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Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | $ 1,211,794 | $ 1,300,719
Gross Unrealized Gains |  | 732 | 1,104
Gross Unrealized Losses |  | (193,945) | (170,424)
Fair Value | [1] | 1,018,581 | 1,131,399
U.S. Treasury and government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 45,207 | 158,473
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (2,741) | (6,051)
Fair Value |  | 42,466 | 152,422
U.S. government sponsored agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 118,148 | 101,753
Gross Unrealized Gains |  | 0 | 18
Gross Unrealized Losses |  | (14,216) | (13,656)
Fair Value |  | 103,932 | 88,115
States and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 263,001 | 261,612
Gross Unrealized Gains |  | 6 | 12
Gross Unrealized Losses |  | (42,547) | (35,742)
Fair Value |  | 220,460 | 225,882
Residential mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 714,501 | 707,025
Gross Unrealized Gains |  | 725 | 1,017
Gross Unrealized Losses |  | (122,122) | (103,389)
Fair Value |  | 593,104 | 604,653
Commercial mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 62,584 | 61,091
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (11,744) | (11,042)
Fair Value |  | 50,840 | 50,049
Bank-issued trust preferred securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Amortized Cost |  | 8,353 | 10,765
Gross Unrealized Gains |  | 1 | 57
Gross Unrealized Losses |  | (575) | (544)
Fair Value |  | $ 7,779 | $ 10,278
[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 September 30, 2023, and $0 and $241, respectively, at December 31, 2022.

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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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