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Investment Securities - Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 360,983 | $ 427,128
Unrealized Gain | 1,072 | 2,485
Unrealized Loss | (50,518) | (49,799)
Fair Value | 311,537 | 379,814
United States government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 44,360 | 51,436
Unrealized Gain | 8 | 15
Unrealized Loss | (7,228) | (6,637)
Fair Value | 37,140 | 44,814
United States sponsored mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 73,911 | 68,267
Unrealized Gain | 0 | 0
Unrealized Loss | (13,430) | (11,696)
Fair Value | 60,481 | 56,571
United States treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 106,476 | 130,689
Unrealized Gain | 0 | 48
Unrealized Loss | (8,376) | (9,828)
Fair Value | 98,100 | 120,909
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 118,872 | 157,842
Unrealized Gain | 1,064 | 2,412
Unrealized Loss | (21,312) | (21,618)
Fair Value | 98,624 | 138,636
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,073 | 10,570
Unrealized Gain | 0 | 10
Unrealized Loss | (172) | (20)
Fair Value | 8,901 | 10,560
Other debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,500 | 7,500
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 7,500 | 7,500
Total debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 360,192 | 426,304
Unrealized Gain | 1,072 | 2,485
Unrealized Loss | (50,518) | (49,799)
Fair Value | 310,746 | 378,990
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 791 | 824
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | $ 791 | $ 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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