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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, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Amortized cost |  |  |  |  |  |
Amortized cost | $ 85,655 |  | $ 92,621 |  |  |
Allowance for credit losses |  |  |  |  |  |
Less - Allowance for credit losses | 9,222 |  | 10,261 |  |  |
Net of Allowance |  |  |  |  |  |
Net of Allowance | 76,433 |  | 82,360 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross Unrealized Gains | 13,342 |  | 12,554 |  |  |
Gross unrealized losses |  |  |  |  |  |
Gross Unrealized Losses | 0 |  | 23 |  |  |
Fair Value |  |  |  |  |  |
Fair value | $ 89,775 |  | $ 94,891 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted Average Yield | 3.30% |  | 3.38% |  |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - Within 1 year | $ 4,240 |  | $ 3,990 |  |  |
Amortized cost - After 1 to 5 years | 14,395 |  | 16,030 |  |  |
Amortized cost - After 5 to 10 years | 11,280 |  | 14,845 |  |  |
Amortized cost - After 10 years | 44,149 |  | 46,164 |  |  |
Amortized cost | 74,064 |  | 81,029 |  |  |
Allowance for credit losses |  |  |  |  |  |
Allowance for credit losses - Within 1 Year | 46 |  | 50 |  |  |
Allowance for credit losses - After 1 to 5 years | 555 |  | 710 |  |  |
Allowance for credit losses - After 5 to 10 years | 347 |  | 573 |  |  |
Allowance for credit losses - After 10 years | 8,274 |  | 8,928 |  |  |
Less - Allowance for credit losses | 9,222 | $ 10,214 | 10,261 | $ 12,421 | $ 12,735 | $ 0
Net of Allowance |  |  |  |  |  |
Net of Allowance - Within 1 Year | 4,194 |  | 3,940 |  |  |
Net of Allowance - After 1 to 5 Years | 13,840 |  | 15,320 |  |  |
Net of Allowance - After 5 to 10 Years | 10,933 |  | 14,272 |  |  |
Net of Allowance - After 10 Years | 35,875 |  | 37,236 |  |  |
Net of Allowance | 64,842 |  | 70,768 |  |  |
Gross unrecognized gains |  |  |  |  |  |
Gross unrealized gains - Within 1 year | 47 |  | 47 |  |  |
Gross unrealized gains - After 1 to 5 years | 555 |  | 710 |  |  |
Gross unrealized gains - After 5 to 10 years | 194 |  | 295 |  |  |
Gross unrealized gains - After 10 years | 12,545 |  | 11,501 |  |  |
Gross Unrealized Gains | 13,341 |  | 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 | 4,241 |  | 3,987 |  |  |
Fair Value - After 1 to 5 years | 14,395 |  | 16,030 |  |  |
Fair Value - After 5 to 10 years | 11,127 |  | 14,544 |  |  |
Fair Value - After 10 years | 48,420 |  | 48,737 |  |  |
Fair value | $ 78,183 |  | $ 83,298 |  |  |
Weighted Average Yield |  |  |  |  |  |
Weighted average yield - Within 1 Year | 6.09% |  | 6.05% |  |  |
Weighted average yield - After 1 to 5 years | 6.23% |  | 6.16% |  |  |
Weighted average yield - After 5 to 10 years | 2.18% |  | 2.77% |  |  |
Weighted average yield - After 10 years | 1.52% |  | 1.58% |  |  |
Weighted Average Yield | 2.80% |  | 2.93% |  |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |  |  |
Amortized cost |  |  |  |  |  |
Amortized cost - After 1 to 5 years | $ 30 |  | $ 31 |  |  |
Amortized cost | 30 |  | 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 | 30 |  | 31 |  |  |
Net of Allowance | 30 |  | 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 | 31 |  | 32 |  |  |
Fair value | $ 31 |  | $ 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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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Industry Guide -Number 3 -Section II -Paragraph B + Details
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