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Investments (Tables)
 9 Months Ended
Sep. 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 September 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$438,527 $— $— $(87,399)$351,128 
Utah Housing Corporation bonds3,408 — — (555)2,853 
U.S. government-sponsored enterprises and Treasuries1,669,748 — — (96,757)1,572,991 
Other securities412,951 — 595 (24,540)389,006 
Total $2,524,634 $— $595 $(209,251)$2,315,978 
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 September 30, 2023:
Mortgage-backed securities$(3,342)$67,737 $(84,057)$283,391 $(87,399)$351,128 
Utah Housing Corporation bonds— — (555)2,853 (555)2,853 
U.S. government-sponsored enterprises and Treasuries— — (96,757)1,572,991 (96,757)1,572,991 
Other securities(2,051)81,109 (22,489)236,226 (24,540)317,335 
Total$(5,393)$148,846 $(203,858)$2,095,461 $(209,251)$2,244,307 
As of December 31, 2022:
Mortgage-backed securities$(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 September 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 September 30, 2023
Year of Maturity
(dollars in thousands)
Amortized CostEstimated Fair Value
2023$25,000 $24,767 
2024699,111 677,812 
2025298,564 285,252 
2026548,563 492,182 
202798,511 92,979 
203869 68 
2039663 622 
20422,439 2,008 
20434,209 3,573 
20444,945 4,302 
20455,163 4,337 
20467,841 6,540 
20477,917 6,658 
20482,032 1,790 
204915,899 13,366 
2050109,845 82,601 
2051156,133 116,543 
205254,219 44,328 
2053163,617 150,202 
205475,509 67,142 
205590,148 86,125 
2056105,584 104,292 
205848,653 48,489 
Total$2,524,634 $2,315,978