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Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Amortized cost |  |  |  |  |  |
Amortized cost | $ 8,545,585 |  | $ 8,852,825 |  |  |
Book Value |  |  |  |  |  |
Book Value | 7,975,524 |  | 8,194,335 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses | 6,251 |  | 5,780 |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance | 7,969,273 |  | 8,188,555 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross Unrealized Gains | 2,855 |  | 3,578 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross Unrealized Losses | 138,912 |  | 32,748 |  |  |
Fair Value |  |  |  |  |  |
Fair value | $ 7,833,216 |  | $ 8,159,385 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted Average Yield | 1.44% |  | 1.48% |  |  |
US Treasury Securities |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - Within 1 year | $ 598,695 |  | $ 597,768 |  |  |
Amortized cost - After 1 to 5 year | 7,878,042 |  | 7,971,072 |  |  |
Amortized cost - After 5 to 10 years |  |  | 211,061 |  |  |
Amortized cost | 8,476,737 |  | 8,779,901 |  |  |
Book Value |  |  |  |  |  |
Book Value - within 1 year | 598,695 |  | 597,768 |  |  |
Book Value - Within 1 to 5 years | 7,307,981 |  | 7,335,159 |  |  |
Book Value - After 5 to 10 years |  |  | 188,484 |  |  |
Book Value | 7,906,676 |  | 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 | 598,695 |  | 597,768 |  |  |
Net of Allowance - After 1 to 5 Years | 7,307,981 |  | 7,335,159 |  |  |
Net of Allowance - After 5 to 10 Years |  |  | 188,484 |  |  |
Net of Allowance | 7,906,676 |  | 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 | 7,917 |  | 7,526 |  |  |
Gross unrealized losses - After 1 to 5 years | 128,694 |  | 21,996 |  |  |
Gross unrealized losses - After 5 to 10 years |  |  | 187 |  |  |
Gross Unrealized Losses | 136,611 |  | 29,709 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year | 590,778 |  | 590,242 |  |  |
Fair Value - After 1 to 5 years | 7,179,287 |  | 7,313,800 |  |  |
Fair Value - After 5 to 10 years |  |  | 188,297 |  |  |
Fair value | $ 7,770,065 |  | $ 8,092,339 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - Within 1 Year | 2.66% |  | 2.58% |  |  |
Weighted average yield - After 1 to 5 years | 1.34% |  | 1.39% |  |  |
Weighted average yield - After 5 to 10 years |  |  | 1.50% |  |  |
Weighted Average Yield | 1.43% |  | 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 | 18,595 |  | 20,171 |  |  |
Amortized cost - After 5 to 10 years | 845 |  | 845 |  |  |
Amortized cost - After 10 years | 38,866 |  | 39,572 |  |  |
Amortized cost | 61,361 |  | 65,408 |  |  |
Book Value |  |  |  |  |  |
Book Value - within 1 year | 3,055 |  | 4,820 |  |  |
Book Value - Within 1 to 5 years | 18,595 |  | 20,171 |  |  |
Book Value - After 5 to 10 years | 845 |  | 845 |  |  |
Book Value - After 10 years | 38,866 |  | 39,572 |  |  |
Book Value | 61,361 |  | 65,408 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses - Within 1 Year | 6 |  | 9 |  |  |
Allowance for credit losses - After 1 to 5 years | 112 |  | 147 |  |  |
Allowance for credit losses - After 5 to 10 years | 28 |  | 28 |  |  |
Allowance for credit losses - After 10 years | 6,105 |  | 5,596 |  |  |
Allowance for credit losses | 6,251 | $ 5,731 | 5,780 | $ 6,145 | $ 6,792 | $ 6,911
Net of Allowance |  |  |  |  |  |
Net of Allowance - Within 1 Year | 3,049 |  | 4,811 |  |  |
Net of Allowance - After 1 to 5 Years | 18,483 |  | 20,024 |  |  |
Net of Allowance - After 5 to 10 Years | 817 |  | 817 |  |  |
Net of Allowance - After 10 Years | 32,761 |  | 33,976 |  |  |
Net of Allowance | 55,110 |  | 59,628 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - Within 1 year | 2 |  | 3 |  |  |
Gross unrealized gains - After 1 to 5 years | 52 |  | 96 |  |  |
Gross unrealized gains - After 5 to 10 years | 20 |  | 28 |  |  |
Gross unrealized gains - After 10 years | 2,781 |  | 2,814 |  |  |
Gross Unrealized Gains | 2,855 |  | 2,941 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross unrealized losses - Within 1 year | 0 |  | 0 |  |  |
Gross unrealized losses - After 1 to 5 years | 148 |  | 125 |  |  |
Gross unrealized losses - After 5 to 10 years | 0 |  | 0 |  |  |
Gross unrealized losses - After 10 years | 1,967 |  | 2,766 |  |  |
Gross Unrealized Losses | 2,115 |  | 2,891 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year | 3,051 |  | 4,814 |  |  |
Fair Value - After 1 to 5 years | 18,387 |  | 19,995 |  |  |
Fair Value - After 5 to 10 years | 837 |  | 845 |  |  |
Fair Value - After 10 years | 33,575 |  | 34,024 |  |  |
Fair value | $ 55,850 |  | $ 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 | $ 1,527 |  | 1,543 |  |  |
Amortized cost | 1,527 |  | 1,556 |  |  |
Book Value |  |  |  |  |  |
Book Value - within 1 year |  |  | 13 |  |  |
Book Value - After 10 years | 1,527 |  | 1,543 |  |  |
Book Value | 1,527 |  | 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 | 1,527 |  | 1,543 |  |  |
Net of Allowance | 1,527 |  | 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 | 186 |  | 148 |  |  |
Gross Unrealized Losses | 186 |  | 148 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year |  |  | 13 |  |  |
Fair Value - After 10 years | 1,341 |  | 1,395 |  |  |
Fair value | $ 1,341 |  | $ 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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