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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, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Amortized cost |  |  |  |
Amortized cost | $ 89,725 | $ 92,621 |  |
Allowance for credit losses |  |  |  |
Less - Allowance for credit losses | 10,096 | 10,261 |  |
Net of Allowance |  |  |  |
Net of Allowance | 79,629 | 82,360 |  |
Gross unrecognized gains |  |  |  |
Gross Unrealized Gains | 13,014 | 12,554 |  |
Gross unrealized losses |  |  |  |
Gross Unrealized Losses | 0 | 23 |  |
Fair Value |  |  |  |
Fair value | $ 92,643 | $ 94,891 |  |
Weighted Average Yield |  |  |  |
Weighted Average Yield | 3.29% | 3.38% |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Amortized cost |  |  |  |
Amortized cost - Within 1 year | $ 4,165 | $ 3,990 |  |
Amortized cost - After 1 to 5 years | 14,765 | 16,030 |  |
Amortized cost - After 5 to 10 years | 13,210 | 14,845 |  |
Amortized cost - After 10 years | 45,993 | 46,164 |  |
Amortized cost | 78,133 | 81,029 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - Within 1 Year | 69 | 50 |  |
Allowance for credit losses - After 1 to 5 years | 619 | 710 |  |
Allowance for credit losses - After 5 to 10 years | 440 | 573 |  |
Allowance for credit losses - After 10 years | 8,968 | 8,928 |  |
Less - Allowance for credit losses | 10,096 | 10,261 | $ 13,390 | $ 0
Net of Allowance |  |  |  |
Net of Allowance - Within 1 Year | 4,096 | 3,940 |  |
Net of Allowance - After 1 to 5 Years | 14,146 | 15,320 |  |
Net of Allowance - After 5 to 10 Years | 12,770 | 14,272 |  |
Net of Allowance - After 10 Years | 37,025 | 37,236 |  |
Net of Allowance | 68,037 | 70,768 |  |
Gross unrecognized gains |  |  |  |
Gross unrealized gains - Within 1 year | 69 | 47 |  |
Gross unrealized gains - After 1 to 5 years | 619 | 710 |  |
Gross unrealized gains - After 5 to 10 years | 235 | 295 |  |
Gross unrealized gains - After 10 years | 12,090 | 11,501 |  |
Gross Unrealized Gains | 13,013 | 12,553 |  |
Gross unrealized losses |  |  |  |
Gross unrealized losses - Within 1 year | 0 | 0 |  |
Gross unrealized losses - After 1 to 5 years | 0 | 0 |  |
Gross unrealized losses - After 5 to 10 years | 0 | 23 |  |
Gross unrealized losses - After 10 years | 0 | 0 |  |
Gross Unrealized Losses | 0 | 23 |  |
Fair Value |  |  |  |
Fair Value - within 1 year | 4,165 | 3,987 |  |
Fair Value - After 1 to 5 years | 14,765 | 16,030 |  |
Fair Value - After 5 to 10 years | 13,005 | 14,544 |  |
Fair Value - After 10 years | 49,115 | 48,737 |  |
Fair value | $ 81,050 | $ 83,298 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - Within 1 Year | 6.07% | 6.05% |  |
Weighted average yield - After 1 to 5 years | 6.20% | 6.16% |  |
Weighted average yield - After 5 to 10 years | 2.33% | 2.77% |  |
Weighted average yield - After 10 years | 1.57% | 1.58% |  |
Weighted Average Yield | 2.81% | 2.93% |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Amortized cost |  |  |  |
Amortized cost - After 1 to 5 years | $ 31 | $ 31 |  |
Amortized cost | 31 | 31 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - After 1 to 5 years | 0 | 0 |  |
Less - Allowance for credit losses | 0 | 0 |  |
Net of Allowance |  |  |  |
Net of Allowance - After 1 to 5 Years | 31 | 31 |  |
Net of Allowance | 31 | 31 |  |
Gross unrecognized gains |  |  |  |
Gross unrealized gains - After 1 to 5 years | 1 | 1 |  |
Gross Unrealized Gains | 1 | 1 |  |
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 | 32 | 32 |  |
Fair value | $ 32 | $ 32 |  |
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 | $ 11,561 | $ 11,561 |  |
Amortized cost | 11,561 | 11,561 |  |
Allowance for credit losses |  |  |  |
Allowance for credit losses - After 10 years | 0 | 0 |  |
Less - Allowance for credit losses | 0 | 0 |  |
Net of Allowance |  |  |  |
Net of Allowance - After 10 Years | 11,561 | 11,561 |  |
Net of Allowance | 11,561 | 11,561 |  |
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 | 11,561 | 11,561 |  |
Fair value | $ 11,561 | $ 11,561 |  |
Weighted Average Yield |  |  |  |
Weighted average yield - After 10 years | 6.51% | 6.51% |  |
Weighted Average Yield | 6.51% | 6.51% |  |

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