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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2022
Securities Financing Transactions Disclosures [Abstract] |
Unrealized Gain (Loss) on Investments | The amortized cost, fair value, and unrealized gains and losses on investment securities at September 30, 2022 and December 31, 2021 are as follows:
(Dollars in thousands) |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
September 30, 2022 |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 39,511 |  |  | $ | — |  |  | $ | 1,927 |  |  | $ | 37,584 |
Mortgage-backed U.S. government agencies |  | 187,757 |  |  | — |  |  | 19,553 |  |  | 168,204 |
State and political subdivision obligations |  | 4,360 |  |  | — |  |  | 986 |  |  | 3,374 |
Corporate debt securities |  | 35,468 |  |  | — |  |  | 2,435 |  |  | 33,033 |
Total available-for-sale debt securities |  | 267,096 |  |  | — |  |  | 24,901 |  |  | 242,195 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 245,638 |  |  | $ | 3 |  |  | $ | 36,102 |  |  | $ | 209,539 |
Mortgage-backed U.S. government agencies |  | 52,788 |  |  | — |  |  | 7,325 |  |  | 45,463 |
State and political subdivision obligations |  | 87,724 |  |  | — |  |  | 10,951 |  |  | 76,773 |
Corporate debt securities |  | 15,992 |  |  | — |  |  | 1,142 |  |  | 14,850 |
Total held-to-maturity debt securities |  | 402,142 |  |  | 3 |  |  | 55,520 |  |  | 346,625 |
Total |  | $ | 669,238 |  |  | $ | 3 |  |  | $ | 80,421 |  |  | $ | 588,820 |
(Dollars in thousands) |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
December 31, 2021 |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | $ | 49,760 |  |  | $ | 3 |  |  | $ | 283 |  |  | $ | 49,480 |
State and political subdivision obligations |  | 3,899 |  |  | 26 |  |  | 11 |  |  | 3,914 |
Corporate debt securities |  | 9,525 |  |  | — |  |  | 57 |  |  | 9,468 |
Total available-for-sale debt securities |  | 63,184 |  |  | 29 |  |  | 351 |  |  | 62,862 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 178,136 |  |  | $ | 26 |  |  | $ | 1,165 |  |  | $ | 176,997 |
Mortgage-backed U.S. government agencies |  | 61,157 |  |  | 440 |  |  | 272 |  |  | 61,325 |
State and political subdivision obligations |  | 75,958 |  |  | 2,305 |  |  | 27 |  |  | 78,236 |
Corporate debt securities |  | 14,006 |  |  | 133 |  |  | 71 |  |  | 14,068 |
Total held-to-maturity debt securities |  | 329,257 |  |  | 2,904 |  |  | 1,535 |  |  | 330,626 |
Total |  | $ | 392,441 |  |  | $ | 2,933 |  |  | $ | 1,886 |  |  | $ | 393,488 |
Schedule of Fair Value and Unrealized Loss on Debt Security Investments in a Continuous Unrealized Loss Position | The following tables present gross unrealized losses and fair value of debt security investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2022 and December 31, 2021.
(Dollars in thousands) |  | Less Than 12 Months |  | 12 Months or More |  | Total
September 30, 2022 |  | Number of Securities |  | Fair Value |  | Unrealized Losses |  | Number of Securities |  | Fair Value |  | Unrealized Losses |  | Number of Securities |  | Fair Value |  | Unrealized Losses
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | — |  | $ | — |  |  | $ | — |  |  | 20 |  | $ | 37,584 |  |  | $ | 1,927 |  |  | 20 |  | $ | 37,584 |  |  | $ | 1,927 |
Mortgage-backed U.S. government agencies |  | — |  | — |  |  | — |  |  | 91 |  | 164,216 |  |  | 19,553 |  |  | 91 |  | 164,216 |  |  | 19,553 |
State and political subdivision obligations |  | — |  | — |  |  | — |  |  | 8 |  | 3,374 |  |  | 986 |  |  | 8 |  | 3,374 |  |  | 986 |
Corporate debt securities |  | 3 |  | 2,523 |  |  | 477 |  |  | 14 |  | 27,260 |  |  | 1,958 |  |  | 17 |  | 29,783 |  |  | 2,435 |
Total temporarily impaired available-for-sale debt securities |  | 3 |  | $ | 2,523 |  |  | $ | 477 |  |  | 133 |  | $ | 232,434 |  |  | $ | 24,424 |  |  | 136 |  | $ | 234,957 |  |  | $ | 24,901 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 25 |  | $ | 30,523 |  |  | $ | 7,405 |  |  | 119 |  | $ | 177,014 |  |  | $ | 28,697 |  |  | 144 |  | $ | 207,537 |  |  | $ | 36,102 |
Mortgage-backed U.S. government agencies |  | 1 |  | 316 |  |  | 43 |  |  | 63 |  | 45,147 |  |  | 7,282 |  |  | 64 |  | 45,463 |  |  | 7,325 |
State and political subdivision obligations |  | 12 |  | 2,338 |  |  | 535 |  |  | 194 |  | 74,435 |  |  | 10,416 |  |  | 206 |  | 76,773 |  |  | 10,951 |
Corporate debt securities |  | 5 |  | 5,156 |  |  | 844 |  |  | 3 |  | 4,753 |  |  | 298 |  |  | 8 |  | 9,909 |  |  | 1,142 |
Total temporarily impaired held-to-maturity debt securities |  | 43 |  | 38,333 |  |  | 8,827 |  |  | 379 |  | 301,349 |  |  | 46,693 |  |  | 422 |  | 339,682 |  |  | 55,520 |
Total |  | 46 |  | $ | 40,856 |  |  | $ | 9,304 |  |  | 512 |  | $ | 533,783 |  |  | $ | 71,117 |  |  | 558 |  | $ | 574,639 |  |  | $ | 80,421 |
(Dollars in thousands) |  | Less Than 12 Months |  | 12 Months or More |  | Total
December 31, 2021 |  | Number of Securities |  | Fair Value |  | Unrealized Losses |  | Number of Securities |  | Fair Value |  | Unrealized Losses |  | Number of Securities |  | Fair Value |  | Unrealized Losses
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies |  | 24 |  | $ | 45,476 |  |  | $ | 283 |  |  | — |  | $ | — |  |  | $ | — |  |  | 24 |  | $ | 45,476 |  |  | $ | 283 |
State and political subdivision obligations |  | 2 |  | 1,168 |  |  | 11 |  |  | — |  | — |  |  | — |  |  | 2 |  | 1,168 |  |  | 11 |
Corporate debt securities |  | 4 |  | 4,943 |  |  | 57 |  |  | — |  | — |  |  | — |  |  | 4 |  | 4,943 |  |  | 57 |
Total temporarily impaired available-for-sale securities |  | 30 |  | $ | 51,587 |  |  | $ | 351 |  |  | — |  | $ | — |  |  | $ | — |  |  | 30 |  | $ | 51,587 |  |  | $ | 351 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 91 |  | $ | 149,425 |  |  | $ | 1,165 |  |  | — |  | $ | — |  |  | $ | — |  |  | 91 |  | $ | 149,425 |  |  | $ | 1,165 |
Mortgage-backed U.S. government agencies |  | 24 |  | 39,995 |  |  | 272 |  |  | — |  | — |  |  | — |  |  | 24 |  | 39,995 |  |  | 272 |
State and political subdivision obligations |  | 17 |  | 5,302 |  |  | 25 |  |  | 1 |  | 255 |  |  | 2 |  |  | 18 |  | 5,557 |  |  | 27 |
Corporate debt securities |  | 6 |  | 6,928 |  |  | 71 |  |  | — |  | — |  |  | — |  |  | 6 |  | 6,928 |  |  | 71 |
Total temporarily impaired held to maturity securities |  | 138 |  | 201,650 |  |  | 1,533 |  |  | 1 |  | 255 |  |  | 2 |  |  | 139 |  | 201,905 |  |  | 1,535 |
Total |  | 168 |  | $ | 253,237 |  |  | $ | 1,884 |  |  | 1 |  | $ | 255 |  |  | $ | 2 |  |  | 169 |  | $ | 253,492 |  |  | $ | 1,886 |
Investments Classified by Contractual Maturity Date | The table below illustrates the maturity distribution of investment securities at amortized cost and fair value as of September 30, 2022.
(Dollars in thousands) | Available-for-sale |  | Held-to-maturity
September 30, 2022 | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in 1 year or less | $ | 250 |  |  | $ | 250 |  |  | $ | — |  |  | $ | — |
Due after 1 year but within 5 years | 40,013 |  |  | 38,602 |  |  | 73,579 |  |  | 69,250 |
Due after 5 years but within 10 years | 35,017 |  |  | 32,006 |  |  | 232,023 |  |  | 197,794 |
Due after 10 years | 4,059 |  |  | 3,133 |  |  | 43,752 |  |  | 34,118 |
| 79,339 |  |  | 73,991 |  |  | 349,354 |  |  | 301,162 |
Mortgage-backed securities | 187,757 |  |  | 168,204 |  |  | 52,788 |  |  | 45,463 |
| $ | 267,096 |  |  | $ | 242,195 |  |  | $ | 402,142 |  |  | $ | 346,625 |

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
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