - After 5 to 10 years | 655 | 845 |
Book Value - After 10 years | 37,633 | 39,572 |
Book Value | 57,182 | 65,408 |
Allowance for credit losses |  |  |
Allowance for credit losses - Within 1 Year | 5 | 9 |
Allowance for credit losses - After 1 to 5 years | 80 | 147 |
Allowance for credit losses - After 5 to 10 years | 22 | 28 |
Allowance for credit losses - After 10 years | 5,210 | 5,596 |
Allowance for credit losses | 5,317 | 5,780 | $ 6,911
Net of Allowance |  |  |
Net of Allowance - Within 1 Year | 2,435 | 4,811 |
Net of Allowance - After 1 to 5 Years | 16,374 | 20,024 |
Net of Allowance - After 5 to 10 Years | 633 | 817 |
Net of Allowance - After 10 Years | 32,423 | 33,976 |
Net of Allowance | 51,865 | 59,628 |
Gross unrecognized gains |  |  |
Gross unrealized gains - Within 1 year | 3 | 3 |
Gross unrealized gains - After 1 to 5 years | 47 | 96 |
Gross unrealized gains - After 5 to 10 years | 20 | 28 |
Gross unrealized gains - After 10 years | 2,318 | 2,814 |
Gross Unrealized Gains | 2,388 | 2,941 |
Gross unrealized losses |  |  |
Gross unrealized losses - Within 1 year | 0 | 0 |
Gross unrealized losses - After 1 to 5 years | 80 | 125 |
Gross unrealized losses - After 5 to 10 years | 0 | 0 |
Gross unrealized losses - After 10 years | 2,596 | 2,766 |
Gross Unrealized Losses | 2,676 | 2,891 |
Fair Value |  |  |
Fair Value - within 1 year | 2,438 | 4,814 |
Fair Value - After 1 to 5 years | 16,341 | 19,995 |
Fair Value - After 5 to 10 years | 653 | 845 |
Fair Value - After 10 years | 32,145 | 34,024 |
Fair value | $ 51,577 | $ 59,678 |
Weighted Average Yield |  |  |
Weighted average yield - Within 1 Year | 6.39% | 6.17% |
Weighted average yield - After 1 to 5 years | 3.69% | 3.80% |
Weighted average yield - After 5 to 10 years | 5.81% | 5.80% |
Weighted average yield - After 10 years | 1.42% | 1.41% |
Weighted Average Yield | 2.34% | 2.55% |
Collateralized Mortgage Obligations - Federal agencies |  |  |
Amortized cost |  |  |
Amortized cost - Within 1 year |  | $ 13 |
Amortized cost - After 10 years | $ 1,518 | 1,543 |
Amortized cost | 1,518 | 1,556 |
Book Value |  |  |
Book Value - within 1 year |  | 13 |
Book Value - After 10 years | 1,518 | 1,543 |
Book Value | 1,518 | 1,556 |
Allowance for credit losses |  |  |
Allowance for credit losses - Within 1 Year |  | 0 |
Allowance for credit losses - After 10 years | 0 | 0 |
Allowance for credit losses | 0 | 0 |
Net of Allowance |  |  |
Net of Allowance - Within 1 Year |  | 13 |
Net of Allowance - After 10 Years | 1,518 | 1,543 |
Net of Allowance | 1,518 | 1,556 |
Gross unrecognized gains |  |  |
Gross unrealized gains - Within 1 year |  | 0 |
Gross unrealized gains - After 10 years | 0 | 0 |
Gross Unrealized Gains | 0 | 0 |
Gross unrealized losses |  |  |
Gross unrealized losses - Within 1 year |  | 0 |
Gross unrealized losses - After 10 years | 214 | 148 |
Gross Unrealized Losses | 214 | 148 |
Fair Value |  |  |
Fair Value - within 1 year |  | 13 |
Fair Value - After 10 years | 1,304 | 1,395 |
Fair value | $ 1,304 | $ 1,408 |
Weighted Average Yield |  |  |
Weighted average yield - Within 1 Year |  | 6.44% |
Weighted average yield - After 10 years | 2.87% | 2.87% |
Weighted Average Yield | 2.87% | 2.90% |
Securities in wholly owned statutory business trusts |  |  |
Amortized cost |  |  |
Amortized cost - After 5 to 10 years | $ 5,959 |  |
Amortized cost - After 10 years | 0 | $ 5,960 |
Amortized cost | 5,959 | 5,960 |
Book Value |  |  |
Book Value - After 5 to 10 years | 5,959 |  |
Book Value - After 10 years | 0 | 5,960 |
Book Value | 5,959 | 5,960 |
Allowance for credit losses |  |  |
Allowance for credit losses - After 5 to 10 years | 0 |  |
Allowance for credit losses - After 10 years | 0 | 0 |
Allowance for credit losses | 0 | 0 |
Net of Allowance |  |  |
Net of Allowance - After 5 to 10 Years | 5,959 |  |
Net of Allowance - After 10 Years |  | 5,960 |
Net of Allowance | 5,959 | 5,960 |
Gross unrecognized gains |  |  |
Gross unrealized gains - After 5 to 10 years | 0 |  |
Gross unrealized gains - After 10 years |  | 0 |
Gross Unrealized Gains | 0 | 0 |
Gross unrealized losses |  |  |
Gross unrealized losses - After 5 to 10 years | 0 |  |
Gross unrealized losses - After 10 years |  | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value |  |  |
Fair Value - After 5 to 10 years | 5,959 |  |
Fair Value - After 10 years |  | 5,960 |
Fair value | $ 5,959 | $ 5,960 |
Weighted Average Yield |  |  |
Weighted average yield - After 5 to 10 years | 633.00% |  |
Weighted average yield - After 10 years |  | 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 after 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 (4) -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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