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Investment Securities - Summary of Available-for-sale Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | $ 1,078,703 | $ 1,229,382
Gross Unrealized Gains |  | 2,307 | 1,583
Gross Unrealized Losses |  | (104,104) | (147,410)
Fair Value | [1] | 976,906 | 1,083,555
U.S. Treasury and government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 17,582 | 15,317
Gross Unrealized Gains |  | 158 | 87
Gross Unrealized Losses |  | (44) | (208)
Fair Value |  | 17,696 | 15,196
U.S. government sponsored agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 171,182 | 224,167
Gross Unrealized Gains |  | 317 | 53
Gross Unrealized Losses |  | (7,367) | (15,137)
Fair Value |  | 164,132 | 209,083
States and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 208,505 | 225,074
Gross Unrealized Gains |  | 139 | 16
Gross Unrealized Losses |  | (21,822) | (28,789)
Fair Value |  | 186,822 | 196,301
Residential mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 627,961 | 693,886
Gross Unrealized Gains |  | 1,692 | 1,391
Gross Unrealized Losses |  | (68,136) | (93,475)
Fair Value |  | 561,517 | 601,802
Commercial mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 48,973 | 64,438
Gross Unrealized Gains |  | 0 | 36
Gross Unrealized Losses |  | (6,463) | (9,409)
Fair Value |  | 42,510 | 55,065
Bank-issued trust preferred securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 4,500 | 6,500
Gross Unrealized Gains |  | 1 | 0
Gross Unrealized Losses |  | (272) | (392)
Fair Value |  | $ 4,229 | $ 6,108
[1] | Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $237, respectively, at both September 30, 2025 and December 31, 2024.

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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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