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Investment in Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investment Securities | The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:
| June 30, 2025
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
State and political subdivisions | $ | 208,709 |  |  | $ | 157 |  |  | $ | (14,174) |  |  | $ | 194,692 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 365,860 |  |  | 1,427 |  |  | (28,218) |  |  | 339,069 |
Corporate bonds | 39,024 |  |  | 1 |  |  | (2,550) |  |  | 36,475 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 29,795 |  |  | — |  |  | (490) |  |  | 29,305 |
Total | $ | 643,388 |  |  | $ | 1,585 |  |  | $ | (45,432) |  |  | $ | 599,541 |
| December 31, 2024
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
State and political subdivisions | $ | 188,933 |  |  | $ | 4 |  |  | $ | (16,973) |  |  | $ | 171,964 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 267,359 |  |  | 11 |  |  | (34,095) |  |  | 233,275 |
Corporate bonds | 95,841 |  |  | 3 |  |  | (8,058) |  |  | 87,786 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 35,575 |  |  | — |  |  | (579) |  |  | 34,996 |
Total | $ | 587,708 |  |  | $ | 18 |  |  | $ | (59,705) |  |  | $ | 528,021 |
Schedule of Unrealized Loss on Investments | The fair values of investment securities with unrealized losses are as follows:
| June 30, 2025
| Less than 12 months |  | 12 months or more |  | Total
(In thousands) | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
State and political subdivisions | $ | 16,938 |  |  | $ | 87 |  |  | $ | 153,575 |  |  | $ | 14,087 |  |  | $ | 170,513 |  |  | $ | 14,174 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 70,155 |  |  | 724 |  |  | 131,594 |  |  | 27,494 |  |  | 201,749 |  |  | 28,218 |
Corporate bonds | 2,999 |  |  | 1 |  |  | 28,475 |  |  | 2,549 |  |  | 31,474 |  |  | 2,550 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | — |  |  | — |  |  | 29,305 |  |  | 490 |  |  | 29,305 |  |  | 490 |
Total | $ | 90,092 |  |  | $ | 812 |  |  | $ | 342,949 |  |  | $ | 44,620 |  |  | $ | 433,041 |  |  | $ | 45,432 |
| December 31, 2024
| Less than 12 months |  | 12 months or more |  | Total
(In thousands) | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
State and political subdivisions | $ | 4,082 |  |  | $ | 8 |  |  | $ | 163,893 |  |  | $ | 16,964 |  |  | $ | 167,975 |  |  | $ | 16,972 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 85,272 |  |  | 2,086 |  |  | 139,676 |  |  | 32,009 |  |  | 224,948 |  |  | 34,095 |
Corporate bonds | 7,901 |  |  | 99 |  |  | 66,860 |  |  | 7,960 |  |  | 74,761 |  |  | 8,059 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | — |  |  | — |  |  | 30,575 |  |  | 579 |  |  | 30,575 |  |  | 579 |
Total | $ | 97,255 |  |  | $ | 2,193 |  |  | $ | 401,004 |  |  | $ | 57,512 |  |  | $ | 498,259 |  |  | $ | 59,705 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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