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Investment Securities - Summary of Available-for-sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | $ 1,262,319 | $ 1,184,288
Gross Unrealized Gains |  | 2,169 | 3,240
Gross Unrealized Losses |  | (148,022) | (139,206)
Fair Value | [1] | 1,116,466 | 1,048,322
U.S. Treasury and government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 29,807 | 30,999
Gross Unrealized Gains |  | 113 | 292
Gross Unrealized Losses |  | (1,147) | (995)
Fair Value |  | 28,773 | 30,296
U.S. government sponsored agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 210,871 | 128,500
Gross Unrealized Gains |  | 597 | 639
Gross Unrealized Losses |  | (11,008) | (10,532)
Fair Value |  | 200,460 | 118,607
States and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 237,207 | 239,906
Gross Unrealized Gains |  | 92 | 485
Gross Unrealized Losses |  | (28,549) | (27,095)
Fair Value |  | 208,750 | 213,296
Residential mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 717,657 | 717,772
Gross Unrealized Gains |  | 1,366 | 1,819
Gross Unrealized Losses |  | (97,332) | (90,667)
Fair Value |  | 621,691 | 628,924
Commercial mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 60,277 | 60,611
Gross Unrealized Gains |  | 1 | 5
Gross Unrealized Losses |  | (9,487) | (9,382)
Fair Value |  | 50,791 | 51,234
Bank-issued trust preferred securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 6,500 | 6,500
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (499) | (535)
Fair Value |  | $ 6,001 | $ 5,965
[1] | Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $238, respectively, at March 31, 2024, and $0 and $238, respectively, at December 31, 2023.

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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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