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Investment Securities - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 421,289 | $ 284,770
Gross Unrealized Gains | 1,698 | 11
Gross Unrealized Losses | 18,242 | 24,304
Estimated Fair Value | 404,745 | 260,477
Held-to-maturity |  |
Amortized Cost | 364,029 | 382,447
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | 32,234 | 41,799
Estimated Fair Value | 331,798 | 340,648
Amortized Cost | 785,318 | 667,217
Gross Unrealized Gains | 1,701 | 11
Gross Unrealized Losses | 50,476 | 66,103
Estimated Fair Value | 736,543 | 601,125
U.S. Treasury and U.S. government agencies |  |
Available-for-sale |  |
Amortized Cost | 17,800 | 22,247
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 419 | 740
Estimated Fair Value | 17,381 | 21,507
Held-to-maturity |  |
Amortized Cost | 233,510 | 241,941
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 20,675 | 28,133
Estimated Fair Value | 212,835 | 213,808
Mortgage-backed U.S. government agencies |  |
Available-for-sale |  |
Amortized Cost | 357,124 | 222,464
Gross Unrealized Gains | 1,571 | 11
Gross Unrealized Losses | 14,650 | 19,531
Estimated Fair Value | 344,045 | 202,944
Held-to-maturity |  |
Amortized Cost | 34,908 | 37,593
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 4,383 | 5,508
Estimated Fair Value | 30,526 | 32,085
State and political subdivision obligations |  |
Available-for-sale |  |
Amortized Cost | 4,337 | 4,309
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 670 | 713
Estimated Fair Value | 3,667 | 3,596
Held-to-maturity |  |
Amortized Cost | 73,165 | 77,462
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | 5,859 | 6,840
Estimated Fair Value | 67,308 | 70,622
Corporate debt securities |  |
Available-for-sale |  |
Amortized Cost | 42,028 | 35,750
Gross Unrealized Gains | 127 | 0
Gross Unrealized Losses | 2,503 | 3,320
Estimated Fair Value | 39,652 | 32,430
Held-to-maturity |  |
Amortized Cost | 22,446 | 25,451
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,317 | 1,318
Estimated Fair Value | $ 21,129 | $ 24,133

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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