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Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Amortized cost |  |  |  |  |  |
Amortized cost | $ 1,953,710 |  | $ 79,461 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses | 7,210 |  | 8,096 |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance | 1,946,500 |  | 71,365 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross Unrealized Gains | 5,136 |  | 12,003 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross Unrealized Losses | 54,078 |  | 0 |  |  |
Fair Value |  |  |  |  |  |
Fair value | $ 1,897,558 |  | $ 83,368 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted Average Yield | 2.80% |  | 3.06% |  |  |
US Treasury Securities |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - Within 1 year | $ 348,053 |  |  |  |  |
Amortized cost - After 1 to 5 years | 1,533,494 |  |  |  |  |
Amortized cost | 1,881,547 |  |  |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses - Within 1 Year | 0 |  |  |  |  |
Allowance for credit losses - After 1 to 5 years | 0 |  |  |  |  |
Allowance for credit losses | 0 |  |  |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance - Within 1 Year | 348,053 |  |  |  |  |
Net of Allowance - After 1 to 5 Years | 1,533,494 |  |  |  |  |
Net of Allowance | 1,881,547 |  |  |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - Within 1 year | 0 |  |  |  |  |
Gross unrealized gains - After 1 to 5 years | 0 |  |  |  |  |
Gross Unrealized Gains | 0 |  |  |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross unrealized losses - Within 1 year | 3,262 |  |  |  |  |
Gross unrealized losses - After 1 to 5 years | 48,605 |  |  |  |  |
Gross Unrealized Losses | 51,867 |  |  |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year | 344,791 |  |  |  |  |
Fair Value - After 1 to 5 years | 1,484,889 |  |  |  |  |
Fair value | $ 1,829,680 |  |  |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - Within 1 Year | 3.00% |  |  |  |  |
Weighted average yield - After 1 to 5 years | 2.75% |  |  |  |  |
Weighted Average Yield | 2.80% |  |  |  |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - Within 1 year | $ 4,530 |  | $ 4,240 |  |  |
Amortized cost - After 1 to 5 years | 19,105 |  | 14,395 |  |  |
Amortized cost - After 5 to 10 years | 1,025 |  | 11,280 |  |  |
Amortized cost - After 10 years | 41,519 |  | 43,561 |  |  |
Amortized cost | 66,179 |  | 73,476 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses - Within 1 Year | 11 |  | 7 |  |  |
Allowance for credit losses - After 1 to 5 years | 215 |  | 148 |  |  |
Allowance for credit losses - After 5 to 10 years | 33 |  | 122 |  |  |
Allowance for credit losses - After 10 years | 6,951 |  | 7,819 |  |  |
Allowance for credit losses | 7,210 | $ 7,495 | 8,096 | $ 9,222 | $ 10,214 | $ 10,261
Net of Allowance |  |  |  |  |  |
Net of Allowance - Within 1 Year | 4,519 |  | 4,233 |  |  |
Net of Allowance - After 1 to 5 Years | 18,890 |  | 14,247 |  |  |
Net of Allowance - After 5 to 10 Years | 992 |  | 11,158 |  |  |
Net of Allowance - After 10 Years | 34,568 |  | 35,742 |  |  |
Net of Allowance | 58,969 |  | 65,380 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - Within 1 year | 7 |  | 4 |  |  |
Gross unrealized gains - After 1 to 5 years | 149 |  | 149 |  |  |
Gross unrealized gains - After 5 to 10 years | 33 |  | 104 |  |  |
Gross unrealized gains - After 10 years | 4,947 |  | 11,746 |  |  |
Gross Unrealized Gains | 5,136 |  | 12,003 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross unrealized losses - Within 1 year | 0 |  | 0 |  |  |
Gross unrealized losses - After 1 to 5 years | 81 |  | 0 |  |  |
Gross unrealized losses - After 5 to 10 years | 0 |  | 0 |  |  |
Gross unrealized losses - After 10 years | 2,130 |  | 0 |  |  |
Gross Unrealized Losses | 2,211 |  | 0 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year | 4,526 |  | 4,237 |  |  |
Fair Value - After 1 to 5 years | 18,958 |  | 14,396 |  |  |
Fair Value - After 5 to 10 years | 1,025 |  | 11,262 |  |  |
Fair Value - After 10 years | 37,385 |  | 47,488 |  |  |
Fair value | $ 61,894 |  | $ 77,383 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - Within 1 Year | 6.10% |  | 6.07% |  |  |
Weighted average yield - After 1 to 5 years | 4.24% |  | 6.23% |  |  |
Weighted average yield - After 5 to 10 years | 5.80% |  | 2.18% |  |  |
Weighted average yield - After 10 years | 1.41% |  | 1.50% |  |  |
Weighted Average Yield | 2.62% |  | 2.79% |  |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - After 1 to 5 years | $ 24 |  | $ 25 |  |  |
Amortized cost | 24 |  | 25 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses - After 1 to 5 years | 0 |  | 0 |  |  |
Allowance for credit losses | 0 |  | 0 |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance - After 1 to 5 Years | 24 |  | 25 |  |  |
Net of Allowance | 24 |  | 25 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - After 1 to 5 years | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross unrealized losses - After 1 to 5 years | 0 |  | 0 |  |  |
Gross Unrealized Losses | 0 |  | 0 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - After 1 to 5 years | 24 |  | 25 |  |  |
Fair value | $ 24 |  | $ 25 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - After 1 to 5 years | 6.44% |  | 6.44% |  |  |
Weighted Average Yield | 6.44% |  | 6.44% |  |  |
Securities in wholly owned statutory business trusts |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - After 10 years | $ 5,960 |  | $ 5,960 |  |  |
Amortized cost | 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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