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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, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Amortized cost |  |  |  |
Amortized cost | $ 8,697,641 | $ 8,852,825 |  |
Book Value |  |  |  |
Book Value | 8,083,160 | 8,194,335 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses | 5,731 | 5,780 |  |
Net of Allowance |  |  |  |
Net of Allowance | 8,077,429 | 8,188,555 |  |
Gross unrecognized gains |  |  |  |
Gross Unrealized Gains | 2,993 | 3,578 |  |
Gross unrealized losses |  |  |  |
Gross Unrealized Losses | 122,096 | 32,748 |  |
Fair Value |  |  |  |
Fair value | $ 7,958,326 | $ 8,159,385 |  |
Weighted Average Yield |  |  |  |
Weighted Average Yield | 1.47% | 1.48% |  |
US Treasury Securities |  |  |  |
Amortized cost |  |  |  |
Amortized cost - Within 1 year | $ 597,620 | $ 597,768 |  |
Amortized cost - After 1 to 5 year | 8,030,813 | 7,971,072 |  |
Amortized cost - After 5 to 10 years |  | 211,061 |  |
Amortized cost | 8,628,433 | 8,779,901 |  |
Book Value |  |  |  |
Book Value - within 1 year | 597,620 | 597,768 |  |
Book Value - Within 1 to 5 years | 7,416,332 | 7,335,159 |  |
Book Value - After 5 to 10 years |  | 188,484 |  |
Book Value | 8,013,952 | 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 | 597,620 | 597,768 |  |
Net of Allowance - After 1 to 5 Years | 7,416,332 | 7,335,159 |  |
Net of Allowance - After 5 to 10 Years |  | 188,484 |  |
Net of Allowance | 8,013,952 | 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 | 7,857 | 7,526 |  |
Gross unrealized losses - After 1 to 5 years | 111,295 | 21,996 |  |
Gross unrealized losses - After 5 to 10 years |  | 187 |  |
Gross Unrealized Losses | 119,152 | 29,709 |  |
Fair Value |  |  |  |
Fair Value - within 1 year | 589,763 | 590,242 |  |
Fair Value - After 1 to 5 years | 7,305,037 | 7,313,800 |  |
Fair Value - After 5 to 10 years |  | 188,297 |  |
Fair value | $ 7,894,800 | $ 8,092,339 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - Within 1 Year | 2.61% | 2.58% |  |
Weighted average yield - After 1 to 5 years | 1.37% | 1.39% |  |
Weighted average yield - After 5 to 10 years |  | 1.50% |  |
Weighted Average Yield | 1.46% | 1.47% |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Amortized cost |  |  |  |
Amortized cost - Within 1 year | $ 3,055 | $ 4,820 |  |
Amortized cost - After 1 to 5 year | 18,615 | 20,171 |  |
Amortized cost - After 5 to 10 years | 845 | 845 |  |
Amortized cost - After 10 years | 39,197 | 39,572 |  |
Amortized cost | 61,712 | 65,408 |  |
Book Value |  |  |  |
Book Value - within 1 year | 3,055 | 4,820 |  |
Book Value - Within 1 to 5 years | 18,615 | 20,171 |  |
Book Value - After 5 to 10 years | 845 | 845 |  |
Book Value - After 10 years | 39,197 | 39,572 |  |
Book Value | 61,712 | 65,408 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - Within 1 Year | 11 | 9 |  |
Allowance for credit losses - After 1 to 5 years | 135 | 147 |  |
Allowance for credit losses - After 5 to 10 years | 28 | 28 |  |
Allowance for credit losses - After 10 years | 5,557 | 5,596 |  |
Allowance for credit losses | 5,731 | 5,780 | $ 6,792 | $ 6,911
Net of Allowance |  |  |  |
Net of Allowance - Within 1 Year | 3,044 | 4,811 |  |
Net of Allowance - After 1 to 5 Years | 18,480 | 20,024 |  |
Net of Allowance - After 5 to 10 Years | 817 | 817 |  |
Net of Allowance - After 10 Years | 33,640 | 33,976 |  |
Net of Allowance | 55,981 | 59,628 |  |
Gross unrecognized gains |  |  |  |
Gross unrealized gains - Within 1 year | 7 | 3 |  |
Gross unrealized gains - After 1 to 5 years | 68 | 96 |  |
Gross unrealized gains - After 5 to 10 years | 28 | 28 |  |
Gross unrealized gains - After 10 years | 2,890 | 2,814 |  |
Gross Unrealized Gains | 2,993 | 2,941 |  |
Gross unrealized losses |  |  |  |
Gross unrealized losses - Within 1 year | 6 | 0 |  |
Gross unrealized losses - After 1 to 5 years | 130 | 125 |  |
Gross unrealized losses - After 5 to 10 years | 0 | 0 |  |
Gross unrealized losses - After 10 years | 2,636 | 2,766 |  |
Gross Unrealized Losses | 2,772 | 2,891 |  |
Fair Value |  |  |  |
Fair Value - within 1 year | 3,045 | 4,814 |  |
Fair Value - After 1 to 5 years | 18,418 | 19,995 |  |
Fair Value - After 5 to 10 years | 845 | 845 |  |
Fair Value - After 10 years | 33,894 | 34,024 |  |
Fair value | $ 56,202 | $ 59,678 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - Within 1 Year | 6.23% | 6.17% |  |
Weighted average yield - After 1 to 5 years | 3.60% | 3.80% |  |
Weighted average yield - After 5 to 10 years | 5.80% | 5.80% |  |
Weighted average yield - After 10 years | 1.42% | 1.41% |  |
Weighted Average Yield | 2.38% | 2.55% |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Amortized cost |  |  |  |
Amortized cost - Within 1 year |  | $ 13 |  |
Amortized cost - After 10 years | $ 1,536 | 1,543 |  |
Amortized cost | 1,536 | 1,556 |  |
Book Value |  |  |  |
Book Value - within 1 year |  | 13 |  |
Book Value - After 10 years | 1,536 | 1,543 |  |
Book Value | 1,536 | 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 | 1,536 | 1,543 |  |
Net of Allowance | 1,536 | 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 | 172 | 148 |  |
Gross Unrealized Losses | 172 | 148 |  |
Fair Value |  |  |  |
Fair Value - within 1 year |  | 13 |  |
Fair Value - After 10 years | 1,364 | 1,395 |  |
Fair value | $ 1,364 | $ 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 10 years | $ 5,960 | $ 5,960 |  |
Amortized cost | 5,960 | 5,960 |  |
Book Value |  |  |  |
Book Value - After 10 years | 5,960 | 5,960 |  |
Book Value | 5,960 | 5,960 |  |
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 | 5,960 | 5,960 |  |
Net of Allowance | 5,960 | 5,960 |  |
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 | 0 | 0 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value |  |  |  |
Fair Value - After 10 years | 5,960 | 5,960 |  |
Fair value | $ 5,960 | $ 5,960 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - After 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 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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Industry Guide -Number 3 -Section II -Paragraph B -Publisher SEC + Details
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