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Investments (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Securities Available-for-Sale
The amortized cost and fair value of securities available for sale are as follows:
 
As of December 31, 2024
(dollars in thousands)		Amortized Cost
Allowance for credit losses(1)
Gross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Available for sale:
Mortgage-backed securities$516,358 $— $205 $(73,235)$443,328 
Utah Housing Corporation bonds2,849 — — (490)2,359 
U.S. government-sponsored enterprises and Treasuries948,009 — — (32,265)915,744 
Other securities575,257 — 8,633 (12,095)571,795 
Total $2,042,473 $— $8,838 $(118,085)$1,933,226 
As of December 31, 2023
(dollars in thousands)		Amortized Cost
Allowance for credit losses(1)
Gross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Available for sale:
Mortgage-backed securities$468,204 $— $703 $(62,480)$406,427 
Utah Housing Corporation bonds3,408 — — (279)3,129 
U.S. government-sponsored enterprises and Treasuries1,645,609 — — (66,870)1,578,739 
Other securities446,763 — 603 (24,039)423,327 
Total $2,563,984 $— $1,306 $(153,668)$2,411,622 
     
(1) Represents the amount of impairment that has resulted from credit-related factors and that was recognized in the consolidated balance sheets (as a credit loss expense on available-for-sale securities). The amount excludes unrealized losses related to non-credit factors.
Schedule of Available-for-Sale Securities, Continuous Unrealized Loss Position, Fair Value
The following table summarizes the amount of gross unrealized losses for our available-for-sale securities and the estimated fair value for securities having gross unrealized loss positions, categorized by length of time the securities have been in an unrealized loss position:
Less than 12 months12 months or moreTotal
As of December 31,
(dollars in thousands)		Gross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair Value
2024:
Mortgage-backed securities$(2,723)$137,585 $(70,512)$290,257 $(73,235)$427,842 
Utah Housing Corporation bonds— — (490)2,359 (490)2,359 
U.S. government-sponsored enterprises and Treasuries— — (32,265)915,744 (32,265)915,744 
Other securities(74)11,579 (12,021)182,215 (12,095)193,794 
Total$(2,797)$149,164 $(115,288)$1,390,575 $(118,085)$1,539,739 
2023:
Mortgage-backed securities$(531)$51,391 $(61,949)$300,318 $(62,480)$351,709 
Utah Housing Corporation bonds— — (279)3,129 (279)3,129 
U.S. government-sponsored enterprises and Treasuries— — (66,870)1,578,739 (66,870)1,578,739 
Other securities(2,221)90,725 (21,818)241,253 (24,039)331,978 
Total$(2,752)$142,116 $(150,916)$2,123,439 $(153,668)$2,265,555 
Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturities
As of December 31, 2024, the amortized cost and fair value of securities, by contractual maturities, are summarized below. Contractual maturities versus actual maturities may differ due to the effect of prepayments.

As of December 31, 2024
Year of Maturity
(dollars in thousands)
Amortized CostEstimated Fair Value
2025$299,816 $298,648 
2026549,175 520,793 
202799,018 96,303 
203866 66 
2039551 531 
20422,112 1,793 
20433,761 3,299 
20444,085 3,651 
20454,518 3,919 
20466,953 5,965 
20476,704 5,781 
20481,702 1,481 
204914,838 12,842 
2050101,145 78,475 
2051144,694 111,058 
205258,268 50,497 
2053297,695 294,197 
2054142,209 135,800 
205571,611 70,409 
2056194,173 197,363 
205839,379 40,355 
Total$2,042,473 $1,933,226