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Investments (Tables) | 3 Months Ended
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Mar. 31, 2024
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.
| March 31, 2024 | December 31, 2023
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 | $ | 227,434 |  | $ | 217 |  | $ | 17,127 |  | $ | 210,524 |  | $ | 228,456 |  | $ | 371 |  | $ | 16,089 |  | $ | 212,738 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. government agencies | 1,236,587 |  | 1,316 |  | 138,106 |  | 1,099,797 |  | 1,211,484 |  | 2,362 |  | 125,753 |  | 1,088,093 |
Private label | 6,981 |  | — |  | 284 |  | 6,697 |  | 6,997 |  | — |  | 293 |  | 6,704 |
Trust preferred securities | 4,600 |  | — |  | 151 |  | 4,449 |  | 4,599 |  | — |  | 321 |  | 4,278 |
Corporate securities | 27,970 |  | 52 |  | 1,832 |  | 26,190 |  | 28,009 |  | 137 |  | 1,822 |  | 26,324 |
Total Securities Available-for-Sale | $ | 1,503,572 |  | $ | 1,585 |  | $ | 157,500 |  | $ | 1,347,657 |  | $ | 1,479,545 |  | $ | 2,870 |  | $ | 144,278 |  | $ | 1,338,137 |
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):
| March 31, 2024
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 | $ | 14,599 |  | $ | 200 |  | $ | 181,421 |  | $ | 16,927 |  | $ | 196,020 |  | $ | 17,127 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 265 |  | 8,546 |  | 724,601 |  | 129,560 |  | 724,866 |  | 138,106 |
Private label | 1,849 |  | 22 |  | 4,848 |  | 262 |  | 6,697 |  | 284 |
Trust preferred securities | — |  | — |  | 4,449 |  | 151 |  | 4,449 |  | 151 |
Corporate securities | — |  | — |  | 24,551 |  | 1,832 |  | 24,551 |  | 1,832 |
Total available-for-sale | $ | 16,713 |  | $ | 8,768 |  | $ | 939,870 |  | $ | 148,732 |  | $ | 956,583 |  | $ | 157,500 |
| December 31, 2023
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 | $ | 7,591 |  | $ | 66 |  | $ | 180,560 |  | $ | 16,023 |  | $ | 188,151 |  | $ | 16,089 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 2,046 |  | 10,271 |  | 740,911 |  | 115,482 |  | 742,957 |  | 125,753 |
Private label | — |  | — |  | 4,838 |  | 293 |  | 4,838 |  | 293 |
Trust preferred securities | — |  | — |  | 4,278 |  | 321 |  | 4,278 |  | 321 |
Corporate securities | — |  | — |  | 24,609 |  | 1,822 |  | 24,609 |  | 1,822 |
Total available-for-sale | $ | 9,637 |  | $ | 10,337 |  | $ | 955,196 |  | $ | 133,941 |  | $ | 964,833 |  | $ | 144,278 |
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity | The amortized cost and estimated fair value of debt securities at March 31, 2024, 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 | $ | 2,630 |  | $ | 2,598 |
Due after one year through five years | 108,133 |  | 102,535 |
Due after five years through ten years | 406,455 |  | 375,247 |
Due after ten years | 986,354 |  | 867,277 |
Total | $ | 1,503,572 |  | $ | 1,347,657 |
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 March 31, |  |
|  |  | 2024 | 2023 |  |  |
Proceeds on sales of available for sale securities |  |  | $ | — |  | $ | 84,940 |  |  |  |
Gross realized gains on securities sold |  |  | $ | — |  | $ | 975 |  |  |  |
Gross realized losses on securities sold |  |  | (1) |  | (202) |  |  |  |
Net realized investment security gains |  |  | $ | (1) |  | $ | 773 |  |  |  |
Gross unrealized gains recognized on equity securities still held |  |  | $ | 63 |  | $ | 463 |  |  |  |
Gross unrealized losses recognized on equity securities still held |  |  | (215) |  | (102) |  |  |  |
Net unrealized (losses) gains recognized on equity securities still held |  |  | $ | (152) |  | $ | 361 |  |  |  |

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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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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + 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 + Details
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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/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 + Details
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