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SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost and Estimated Fair Value of Securities Available for Sale | Amortized cost and estimated fair value of securities available for sale are as follows (in thousands):
|  | September 30, 2021
|  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
U.S. Treasury notes and bonds |  | $ | 40,499 |  |  | $ | — |  |  | $ | 162 |  |  | $ | 40,337 |
Mortgage-backed securities, residential |  | 588,555 |  |  | 5,397 |  |  | 7,826 |  |  | 586,126 |
Obligations of states and political subdivisions |  | 40,331 |  |  | 2,021 |  |  | — |  |  | 42,352 |
Corporate bonds and notes |  | 17,000 |  |  | 116 |  |  | 55 |  |  | 17,061 |
SBA loan pools |  | 75,612 |  |  | 398 |  |  | 355 |  |  | 75,655 |
Total |  | $ | 761,997 |  |  | $ | 7,932 |  |  | $ | 8,398 |  |  | $ | 761,531 |
|  | 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 |
Schedule of Amortized Cost and Estimated Fair Value of Securities Held to Maturity | Amortized cost and estimated fair value of securities held to maturity are as follows (in thousands):
|  | September 30, 2021
|  | Amortized Cost |  | Unrecognized Gains |  | Unrecognized Losses |  | Estimated Fair Value
Obligations of states and political subdivisions |  | $ | 1,300 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,300 |
Time deposits with other financial institutions |  | 1,883 |  |  | 11 |  |  | — |  |  | 1,894 |
Total |  | $ | 3,183 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 3,194 |
|  | 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 |
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity | 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):
|  | September 30, 2021
|  | Available for Sale |  | Held to Maturity
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Within one year |  | $ | 686 |  |  | $ | 689 |  |  | $ | 1,523 |  |  | $ | 1,532 |
After one, but within five years |  | 75,962 |  |  | 77,278 |  |  | 860 |  |  | 862 |
After five, but within ten years |  | 20,712 |  |  | 21,285 |  |  | 800 |  |  | 800 |
After ten years |  | 470 |  |  | 498 |  |  | — |  |  | — |
|  | 97,830 |  |  | 99,750 |  |  | 3,183 |  |  | 3,194 |
Mortgage-backed securities, residential |  | 588,555 |  |  | 586,126 |  |  | — |  |  | — |
SBA loan pools |  | 75,612 |  |  | 75,655 |  |  | — |  |  | — |
Total |  | $ | 761,997 |  |  | $ | 761,531 |  |  | $ | 3,183 |  |  | $ | 3,194 |
Schedule of Investment Securities Available for Sale in an Unrealized Loss Position | The following tables summarize the investment securities available for sale with unrealized losses at September 30, 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
September 30, 2021 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury notes and bonds | $ | 24,819 |  |  | $ | 162 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,819 |  |  | $ | 162 |
Mortgage-backed securities, residential | 383,380 |  |  | 7,707 |  |  | 4,146 |  |  | 119 |  |  | 387,526 |  |  | 7,826 |
Corporate bonds and notes | 2,979 |  |  | 21 |  |  | 2,966 |  |  | 34 |  |  | 5,945 |  |  | 55 |
SBA loan pools | 39,140 |  |  | 283 |  |  | 6,273 |  |  | 72 |  |  | 45,413 |  |  | 355 |
Total temporarily impaired securities | $ | 450,318 |  |  | $ | 8,173 |  |  | $ | 13,385 |  |  | $ | 225 |  |  | $ | 463,703 |  |  | $ | 8,398 |
| 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 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 + Details
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