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Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,688,051 | $ 1,831,791
Gross Unrealized Gains | 10 | 20
Gross Unrealized Losses | 220,058 | 236,844
Fair Value | 1,468,003 | 1,594,967
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 190,275 | 190,170
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 22,181 | 22,919
Fair Value | 168,094 | 167,251
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 592,694 | 681,192
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 69,151 | 80,025
Fair Value | 523,543 | 601,167
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 90,330 | 93,599
Gross Unrealized Gains | 1 | 8
Gross Unrealized Losses | 8,284 | 8,326
Fair Value | 82,047 | 85,281
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,852 | 58,727
Gross Unrealized Gains | 9 | 12
Gross Unrealized Losses | 5,919 | 6,071
Fair Value | 48,942 | 52,668
U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 757,400 | 805,603
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 114,265 | 119,381
Fair Value | 643,135 | 686,222
U.S. corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,500 | 2,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 258 | 122
Fair Value | $ 2,242 | $ 2,378

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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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