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Investments (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2023
(dollars in thousands)		Amortized Cost
Allowance for credit losses(1)
Gross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Available-for-sale:
Mortgage-backed securities$419,251 $— $1 $(66,340)$352,912 
Utah Housing Corporation bonds3,460 — — (405)3,055 
U.S. government-sponsored enterprises and Treasuries1,708,890 — — (103,082)1,605,808 
Other securities432,215 — 129 (21,273)411,071 
Total $2,563,816 $— $130 $(191,100)$2,372,846 
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:

(Dollars in thousands)		Less than 12 months12 months or moreTotal
Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value
As of June 30, 2023:
Mortgage-backed securities$(879)$44,532 $(65,461)$308,309 $(66,340)$352,841 
Utah Housing Corporation bonds— — (405)3,055 (405)3,055 
U.S. government-sponsored enterprises and Treasuries(4,419)93,990 (98,663)1,511,818 (103,082)1,605,808 
Other securities(4,121)195,551 (17,152)161,252 (21,273)356,803 
Total$(9,419)$334,073 $(181,681)$1,984,434 $(191,100)$2,318,507 
As of December 31, 2022:
Mortgage-backed securities$(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 June 30, 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 June 30, 2023
Year of Maturity
(dollars in thousands)
Amortized CostEstimated Fair Value
2023$65,001 $64,075 
2024698,726 670,849 
2025298,314 283,644 
2026548,440 493,250 
202798,409 93,990 
203870 71 
2039693 681 
20422,483 2,148 
20434,263 3,830 
20445,357 4,906 
20455,254 4,678 
20467,902 6,965 
20478,311 7,331 
20482,051 1,949 
204916,013 14,251 
2050112,190 90,329 
2051158,214 126,858 
205255,191 48,119 
2053143,586 133,023 
205479,538 72,081 
205594,046 90,092 
2056109,203 109,203 
205850,561 50,523 
Total$2,563,816 $2,372,846