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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Securities Financing Transactions Disclosures [Abstract] |
Unrealized Gain (Loss) on Investments | The amortized cost and fair value on investment securities as of December 31 are as follows:
(In thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
2022 |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |
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 debt securities: |  |  |  |  |  |  |
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 |
(In thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
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 Investments in a Continuous Unrealized Loss Position | The following table presents gross unrealized losses and fair value of investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2022 and 2021.
(Dollars in thousands) | Less Than 12 Months |  | 12 Months or More |  | Total
December 31, 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 | 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 debt securities | 106 |  | 194,377 |  |  | 16,314 |  |  | 30 |  | 40,250 |  |  | 8,150 |  |  | 136 |  | 234,627 |  |  | 24,464 |
Held-to-maturity debt 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 debt 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 |
(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 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 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 |
Schedule of Gross Realized Gains (Losses) on Sales of Available-For-Sale Securities | The following table presents information related to gross realized gains and losses on sales of AFS securities:
| For the year ended December 31,
(In thousands) | 2022 |  | 2021 |  | 2020
Gross realized gains | $ | — |  |  | $ | 79 |  |  | $ | 479 |
Gross realized losses | — |  |  | — |  |  | (12) |
Net gains | $ | — |  |  | $ | 79 |  |  | $ | 467 |
Investments Classified by Contractual Maturity Date | The table below illustrates the maturity distribution of investment securities at amortized cost and fair value at December 31, 2022.
(In thousands) | Available-for-sale |  | Held-to-maturity
December 31, 2022 | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in 1 year or less | $ | 250 |  |  | $ | 250 |  |  | $ | 3,745 |  |  | $ | 3,719 |
Due after 1 year but within 5 years | 41,289 |  |  | 39,865 |  |  | 87,184 |  |  | 81,927 |
Due after 5 years but within 10 years | 31,942 |  |  | 28,555 |  |  | 214,469 |  |  | 183,635 |
Due after 10 years | 2,868 |  |  | 2,293 |  |  | 43,386 |  |  | 35,190 |
| 76,349 |  |  | 70,963 |  |  | 348,784 |  |  | 304,471 |
Mortgage-backed securities | 185,993 |  |  | 166,915 |  |  | 50,710 |  |  | 44,034 |
| $ | 262,342 |  |  | $ | 237,878 |  |  | $ | 399,494 |  |  | $ | 348,505 |

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