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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, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Amortized cost |  |  |  |  |  |
Amortized cost | $ 9,004,729 |  | $ 9,356,739 |  |  |
Book Value |  |  |  |  |  |
Book Value | 8,302,082 |  | 8,525,366 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses | 6,057 |  | 6,911 |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance | 8,296,025 |  | 8,518,455 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross Unrealized Gains | 2,370 |  | 4,918 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross Unrealized Losses | 233,328 |  | 83,177 |  |  |
Fair Value |  |  |  |  |  |
Fair value | $ 8,065,067 |  | $ 8,440,196 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted Average Yield | 1.50% |  | 1.55% |  |  |
US Treasury Securities |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - Within 1 year | $ 597,876 |  | $ 499,034 |  |  |
Amortized cost - After 1 to 5 year | 7,516,523 |  | 6,147,568 |  |  |
Amortized cost - After 5 to 10 years | 817,006 |  | 2,638,238 |  |  |
Amortized cost | 8,931,405 |  | 9,284,840 |  |  |
Book Value |  |  |  |  |  |
Book Value - within 1 year | 597,876 |  | 499,034 |  |  |
Book Value - Within 1 to 5 years | 6,900,125 |  | 5,640,767 |  |  |
Book Balue - After 5 to 10 years | 730,757 |  | 2,313,666 |  |  |
Book Value | 8,228,758 |  | 8,453,467 |  |  |
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 |  | 0 |  |  |
Allowance for credit losses | 0 |  | 0 |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance - Within 1 Year | 597,876 |  | 499,034 |  |  |
Net of Allowance - After 1 to 5 Years | 6,900,125 |  | 5,640,767 |  |  |
Net of Allowance - After 5 to 10 Years | 730,757 |  | 2,313,666 |  |  |
Net of Allowance | 8,228,758 |  | 8,453,467 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - Within 1 year | 0 |  | 0 |  |  |
Gross unrealized gains - After 1 to 5 years | 0 |  | 0 |  |  |
Gross unrealized gains - After 5 to 10 years | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross unrealized losses - Within 1 year | 9,036 |  | 6,203 |  |  |
Gross unrealized losses - After 1 to 5 years | 193,838 |  | 59,806 |  |  |
Gross unrealized losses - After 5 to 10 years | 26,819 |  | 14,857 |  |  |
Gross Unrealized Losses | 229,693 |  | 80,866 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year | 588,840 |  | 492,831 |  |  |
Fair Value - After 1 to 5 years | 6,706,287 |  | 5,580,961 |  |  |
Fair Value - After 5 to 10 years | 703,938 |  | 2,298,809 |  |  |
Fair value | $ 7,999,065 |  | $ 8,372,601 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - Within 1 Year | 2.55% |  | 2.83% |  |  |
Weighted average yield - After 1 to 5 years | 1.39% |  | 1.49% |  |  |
Weighted average yield - After 5 to 10 years | 1.60% |  | 1.41% |  |  |
Weighted Average Yield | 1.49% |  | 1.54% |  |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - Within 1 year | $ 4,820 |  | $ 4,530 |  |  |
Amortized cost - After 1 to 5 year | 20,191 |  | 19,105 |  |  |
Amortized cost - After 5 to 10 years | 845 |  | 1,025 |  |  |
Amortized cost - After 10 years | 39,946 |  | 41,261 |  |  |
Amortized cost | 65,802 |  | 65,921 |  |  |
Book Value |  |  |  |  |  |
Book Value - within 1 year | 4,820 |  | 4,530 |  |  |
Book Value - Within 1 to 5 years | 20,191 |  | 19,105 |  |  |
Book Balue - After 5 to 10 years | 845 |  | 1,025 |  |  |
Book Value - After 10 years | 39,946 |  | 41,261 |  |  |
Book Value | 65,802 |  | 65,921 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses - Within 1 Year | 13 |  | 8 |  |  |
Allowance for credit losses - After 1 to 5 years | 154 |  | 234 |  |  |
Allowance for credit losses - After 5 to 10 years | 28 |  | 34 |  |  |
Allowance for credit losses - After 10 years | 5,862 |  | 6,635 |  |  |
Allowance for credit losses | 6,057 | $ 6,145 | 6,911 | $ 7,210 | $ 7,495 | $ 8,096
Net of Allowance |  |  |  |  |  |
Net of Allowance - Within 1 Year | 4,807 |  | 4,522 |  |  |
Net of Allowance - After 1 to 5 Years | 20,037 |  | 18,871 |  |  |
Net of Allowance - After 5 to 10 Years | 817 |  | 991 |  |  |
Net of Allowance - After 10 Years | 34,084 |  | 34,626 |  |  |
Net of Allowance | 59,745 |  | 59,010 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - Within 1 year | 2 |  | 5 |  |  |
Gross unrealized gains - After 1 to 5 years | 67 |  | 150 |  |  |
Gross unrealized gains - After 5 to 10 years | 0 |  | 34 |  |  |
Gross unrealized gains - After 10 years | 2,301 |  | 4,729 |  |  |
Gross Unrealized Gains | 2,370 |  | 4,918 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross unrealized losses - Within 1 year | 17 |  | 0 |  |  |
Gross unrealized losses - After 1 to 5 years | 266 |  | 82 |  |  |
Gross unrealized losses - After 5 to 10 years | 9 |  | 0 |  |  |
Gross unrealized losses - After 10 years | 3,092 |  | 2,229 |  |  |
Gross Unrealized Losses | 3,384 |  | 2,311 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year | 4,792 |  | 4,527 |  |  |
Fair Value - After 1 to 5 years | 19,838 |  | 18,939 |  |  |
Fair Value - After 5 to 10 years | 808 |  | 1,025 |  |  |
Fair Value - After 10 years | 33,293 |  | 37,126 |  |  |
Fair value | $ 58,731 |  | $ 61,617 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - Within 1 Year | 6.17% |  | 6.08% |  |  |
Weighted average yield - After 1 to 5 years | 3.80% |  | 4.24% |  |  |
Weighted average yield - After 5 to 10 years | 5.80% |  | 5.80% |  |  |
Weighted average yield - After 10 years | 1.41% |  | 1.40% |  |  |
Weighted Average Yield | 2.55% |  | 2.61% |  |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - Within 1 year | $ 15 |  |  |  |  |
Amortized cost - After 1 to 5 year |  |  | $ 19 |  |  |
Amortized cost - After 10 years | 1,547 |  |  |  |  |
Amortized cost | 1,562 |  | 19 |  |  |
Book Value |  |  |  |  |  |
Book Value - within 1 year | 15 |  |  |  |  |
Book Value - Within 1 to 5 years |  |  | 19 |  |  |
Book Value - After 10 years | 1,547 |  |  |  |  |
Book Value | 1,562 |  | 19 |  |  |
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 - After 10 years | 0 |  |  |  |  |
Allowance for credit losses | 0 |  | 0 |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance - Within 1 Year | 15 |  |  |  |  |
Net of Allowance - After 1 to 5 Years |  |  | 19 |  |  |
Net of Allowance - After 10 Years | 1,547 |  |  |  |  |
Net of Allowance | 1,562 |  | 19 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - Within 1 year | 0 |  |  |  |  |
Gross unrealized gains - After 1 to 5 years |  |  | 0 |  |  |
Gross unrealized gains - After 10 years | 0 |  |  |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross unrealized losses - Within 1 year | 0 |  |  |  |  |
Gross unrealized losses - After 1 to 5 years |  |  | 0 |  |  |
Gross unrealized losses - After 10 years | 251 |  |  |  |  |
Gross Unrealized Losses | 251 |  | 0 |  |  |
Fair Value |  |  |  |  |  |
Fair Value - within 1 year | 15 |  |  |  |  |
Fair Value - After 1 to 5 years |  |  | 19 |  |  |
Fair Value - After 10 years | 1,296 |  |  |  |  |
Fair value | $ 1,311 |  | $ 19 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - Within 1 Year | 6.44% |  |  |  |  |
Weighted average yield - After 1 to 5 years |  |  | 6.44% |  |  |
Weighted average yield - After 10 years | 2.87% |  |  |  |  |
Weighted Average Yield | 2.90% |  | 6.44% |  |  |
Securities in wholly owned statutory business trusts |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - After 10 years | $ 5,960 |  | $ 5,959 |  |  |
Amortized cost | 5,960 |  | 5,959 |  |  |
Book Value |  |  |  |  |  |
Book Value - After 10 years | 5,960 |  | 5,959 |  |  |
Book Value | 5,960 |  | 5,959 |  |  |
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 |  | 5,959 |  |  |
Net of Allowance | 5,960 |  | 5,959 |  |  |
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 |  | 5,959 |  |  |
Fair value | $ 5,960 |  | $ 5,959 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - After 10 years | 6.33% |  | 6.33% |  |  |
Weighted Average Yield | 6.33% |  | 6.33% |  |  |

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