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Investment Securities - Amortized Cost and Fair Values of Investment Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | $ 377,764 | $ 427,128
Unrealized Gain | 1,000 | 2,485
Unrealized Loss | (33,489) | (49,799)
Investment securities available-for-sale | 345,275 | 379,814
Total debt securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 376,984 | 426,304
Unrealized Gain | 1,000 | 2,485
Unrealized Loss | (33,489) | (49,799)
Investment securities available-for-sale | 344,495 | 378,990
United States government agency securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 44,003 | 51,436
Unrealized Gain | 8 | 15
Unrealized Loss | (5,603) | (6,637)
Investment securities available-for-sale | 38,408 | 44,814
United States sponsored mortgage-backed securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 91,939 | 68,267
Unrealized Gain | 992 | 0
Unrealized Loss | (10,549) | (11,696)
Investment securities available-for-sale | 82,382 | 56,571
United States treasury securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 106,401 | 130,689
Unrealized Gain | 0 | 48
Unrealized Loss | (6,045) | (9,828)
Investment securities available-for-sale | 100,356 | 120,909
Municipal securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 118,065 | 157,842
Unrealized Gain | 0 | 2,412
Unrealized Loss | (11,158) | (21,618)
Investment securities available-for-sale | 106,907 | 138,636
Corporate debt securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 9,076 | 10,570
Unrealized Gain | 0 | 10
Unrealized Loss | (134) | (20)
Investment securities available-for-sale | 8,942 | 10,560
Other debt securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 7,500 | 7,500
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Investment securities available-for-sale | 7,500 | 7,500
Other securities |  |
Amortized cost and fair values of investment securities available-for-sale |  |
Amortized Cost | 780 | 824
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Investment securities available-for-sale | $ 780 | $ 824

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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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