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Investments - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,440,204 | $ 2,535,568
Allowance for credit losses | 0 | 0
Gross Unrealized Gains | 74 | 2,917
Gross Unrealized Losses | (98,727) | (20,529)
Estimated Fair Value | 2,341,551 | 2,517,956
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 400,647 | 376,313
Allowance for credit losses | 0 | 0
Gross Unrealized Gains | 74 | 1,857
Gross Unrealized Losses | (29,641) | (7,073)
Estimated Fair Value | 371,080 | 371,097
Utah Housing Corporation bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,926 | 6,943
Allowance for credit losses | 0 | 0
Gross Unrealized Gains | 0 | 18
Gross Unrealized Losses | (77) | 0
Estimated Fair Value | 4,849 | 6,961
U.S. government-sponsored enterprises and Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,799,080 | 1,958,943
Allowance for credit losses | 0 | 0
Gross Unrealized Gains | 0 | 603
Gross Unrealized Losses | (63,830) | (11,893)
Estimated Fair Value | 1,735,250 | 1,947,653
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 235,551 | 193,369
Allowance for credit losses | 0 | 0
Gross Unrealized Gains | 0 | 439
Gross Unrealized Losses | (5,179) | (1,563)
Estimated Fair Value | $ 230,372 | $ 192,245

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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