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Investments (Tables)
 12 Months Ended
Dec. 31, 2023
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, 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 
As of December 31, 2022
(dollars in thousands)		Amortized Cost
Allowance for credit losses(1)
Gross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Available for sale:
Mortgage-backed securities$389,067 $— $2 $(68,705)$320,364 
Utah Housing Corporation bonds3,584 — — (357)3,227 
U.S. government-sponsored enterprises and Treasuries1,804,726 — — (115,416)1,689,310 
Other securities356,955 — 33 (27,800)329,188 
Total $2,554,332 $— $35 $(212,278)$2,342,089 
 
    
(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
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)$2,265,555 
2022:
Mortgage-backed securities$(13,956)$99,598 $(54,749)$220,576 $(68,705)$320,174 
Utah Housing Corporation bonds(357)3,227 — — (357)3,227 
U.S. government-sponsored enterprises and Treasuries(28,128)689,300 (87,288)1,000,010 (115,416)1,689,310 
Other securities(15,852)232,546 (11,948)92,883 (27,800)325,429 
Total$(58,293)$1,024,671 $(153,985)$1,313,469 $(212,278)$2,338,140 
Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturities
As of December 31, 2023, 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, 2023
Year of Maturity
(Dollars in thousands)
Amortized CostEstimated Fair Value
2024$699,496 $686,762 
2025298,815 289,794 
2026548,686 506,438 
202798,612 95,746 
203868 69 
2039646 639 
20422,296 2,002 
20434,156 3,773 
20444,837 4,483 
20455,107 4,596 
20467,725 6,897 
20477,646 6,880 
20482,027 1,971 
204915,792 14,170 
2050107,611 87,112 
2051154,622 124,399 
205253,653 46,966 
2053245,209 236,537 
205471,439 63,426 
205586,199 81,892 
2056102,609 100,728 
205846,733 46,342 
Total$2,563,984 $2,411,622