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Investment Securities - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 232,687 | $ 245,886
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 24,751 | 22,331
Estimated Fair Value | 207,936 | 223,555
Held-to-maturity |  |
Amortized Cost | 393,320 | 399,128
Gross Unrealized Gains | 0 | 13
Gross Unrealized Losses | 46,045 | 41,620
Estimated Fair Value | 347,275 | 357,521
Amortized Cost | 626,007 | 645,014
Gross Unrealized Gains | 0 | 13
Gross Unrealized Losses | 70,796 | 63,951
Estimated Fair Value | 555,211 | 581,076
U.S. Treasury and U.S. government agencies |  |
Available-for-sale |  |
Amortized Cost | 31,693 | 36,637
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,074 | 988
Estimated Fair Value | 30,619 | 35,649
Held-to-maturity |  |
Amortized Cost | 245,873 | 245,805
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | 30,436 | 28,676
Estimated Fair Value | 215,437 | 217,131
Mortgage-backed U.S. government agencies |  |
Available-for-sale |  |
Amortized Cost | 160,932 | 169,184
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 18,895 | 16,501
Estimated Fair Value | 142,037 | 152,683
Held-to-maturity |  |
Amortized Cost | 40,845 | 43,818
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 5,776 | 5,523
Estimated Fair Value | 35,069 | 38,295
State and political subdivision obligations |  |
Available-for-sale |  |
Amortized Cost | 4,320 | 4,332
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 729 | 686
Estimated Fair Value | 3,591 | 3,646
Held-to-maturity |  |
Amortized Cost | 81,142 | 84,035
Gross Unrealized Gains | 0 | 11
Gross Unrealized Losses | 7,719 | 6,486
Estimated Fair Value | 73,423 | 77,560
Corporate debt securities |  |
Available-for-sale |  |
Amortized Cost | 35,742 | 35,733
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 4,053 | 4,156
Estimated Fair Value | 31,689 | 31,577
Held-to-maturity |  |
Amortized Cost | 25,460 | 25,470
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,114 | 935
Estimated Fair Value | $ 23,346 | $ 24,535

X
- 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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