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Investments (Tables)
 12 Months Ended
Dec. 31, 2022
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, 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 
As of December 31, 2021
(dollars in thousands)		Amortized Cost
Allowance for credit losses(1)
Gross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Available for sale:
Mortgage-backed securities$376,313 $— $1,857 $(7,073)$371,097 
Utah Housing Corporation bonds6,943 — 18 — 6,961 
U.S. government-sponsored enterprises and Treasuries1,958,943 — 603 (11,893)1,947,653 
Other securities193,369 — 439 (1,563)192,245 
Total $2,535,568 $— $2,917 $(20,529)$2,517,956 
 
    
(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
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)$2,338,140 
2021:
Mortgage-backed securities$(5,534)$261,404 $(1,540)$36,587 $(7,074)$297,991 
Utah Housing Corporation bonds— — — — — — 
U.S. government-sponsored enterprises and Treasuries(11,892)1,199,367 — — (11,892)1,199,367 
Other securities(1,563)132,884 — — (1,563)132,884 
Total$(18,989)$1,593,655 $(1,540)$36,587 $(20,529)$1,630,242 
Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturities
As of December 31, 2022, 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, 2022
Year of Maturity
(Dollars in thousands)
Amortized CostEstimated Fair Value
2023$162,526 $159,078 
2024697,970 663,206 
2025297,822 283,197 
2026548,199 489,551 
202798,210 94,277 
203871 73 
2039740 731 
20422,699 2,331 
20434,573 4,096 
20445,464 5,012 
20455,520 4,912 
20468,110 7,151 
20478,470 7,502 
20482,149 2,070 
204916,482 14,645 
2050117,659 94,680 
2051163,803 130,870 
205256,910 49,518 
2053111,518 100,258 
205488,335 79,101 
2055102,497 96,290 
205854,605 53,540 
Total$2,554,332 $2,342,089