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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Securities Financing Transactions Disclosures [Abstract] |
Unrealized Gain (Loss) on Investments | The amortized cost and estimated fair value of investment securities for the periods presented:
| September 30, 2023
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available-for-sale |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | $ | 36,609 |  |  | $ | — |  |  | $ | 1,878 |  |  | $ | 34,731 |
Mortgage-backed U.S. government agencies | 173,060 |  |  | — |  |  | 24,416 |  |  | 148,644 |
State and political subdivision obligations | 4,338 |  |  | — |  |  | 1,026 |  |  | 3,312 |
Corporate debt securities | 35,729 |  |  | — |  |  | 4,352 |  |  | 31,377 |
Total available-for-sale debt securities | 249,736 |  |  | — |  |  | 31,672 |  |  | 218,064 |
Held-to-maturity |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | $ | 245,771 |  |  | $ | — |  |  | $ | 40,363 |  |  | $ | 205,408 |
Mortgage-backed U.S. government agencies | 45,374 |  |  | — |  |  | 7,614 |  |  | 37,760 |
State and political subdivision obligations | 84,942 |  |  | — |  |  | 11,330 |  |  | 73,612 |
Corporate debt securities | 25,474 |  |  | — |  |  | 1,248 |  |  | 24,226 |
Total held-to-maturity debt securities | 401,561 |  |  | — |  |  | 60,555 |  |  | 341,006 |
Total | $ | 651,297 |  |  | $ | — |  |  | $ | 92,227 |  |  | $ | 559,070 |
| December 31, 2022
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available-for-sale |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | $ | 36,528 |  |  | $ | — |  |  | $ | 1,614 |  |  | $ | 34,914 |
Mortgage-backed U.S. government agencies | 185,993 |  |  | — |  |  | 19,078 |  |  | 166,915 |
State and political subdivision obligations | 4,354 |  |  | — |  |  | 815 |  |  | 3,539 |
Corporate debt securities | 35,467 |  |  | — |  |  | 2,957 |  |  | 32,510 |
Total available-for-sale debt securities | $ | 262,342 |  |  | $ | — |  |  | $ | 24,464 |  |  | $ | 237,878 |
Held-to-maturity |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | $ | 245,671 |  |  | $ | — |  |  | $ | 34,834 |  |  | $ | 210,837 |
Mortgage-backed U.S. government agencies | 50,710 |  |  | — |  |  | 6,676 |  |  | 44,034 |
State and political subdivision obligations | 87,125 |  |  | — |  |  | 8,345 |  |  | 78,780 |
Corporate debt securities | 15,988 |  |  | — |  |  | 1,134 |  |  | 14,854 |
Total held-to-maturity debt securities | 399,494 |  |  | — |  |  | 50,989 |  |  | 348,505 |
Total | $ | 661,836 |  |  | $ | — |  |  | $ | 75,453 |  |  | $ | 586,383 |
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 investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented:
(Dollars in thousands) | Less Than 12 Months |  | 12 Months or More |  | Total
September 30, 2023 | Number of Securities |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Number of Securities |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Number of Securities |  | Estimated Fair Value |  | Gross Unrealized Losses
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | — |  | $ | — |  |  | $ | — |  |  | 19 |  | $ | 34,731 |  |  | $ | 1,878 |  |  | 19 |  | $ | 34,731 |  |  | $ | 1,878 |
Mortgage-backed U.S. government agencies | 1 |  | 1,455 |  |  | 122 |  |  | 92 |  | 147,189 |  |  | 24,294 |  |  | 93 |  | 148,644 |  |  | 24,416 |
State and political subdivision obligations | — |  | — |  |  | — |  |  | 8 |  | 3,312 |  |  | 1,026 |  |  | 8 |  | 3,312 |  |  | 1,026 |
Corporate debt securities | — |  | — |  |  | — |  |  | 18 |  | 31,377 |  |  | 4,352 |  |  | 18 |  | 31,377 |  |  | 4,352 |
Total available-for-sale debt securities | 1 |  | $ | 1,455 |  |  | $ | 122 |  |  | 137 |  | $ | 216,609 |  |  | $ | 31,550 |  |  | 138 |  | $ | 218,064 |  |  | $ | 31,672 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | 4 |  | 5,627 |  |  | 858 |  |  | 141 |  | 199,781 |  |  | 39,505 |  |  | 145 |  | 205,408 |  |  | 40,363 |
Mortgage-backed U.S. government agencies | 2 |  | 971 |  |  | 61 |  |  | 62 |  | 36,789 |  |  | 7,553 |  |  | 64 |  | 37,760 |  |  | 7,614 |
State and political subdivision obligations | 5 |  | 1,568 |  |  | 463 |  |  | 194 |  | 72,044 |  |  | 10,867 |  |  | 199 |  | 73,612 |  |  | 11,330 |
Corporate debt securities | — |  | — |  |  | — |  |  | 15 |  | 24,226 |  |  | 1,248 |  |  | 15 |  | 24,226 |  |  | 1,248 |
Total held-to-maturity debt securities | 11 |  | 8,166 |  |  | 1,382 |  |  | 412 |  | 332,840 |  |  | 59,173 |  |  | 423 |  | 341,006 |  |  | 60,555 |
Total | 12 |  | $ | 9,621 |  |  | $ | 1,504 |  |  | 549 |  | $ | 549,449 |  |  | $ | 90,723 |  |  | 561 |  | $ | 559,070 |  |  | $ | 92,227 |
(Dollars in thousands) | Less Than 12 Months |  | 12 Months or More |  | Total
December 31, 2022 | Number of Securities |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Number of Securities |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Number of Securities |  | Estimated Fair Value |  | Gross Unrealized Losses
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | 19 |  | $ | 34,914 |  |  | $ | 1,614 |  |  | — |  | $ | — |  |  | $ | — |  |  | 19 |  | $ | 34,914 |  |  | $ | 1,614 |
Mortgage-backed U.S. government agencies | 69 |  | 131,879 |  |  | 11,876 |  |  | 24 |  | 35,036 |  |  | 7,202 |  |  | 93 |  | 166,915 |  |  | 19,078 |
State and political subdivision obligations | 6 |  | 2,521 |  |  | 671 |  |  | 2 |  | 1,018 |  |  | 144 |  |  | 8 |  | 3,539 |  |  | 815 |
Corporate debt securities | 12 |  | 25,063 |  |  | 2,153 |  |  | 4 |  | 4,196 |  |  | 804 |  |  | 16 |  | 29,259 |  |  | 2,957 |
Total available-for-sale securities | 106 |  | 194,377 |  |  | 16,314 |  |  | 30 |  | 40,250 |  |  | 8,150 |  |  | 136 |  | 234,627 |  |  | 24,464 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies | 54 |  | $ | 84,946 |  |  | $ | 10,093 |  |  | 91 |  | $ | 125,891 |  |  | $ | 24,741 |  |  | 145 |  | $ | 210,837 |  |  | $ | 34,834 |
Mortgage-backed U.S. government agencies | 40 |  | 13,866 |  |  | 1,071 |  |  | 24 |  | 30,168 |  |  | 5,605 |  |  | 64 |  | 44,034 |  |  | 6,676 |
State and political subdivision obligations | 185 |  | 73,735 |  |  | 7,413 |  |  | 18 |  | 4,616 |  |  | 932 |  |  | 203 |  | 78,351 |  |  | 8,345 |
Corporate debt securities | 4 |  | 5,721 |  |  | 317 |  |  | 5 |  | 5,182 |  |  | 817 |  |  | 9 |  | 10,903 |  |  | 1,134 |
Total held to maturity securities | 283 |  | 178,268 |  |  | 18,894 |  |  | 138 |  | 165,857 |  |  | 32,095 |  |  | 421 |  | 344,125 |  |  | 50,989 |
Total | 389 |  | $ | 372,645 |  |  | $ | 35,208 |  |  | 168 |  | $ | 206,107 |  |  | $ | 40,245 |  |  | 557 |  | $ | 578,752 |  |  | $ | 75,453 |
Investments Classified by Contractual Maturity Date | The table below illustrates the contractual maturity of debt investment securities at amortized cost and estimated fair value. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay with or without call or prepayment penalties.
(In thousands) | Available-for-sale |  | Held-to-maturity
September 30, 2023 | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in 1 year or less | $ | 6,995 |  |  | $ | 6,878 |  |  | $ | 8,076 |  |  | $ | 7,960 |
Due after 1 year but within 5 years | 37,872 |  |  | 36,109 |  |  | 94,702 |  |  | 86,955 |
Due after 5 years but within 10 years | 29,472 |  |  | 24,686 |  |  | 209,213 |  |  | 172,101 |
Due after 10 years | 2,337 |  |  | 1,747 |  |  | 44,196 |  |  | 36,230 |
| 76,676 |  |  | 69,420 |  |  | 356,187 |  |  | 303,246 |
Mortgage-backed securities | 173,060 |  |  | 148,644 |  |  | 45,374 |  |  | 37,760 |
| $ | 249,736 |  |  | $ | 218,064 |  |  | $ | 401,561 |  |  | $ | 341,006 |

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