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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,511,471 | $ 1,548,482
Gross Unrealized Gains | 5,747 | 9,376
Gross Unrealized Losses | 150,863 | 141,208
Fair Value | 1,366,355 | 1,416,650
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 114,611 | 114,418
Gross Unrealized Gains | 161 | 495
Gross Unrealized Losses | 5,244 | 5,009
Fair Value | 109,528 | 109,904
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 462,622 | 472,286
Gross Unrealized Gains | 4,172 | 6,449
Gross Unrealized Losses | 23,595 | 22,277
Fair Value | 443,199 | 456,458
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 89,796 | 89,999
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | 8,762 | 8,077
Fair Value | 81,036 | 81,924
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 47,703 | 49,976
Gross Unrealized Gains | 6 | 8
Gross Unrealized Losses | 5,203 | 4,744
Fair Value | 42,506 | 45,240
U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 794,239 | 819,303
Gross Unrealized Gains | 1,406 | 2,422
Gross Unrealized Losses | 107,898 | 100,895
Fair Value | 687,747 | 720,830
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 | 161 | 206
Fair Value | $ 2,339 | $ 2,294

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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