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SECURITIES | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
SECURITIES | SECURITIES Amortized cost and estimated fair value of securities available for sale are as follows (in thousands):
|  | March 31, 2021
|  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Obligations of U.S. Government and U.S. Government sponsored enterprises |  | $ | 610 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 611 |
Mortgage-backed securities, residential |  | 523,974 |  |  | 5,698 |  |  | 9,175 |  |  | 520,497 |
Obligations of states and political subdivisions |  | 40,630 |  |  | 2,192 |  |  | — |  |  | 42,822 |
Corporate bonds and notes |  | 9,000 |  |  | 112 |  |  | 36 |  |  | 9,076 |
SBA loan pools |  | 53,364 |  |  | 52 |  |  | 227 |  |  | 53,189 |
Total |  | $ | 627,578 |  |  | $ | 8,055 |  |  | $ | 9,438 |  |  | $ | 626,195 |
|  | December 31, 2020
|  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Mortgage-backed securities, residential |  | $ | 458,245 |  |  | $ | 9,822 |  |  | $ | 201 |  |  | $ | 467,866 |
Obligations of states and political subdivisions |  | 40,662 |  |  | 2,743 |  |  | — |  |  | 43,405 |
Corporate bonds and notes |  | 9,000 |  |  | 47 |  |  | 12 |  |  | 9,035 |
SBA loan pools |  | 34,455 |  |  | 42 |  |  | 192 |  |  | 34,305 |
Total |  | $ | 542,362 |  |  | $ | 12,654 |  |  | $ | 405 |  |  | $ | 554,611 |
Amortized cost and estimated fair value of securities held to maturity are as follows (in thousands):
|  | March 31, 2021
|  | Amortized Cost |  | Unrecognized Gains |  | Unrecognized Losses |  | Estimated Fair Value
Obligations of states and political subdivisions |  | $ | 316 |  |  | $ | — |  |  | $ | — |  |  | $ | 316 |
Time deposits with other financial institutions |  | 2,137 |  |  | 29 |  |  | — |  |  | 2,166 |
Total |  | $ | 2,453 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 2,482 |
|  | December 31, 2020
|  | Amortized Cost |  | Unrecognized Gains |  | Unrecognized Losses |  | Estimated Fair Value
Obligations of states and political subdivisions |  | $ | 326 |  |  | $ | — |  |  | $ | — |  |  | $ | 326 |
Time deposits with other financial institutions |  | 2,143 |  |  | 32 |  |  | — |  |  | 2,175 |
Total |  | $ | 2,469 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 2,501 |
The amortized cost and estimated fair value of debt securities are shown below by expected maturity. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately (in thousands):
|  | March 31, 2021
|  | Available for Sale |  | Held to Maturity
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Within one year |  | $ | 610 |  |  | $ | 611 |  |  | $ | 1,064 |  |  | $ | 1,074 |
After one, but within five years |  | 31,385 |  |  | 32,858 |  |  | 1,389 |  |  | 1,408 |
After five, but within ten years |  | 17,487 |  |  | 18,234 |  |  | — |  |  | — |
After ten years |  | 758 |  |  | 806 |  |  | — |  |  | — |
|  | 50,240 |  |  | 52,509 |  |  | 2,453 |  |  | 2,482 |
Mortgage-backed securities, residential |  | 523,974 |  |  | 520,497 |  |  | — |  |  | — |
SBA loan pools |  | 53,364 |  |  | 53,189 |  |  | — |  |  | — |
Total |  | $ | 627,578 |  |  | $ | 626,195 |  |  | $ | 2,453 |  |  | $ | 2,482 |
There were no proceeds from sales and calls of securities resulting in gains or losses for the three months ended March 31, 2021 and 2020. The following tables summarize the investment securities available for sale with unrealized losses at March 31, 2021 and December 31, 2020 by aggregated major security type and length of time in a continuous unrealized loss position (in thousands):
| Less than 12 months |  | 12 months or longer |  | Total
March 31, 2021 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Mortgage-backed securities, residential | $ | 339,140 |  |  | $ | 9,175 |  |  | $ | — |  |  | $ | — |  |  | $ | 339,140 |  |  | $ | 9,175 |
Corporate bonds and notes | 2,964 |  |  | 36 |  |  | — |  |  | — |  |  | 2,964 |  |  | 36 |
SBA loan pools | 23,172 |  |  | 131 |  |  | 11,470 |  |  | 96 |  |  | 34,642 |  |  | 227 |
Total temporarily impaired securities | $ | 365,276 |  |  | $ | 9,342 |  |  | $ | 11,470 |  |  | $ | 96 |  |  | $ | 376,746 |  |  | $ | 9,438 |
| Less than 12 months |  | 12 months or longer |  | Total
December 31, 2020 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Mortgage-backed securities, residential | $ | 70,037 |  |  | $ | 200 |  |  | $ | 970 |  |  | $ | 1 |  |  | $ | 71,007 |  |  | $ | 201 |
Corporate bonds and notes | 2,988 |  |  | 12 |  |  | — |  |  | — |  |  | 2,988 |  |  | 12 |
SBA loan pools | 15,245 |  |  | 156 |  |  | 3,636 |  |  | 36 |  |  | 18,881 |  |  | 192 |
Total temporarily impaired securities | $ | 88,270 |  |  | $ | 368 |  |  | $ | 4,606 |  |  | $ | 37 |  |  | $ | 92,876 |  |  | $ | 405 |
Other-Than-Temporary Impairment As of March 31, 2021, the Corporation’s unrealized and unrecognized losses were not material.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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