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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities Available-for-Sale: |  |
Amortized Cost | $ 406,797 | $ 455,294
Gross Unrealized Gains | 430 | 58
Gross Unrealized Losses | (37,219) | (47,970)
Fair Value | 370,008 | 407,382
Securities Held-to-Maturity: |  |
Amortized Cost | 440,706 | 449,031
Gross Unrealized Gains | 130 | 356
Gross Unrealized Losses | (34,654) | (43,811)
Fair Value | 406,182 | 405,576
U.S. treasury securities |  |
Securities Available-for-Sale: |  |
Amortized Cost | 1,889 | 500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6) | (2)
Fair Value | 1,883 |
Securities Held-to-Maturity: |  |
Amortized Cost | 94,577 | 93,306
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,846) | (3,212)
Fair Value | 92,731 | 90,094
U.S. agency securities |  |
Securities Available-for-Sale: |  |
Amortized Cost | 4,171 | 4,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (256) | (361)
Fair Value | 3,915 |
Securities Held-to-Maturity: |  |
Amortized Cost | 16,184 | 16,282
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,006) | (1,424)
Fair Value | 15,178 | 14,858
Asset backed securities |  |
Securities Available-for-Sale: |  |
Amortized Cost | 19,851 | 25,035
Gross Unrealized Gains | 15 | 0
Gross Unrealized Losses | (193) | (405)
Fair Value | 19,673 |
State, county & municipal securities |  |
Securities Available-for-Sale: |  |
Amortized Cost | 111,265 | 124,524
Gross Unrealized Gains | 10 | 6
Gross Unrealized Losses | (12,629) | (15,494)
Fair Value | 98,646 |
Securities Held-to-Maturity: |  |
Amortized Cost | 137,066 | 136,685
Gross Unrealized Gains | 130 | 356
Gross Unrealized Losses | (11,286) | (13,859)
Fair Value | 125,910 | 123,182
Corporate debt securities |  |
Securities Available-for-Sale: |  |
Amortized Cost | 53,330 | 53,834
Gross Unrealized Gains | 0 | 16
Gross Unrealized Losses | (5,629) | (6,460)
Fair Value | 47,701 |
Mortgage-backed securities |  |
Securities Available-for-Sale: |  |
Amortized Cost | 216,291 | 246,901
Gross Unrealized Gains | 405 | 36
Gross Unrealized Losses | (18,506) | (25,248)
Fair Value | 198,190 |
Securities Held-to-Maturity: |  |
Amortized Cost | 192,879 | 202,758
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (20,516) | (25,316)
Fair Value | $ 172,363 | $ 177,442

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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/2003/role/disclosureRef -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 + Details
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