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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, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized cost |  |
Amortized cost | $ 7,773,319 | $ 8,237,004
Book Value |  |
Book Value | 7,433,135 | 7,758,077
Allowance for credit losses |  |
Allowance for credit losses | 5,837 | 5,317
Net of Allowance |  |
Net of Allowance | 7,427,298 | 7,752,760
Gross unrecognized gains |  |
Gross Unrealized Gains | 35,025 | 2,388
Gross unrealized losses |  |
Gross Unrealized Losses | 2,835 | 72,484
Fair Value |  |
Fair value | $ 7,459,488 | $ 7,682,664
Weighted Average Yield |  |
Weighted Average Yield | 1.32% | 1.40%
US Treasury Securities |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 2,107,187 | $ 599,910
Amortized cost - After 1 to 5 year | 5,607,069 | 7,572,435
Amortized cost | 7,714,256 | 8,172,345
Book Value |  |
Book Value - within 1 year | 2,071,286 | 599,910
Book Value - Within 1 to 5 years | 5,302,786 | 7,093,508
Book Value | 7,374,072 | 7,693,418
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 | 0 | 0
Net of Allowance |  |
Net of Allowance - Within 1 Year | 2,071,286 | 599,910
Net of Allowance - After 1 to 5 Years | 5,302,786 | 7,093,508
Net of Allowance | 7,374,072 | 7,693,418
Gross unrecognized gains |  |
Gross unrealized gains - Within 1 year | 2,554 | 0
Gross unrealized gains - After 1 to 5 years | 29,216 | 0
Gross Unrealized Gains | 31,770 | 0
Gross unrealized losses |  |
Gross unrealized losses - Within 1 year | 762 | 4,498
Gross unrealized losses - After 1 to 5 years | 0 | 65,096
Gross Unrealized Losses | 762 | 69,594
Fair Value |  |
Fair Value - within 1 year | 2,073,078 | 595,412
Fair Value - After 1 to 5 years | 5,332,002 | 7,028,412
Fair value | $ 7,405,080 | $ 7,623,824
Weighted Average Yield |  |
Weighted average yield - Within 1 Year | 1.50% | 2.76%
Weighted average yield - After 1 to 5 years | 1.24% | 1.28%
Weighted Average Yield | 1.31% | 1.39%
Obligations of Puerto Rico, States and political subdivisions |  |
Amortized cost |  |
Amortized cost - Within 1 year | $ 2,605 | $ 2,440
Amortized cost - After 1 to 5 year | 12,530 | 16,454
Amortized cost - After 5 to 10 years | 450 | 655
Amortized cost - After 10 years | 36,012 | 37,633
Amortized cost | 51,597 | 57,182
Book Value |  |
Book Value - within 1 year | 2,605 | 2,440
Book Value - Within 1 to 5 years | 12,530 | 16,454
Book Value - After 5 to 10 years | 450 | 655
Book Value - After 10 years | 36,012 | 37,633
Book Value | 51,597 | 57,182
Allowance for credit losses |  |
Allowance for credit losses - Within 1 Year | 9 | 5
Allowance for credit losses - After 1 to 5 years | 44 | 80
Allowance for credit losses - After 5 to 10 years | 15 | 22
Allowance for credit losses - After 10 years | 5,769 | 5,210
Allowance for credit losses | 5,837 | 5,317
Net of Allowance |  |
Net of Allowance - Within 1 Year | 2,596 | 2,435
Net of Allowance - After 1 to 5 Years | 12,486 | 16,374
Net of Allowance - After 5 to 10 Years | 435 | 633
Net of Allowance - After 10 Years | 30,243 | 32,423
Net of Allowance | 45,760 | 51,865
Gross unrecognized gains |  |
Gross unrealized gains - Within 1 year | 7 | 3
Gross unrealized gains - After 1 to 5 years | 28 | 47
Gross unrealized gains - After 5 to 10 years | 15 | 20
Gross unrealized gains - After 10 years | 3,205 | 2,318
Gross Unrealized Gains | 3,255 | 2,388
Gross unrealized losses |  |
Gross unrealized losses - Within 1 year | 0 | 0
Gross unrealized losses - After 1 to 5 years | 80 | 80
Gross unrealized losses - After 5 to 10 years | 0 | 0
Gross unrealized losses - After 10 years | 1,802 | 2,596
Gross Unrealized Losses | 1,882 | 2,676
Fair Value |  |
Fair Value - within 1 year | 2,603 | 2,438
Fair Value - After 1 to 5 years | 12,434 | 16,341
Fair Value - After 5 to 10 years | 450 | 653
Fair Value - After 10 years | 31,646 | 32,145
Fair value | $ 47,133 | $ 51,577
Weighted Average Yield |  |
Weighted average yield - Within 1 Year | 6.43% | 6.39%
Weighted average yield - After 1 to 5 years | 3.48% | 3.69%
Weighted average yield - After 5 to 10 years | 5.81% | 5.81%
Weighted average yield - After 10 years | 1.42% | 1.42%
Weighted Average Yield | 2.21% | 2.34%
Collateralized Mortgage Obligations - Federal agencies |  |
Amortized cost |  |
Amortized cost - After 10 years | $ 1,506 | $ 1,518
Amortized cost | 1,506 | 1,518
Book Value |  |
Book Value - After 10 years | 1,506 | 1,518
Book Value | 1,506 | 1,518
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 | 1,506 | 1,518
Net of Allowance | 1,506 | 1,518
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 | 191 | 214
Gross Unrealized Losses | 191 | 214
Fair Value |  |
Fair Value - After 10 years | 1,315 | 1,304
Fair value | $ 1,315 | $ 1,304
Weighted Average Yield |  |
Weighted average yield - After 10 years | 2.87% | 2.87%
Weighted Average Yield | 2.87% | 2.87%
Securities in wholly owned statutory business trusts |  |
Amortized cost |  |
Amortized cost - After 5 to 10 years | $ 5,960 | $ 5,959
Amortized cost | 5,960 | 5,959
Book Value |  |
Book Value - After 5 to 10 years | 5,960 | 5,959
Book Value | 5,960 | 5,959
Allowance for credit losses |  |
Allowance for credit losses - After 5 to 10 years | 0 | 0
Allowance for credit losses | 0 | 0
Net of Allowance |  |
Net of Allowance - After 5 to 10 Years | 5,960 | 5,959
Net of Allowance | 5,960 | 5,959
Gross unrecognized gains |  |
Gross unrealized gains - After 5 to 10 years | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross unrealized losses |  |
Gross unrealized losses - After 5 to 10 years | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value |  |
Fair Value - After 5 to 10 years | 5,960 | 5,959
Fair value | $ 5,960 | $ 5,959
Weighted Average Yield |  |
Weighted average yield - After 5 to 10 years | 6.33% | 6.33%
Weighted Average Yield | 6.33% | 6.33%

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