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Investments (Tables) | 6 Months Ended
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Jun. 30, 2026
Investments [Abstract] |
Debt Securities, Available-for-sale | The aggregate carrying and approximate fair values of investment securities follow (in thousands). Fair values are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable financial instruments.
| June 30, 2026 | December 31, 2025
Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Securities available-for-sale: |  |  |  |  |  |  |  |
Obligations of states and |  |  |  |  |  |  |  |
political subdivisions | $ | 185,915 |  | $ | 905 |  | $ | 9,486 |  | $ | 177,334 |  | $ | 189,276 |  | $ | 538 |  | $ | 10,090 |  | $ | 179,724 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. government agencies | 1,371,095 |  | 2,395 |  | 99,894 |  | 1,273,596 |  | 1,387,057 |  | 7,836 |  | 97,104 |  | 1,297,789 |
Private label | 5,055 |  | — |  | 72 |  | 4,983 |  | 5,068 |  | — |  | 36 |  | 5,032 |
Trust preferred securities | 4,616 |  | — |  | 78 |  | 4,538 |  | 4,612 |  | — |  | 188 |  | 4,424 |
Corporate securities | 16,630 |  | 203 |  | 559 |  | 16,274 |  | 16,708 |  | 172 |  | 491 |  | 16,389 |
Total Securities Available-for-Sale | $ | 1,583,311 |  | $ | 3,503 |  | $ | 110,089 |  | $ | 1,476,725 |  | $ | 1,602,721 |  | $ | 8,546 |  | $ | 107,909 |  | $ | 1,503,358 |
Gross Unrealized Losses And Fair Value Of Investments | The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
| June 30, 2026
Less Than Twelve Months | Twelve Months or Greater | Total
Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss
Securities available-for-sale: |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 5,612 |  | $ | 57 |  | $ | 122,499 |  | $ | 9,429 |  | $ | 128,111 |  | $ | 9,486 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 267,591 |  | 1,870 |  | 759,466 |  | 98,024 |  | 1,027,057 |  | 99,894 |
Private label | — |  | — |  | 4,983 |  | 72 |  | 4,983 |  | 72 |
Trust preferred securities | — |  | — |  | 4,538 |  | 78 |  | 4,538 |  | 78 |
Corporate securities | — |  | — |  | 14,391 |  | 559 |  | 14,391 |  | 559 |
Total available-for-sale | $ | 273,203 |  | $ | 1,927 |  | $ | 905,877 |  | $ | 108,162 |  | $ | 1,179,080 |  | $ | 110,089 |
| December 31, 2025
Less Than Twelve Months | Twelve Months or Greater | Total
Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss
Securities available-for-sale: |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 4,746 |  | $ | 29 |  | $ | 129,347 |  | $ | 10,061 |  | $ | 134,093 |  | $ | 10,090 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 48,555 |  | 140 |  | 803,686 |  | 96,964 |  | 852,241 |  | 97,104 |
Private label | — |  | — |  | 5,032 |  | 36 |  | 5,032 |  | 36 |
Trust preferred securities | 4,424 |  | 188 |  | — |  | — |  | 4,424 |  | 188 |
Corporate securities | — |  | — |  | 14,559 |  | 491 |  | 14,559 |  | 491 |
Total available-for-sale | $ | 57,725 |  | $ | 357 |  | $ | 952,624 |  | $ | 107,552 |  | $ | 1,010,349 |  | $ | 107,909 |
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity | The amortized cost and estimated fair value of debt securities at June 30, 2026, by contractual maturity, is shown in the following table (in thousands). Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties. Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.
| Amortized Cost | Estimated Fair Value
Available-for-Sale Debt Securities |  |
Due in one year or less | $ | 11,206 |  | $ | 11,152 |
Due after one year through five years | 136,577 |  | 131,964 |
Due after five years through ten years | 274,754 |  | 260,776 |
Due after ten years | 1,160,774 |  | 1,072,833 |
Total | $ | 1,583,311 |  | $ | 1,476,725 |
Gross Gains And Losses Realized | Proceeds from sales, gross gains and gross losses recognized by the Company from investment security transactions are summarized in the table below (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2026 | 2025 |  | 2026 | 2025
Proceeds on sales of available for sale securities | $ | — |  | $ | 14,882 |  |  | $ | — |  | $ | 14,882 |
Gross realized gains on available for sale securities sold | $ | — |  | $ | 237 |  |  | $ | — |  | $ | 237 |
Gross realized losses on available for sale securities sold | — |  | (87) |  |  | — |  | (87) |
Net realized available for sale securities gains (losses) | $ | — |  | $ | 150 |  |  | $ | — |  | $ | 150 |
Gross unrealized gains recognized on equity securities still held | $ | 109 |  | $ | 26 |  |  | $ | 99 |  | $ | 62 |
Gross unrealized losses recognized on equity securities still held | (51) |  | (289) |  |  | (34) |  | (330) |
Net unrealized (losses) gains recognized on equity securities still held | $ | 58 |  | $ | (263) |  |  | $ | 65 |  | $ | (268) |

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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 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: 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 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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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References Reference 1: 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 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B + Details
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