XML 58 R35.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Securities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Debt Securities, Available-for-Sale | The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS and HTM debt securities as of December 31, 2023 and 2022:
|  | December 31, 2023
($ in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
AFS debt securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 1,112,587 |  |  | $ | 101 |  |  | $ | (52,313) |  |  | $ | 1,060,375 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 412,086 |  |  | — |  |  | (47,640) |  |  | 364,446 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 531,377 |  |  | 158 |  |  | (63,276) |  |  | 468,259 |
Residential mortgage-backed securities |  | 1,956,927 |  |  | 380 |  |  | (229,713) |  |  | 1,727,594 |
Municipal securities: |  | 297,283 |  |  | 75 |  |  | (36,342) |  |  | 261,016 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 409,578 |  |  | — |  |  | (42,062) |  |  | 367,516 |
Residential mortgage-backed securities |  | 643,335 |  |  | — |  |  | (89,664) |  |  | 553,671 |
Corporate debt securities |  | 653,501 |  |  | — |  |  | (151,076) |  |  | 502,425 |
Foreign government bonds |  | 239,333 |  |  | 69 |  |  | (11,528) |  |  | 227,874 |
Asset-backed securities |  | 43,234 |  |  | — |  |  | (934) |  |  | 42,300 |
CLOs |  | 617,250 |  |  | — |  |  | (4,389) |  |  | 612,861 |
Total AFS debt securities |  | 6,916,491 |  |  | 783 |  |  | (728,937) |  |  | 6,188,337 |
HTM debt securities |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 529,548 |  |  | — |  |  | (40,997) |  |  | 488,551 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 1,001,836 |  |  | — |  |  | (186,904) |  |  | 814,932 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 493,348 |  |  | — |  |  | (88,968) |  |  | 404,380 |
Residential mortgage-backed securities |  | 742,436 |  |  | — |  |  | (142,119) |  |  | 600,317 |
Municipal securities |  | 188,872 |  |  | — |  |  | (43,081) |  |  | 145,791 |
Total HTM debt securities |  | 2,956,040 |  |  | — |  |  | (502,069) |  |  | 2,453,971 |
Total debt securities |  | $ | 9,872,531 |  |  | $ | 783 |  |  | $ | (1,231,006) |  |  | $ | 8,642,308 |
|  | December 31, 2022
($ in thousands) |  | Amortized Cost |  |  |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
AFS debt securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 676,306 |  |  |  |  | $ | — |  |  | $ | (70,103) |  |  | $ | 606,203 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 517,806 |  |  |  |  | 67 |  |  | (56,266) |  |  | 461,607 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 577,392 |  |  |  |  | — |  |  | (77,123) |  |  | 500,269 |
Residential mortgage-backed securities |  | 2,011,054 |  |  |  |  | 41 |  |  | (248,900) |  |  | 1,762,195 |
Municipal securities |  | 303,884 |  |  |  |  | 3 |  |  | (46,788) |  |  | 257,099 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 447,512 |  |  |  |  | 213 |  |  | (49,396) |  |  | 398,329 |
Residential mortgage-backed securities |  | 762,202 |  |  |  |  | — |  |  | (112,978) |  |  | 649,224 |
Corporate debt securities |  | 673,502 |  |  |  |  | — |  |  | (147,228) |  |  | 526,274 |
Foreign government bonds |  | 241,165 |  |  |  |  | 174 |  |  | (14,286) |  |  | 227,053 |
Asset-backed securities |  | 51,152 |  |  |  |  | — |  |  | (2,076) |  |  | 49,076 |
CLOs |  | 617,250 |  |  |  |  | — |  |  | (19,586) |  |  | 597,664 |
Total AFS debt securities |  | 6,879,225 |  |  |  |  | 498 |  |  | (844,730) |  |  | 6,034,993 |
HTM debt securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 524,081 |  |  |  |  | — |  |  | (52,612) |  |  | 471,469 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 998,972 |  |  |  |  | — |  |  | (209,560) |  |  | 789,412 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 506,965 |  |  |  |  | — |  |  | (98,566) |  |  | 408,399 |
Residential mortgage-backed securities |  | 782,141 |  |  |  |  | — |  |  | (148,230) |  |  | 633,911 |
Municipal securities |  | 189,709 |  |  |  |  | — |  |  | (37,729) |  |  | 151,980 |
Total HTM debt securities |  | 3,001,868 |  |  |  |  | — |  |  | (546,697) |  |  | 2,455,171 |
Total debt securities |  | $ | 9,881,093 |  |  |  |  | $ | 498 |  |  | $ | (1,391,427) |  |  | $ | 8,490,164 |
Schedule of Debt Securities, Held-to-Maturity | The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS and HTM debt securities as of December 31, 2023 and 2022:
|  | December 31, 2023
($ in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
AFS debt securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 1,112,587 |  |  | $ | 101 |  |  | $ | (52,313) |  |  | $ | 1,060,375 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 412,086 |  |  | — |  |  | (47,640) |  |  | 364,446 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 531,377 |  |  | 158 |  |  | (63,276) |  |  | 468,259 |
Residential mortgage-backed securities |  | 1,956,927 |  |  | 380 |  |  | (229,713) |  |  | 1,727,594 |
Municipal securities: |  | 297,283 |  |  | 75 |  |  | (36,342) |  |  | 261,016 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 409,578 |  |  | — |  |  | (42,062) |  |  | 367,516 |
Residential mortgage-backed securities |  | 643,335 |  |  | — |  |  | (89,664) |  |  | 553,671 |
Corporate debt securities |  | 653,501 |  |  | — |  |  | (151,076) |  |  | 502,425 |
Foreign government bonds |  | 239,333 |  |  | 69 |  |  | (11,528) |  |  | 227,874 |
Asset-backed securities |  | 43,234 |  |  | — |  |  | (934) |  |  | 42,300 |
CLOs |  | 617,250 |  |  | — |  |  | (4,389) |  |  | 612,861 |
Total AFS debt securities |  | 6,916,491 |  |  | 783 |  |  | (728,937) |  |  | 6,188,337 |
HTM debt securities |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 529,548 |  |  | — |  |  | (40,997) |  |  | 488,551 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 1,001,836 |  |  | — |  |  | (186,904) |  |  | 814,932 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 493,348 |  |  | — |  |  | (88,968) |  |  | 404,380 |
Residential mortgage-backed securities |  | 742,436 |  |  | — |  |  | (142,119) |  |  | 600,317 |
Municipal securities |  | 188,872 |  |  | — |  |  | (43,081) |  |  | 145,791 |
Total HTM debt securities |  | 2,956,040 |  |  | — |  |  | (502,069) |  |  | 2,453,971 |
Total debt securities |  | $ | 9,872,531 |  |  | $ | 783 |  |  | $ | (1,231,006) |  |  | $ | 8,642,308 |
|  | December 31, 2022
($ in thousands) |  | Amortized Cost |  |  |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
AFS debt securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 676,306 |  |  |  |  | $ | — |  |  | $ | (70,103) |  |  | $ | 606,203 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 517,806 |  |  |  |  | 67 |  |  | (56,266) |  |  | 461,607 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 577,392 |  |  |  |  | — |  |  | (77,123) |  |  | 500,269 |
Residential mortgage-backed securities |  | 2,011,054 |  |  |  |  | 41 |  |  | (248,900) |  |  | 1,762,195 |
Municipal securities |  | 303,884 |  |  |  |  | 3 |  |  | (46,788) |  |  | 257,099 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 447,512 |  |  |  |  | 213 |  |  | (49,396) |  |  | 398,329 |
Residential mortgage-backed securities |  | 762,202 |  |  |  |  | — |  |  | (112,978) |  |  | 649,224 |
Corporate debt securities |  | 673,502 |  |  |  |  | — |  |  | (147,228) |  |  | 526,274 |
Foreign government bonds |  | 241,165 |  |  |  |  | 174 |  |  | (14,286) |  |  | 227,053 |
Asset-backed securities |  | 51,152 |  |  |  |  | — |  |  | (2,076) |  |  | 49,076 |
CLOs |  | 617,250 |  |  |  |  | — |  |  | (19,586) |  |  | 597,664 |
Total AFS debt securities |  | 6,879,225 |  |  |  |  | 498 |  |  | (844,730) |  |  | 6,034,993 |
HTM debt securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 524,081 |  |  |  |  | — |  |  | (52,612) |  |  | 471,469 |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 998,972 |  |  |  |  | — |  |  | (209,560) |  |  | 789,412 |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 506,965 |  |  |  |  | — |  |  | (98,566) |  |  | 408,399 |
Residential mortgage-backed securities |  | 782,141 |  |  |  |  | — |  |  | (148,230) |  |  | 633,911 |
Municipal securities |  | 189,709 |  |  |  |  | — |  |  | (37,729) |  |  | 151,980 |
Total HTM debt securities |  | 3,001,868 |  |  |  |  | — |  |  | (546,697) |  |  | 2,455,171 |
Total debt securities |  | $ | 9,881,093 |  |  |  |  | $ | 498 |  |  | $ | (1,391,427) |  |  | $ | 8,490,164 |
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value | The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position, as of December 31, 2023 and 2022:
|  | December 31, 2023
|  | Less Than 12 Months |  | 12 Months or More |  | Total
($ in thousands) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
AFS debt securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | — |  |  | $ | — |  |  | $ | 623,978 |  |  | $ | (52,313) |  |  | $ | 623,978 |  |  | $ | (52,313) |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | — |  |  | — |  |  | 364,446 |  |  | (47,640) |  |  | 364,446 |  |  | (47,640) |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | — |  |  | — |  |  | 463,572 |  |  | (63,276) |  |  | 463,572 |  |  | (63,276) |
Residential mortgage-backed securities |  | 9,402 |  |  | (558) |  |  | 1,661,112 |  |  | (229,155) |  |  | 1,670,514 |  |  | (229,713) |
Municipal securities |  | 2,825 |  |  | (15) |  |  | 254,773 |  |  | (36,327) |  |  | 257,598 |  |  | (36,342) |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 2,742 |  |  | (4) |  |  | 364,774 |  |  | (42,058) |  |  | 367,516 |  |  | (42,062) |
Residential mortgage-backed securities |  | — |  |  | — |  |  | 553,671 |  |  | (89,664) |  |  | 553,671 |  |  | (89,664) |
Corporate debt securities |  | — |  |  | — |  |  | 502,425 |  |  | (151,076) |  |  | 502,425 |  |  | (151,076) |
Foreign government bonds |  | 110,955 |  |  | (144) |  |  | 88,616 |  |  | (11,384) |  |  | 199,571 |  |  | (11,528) |
Asset-backed securities |  | — |  |  | — |  |  | 42,300 |  |  | (934) |  |  | 42,300 |  |  | (934) |
CLOs |  | — |  |  | — |  |  | 612,861 |  |  | (4,389) |  |  | 612,861 |  |  | (4,389) |
Total AFS debt securities |  | $ | 125,924 |  |  | $ | (721) |  |  | $ | 5,532,528 |  |  | $ | (728,216) |  |  | $ | 5,658,452 |  |  | $ | (728,937) |
|  | December 31, 2022
|  | Less Than 12 Months |  | 12 Months or More |  | Total
($ in thousands) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
AFS debt securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 131,843 |  |  | $ | (8,761) |  |  | $ | 474,360 |  |  | $ | (61,342) |  |  | $ | 606,203 |  |  | $ | (70,103) |
U.S. government agency and U.S. government-sponsored enterprise debt securities |  | 97,403 |  |  | (6,902) |  |  | 214,136 |  |  | (49,364) |  |  | 311,539 |  |  | (56,266) |
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 252,144 |  |  | (30,029) |  |  | 248,125 |  |  | (47,094) |  |  | 500,269 |  |  | (77,123) |
Residential mortgage-backed securities |  | 307,536 |  |  | (20,346) |  |  | 1,448,658 |  |  | (228,554) |  |  | 1,756,194 |  |  | (248,900) |
Municipal securities |  | 95,655 |  |  | (10,194) |  |  | 159,439 |  |  | (36,594) |  |  | 255,094 |  |  | (46,788) |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 106,184 |  |  | (3,309) |  |  | 282,301 |  |  | (46,087) |  |  | 388,485 |  |  | (49,396) |
Residential mortgage-backed securities |  | 22,715 |  |  | (1,546) |  |  | 626,509 |  |  | (111,432) |  |  | 649,224 |  |  | (112,978) |
Corporate debt securities |  | 173,595 |  |  | (17,907) |  |  | 352,679 |  |  | (129,321) |  |  | 526,274 |  |  | (147,228) |
Foreign government bonds |  | 107,576 |  |  | (429) |  |  | 36,143 |  |  | (13,857) |  |  | 143,719 |  |  | (14,286) |
Asset-backed securities |  | 12,450 |  |  | (524) |  |  | 36,626 |  |  | (1,552) |  |  | 49,076 |  |  | (2,076) |
CLOs |  | 144,365 |  |  | (4,735) |  |  | 453,299 |  |  | (14,851) |  |  | 597,664 |  |  | (19,586) |
Total AFS debt securities |  | $ | 1,451,466 |  |  | $ | (104,682) |  |  | $ | 4,332,275 |  |  | $ | (740,048) |  |  | $ | 5,783,741 |  |  | $ | (844,730) |
Schedule of the Gross Realized Gains and Tax Expense, Available-for-Sale | The following table presents the gross realized gains from the sales and impairment write-off of AFS debt securities and the related tax (benefit) expense included in earnings for the years ended December 31, 2023, 2022 and 2021:
|  | Year Ended December 31,
($ in thousands) |  | 2023 |  | 2022 |  | 2021
Gross realized gains from sales (1) |  | $ | 3,138 |  |  | $ | 1,306 |  |  | $ | 1,568 |
Impairment write-off (1) |  | $ | (10,000) |  |  | $ | — |  |  | $ | — |
Related tax (benefit) expense |  | $ | (2,029) |  |  | $ | 386 |  |  | $ | 464 |
(1)During 2023, the Company recognized $7 million in net losses on AFS securities as a component of noninterest income in the Company’s Consolidated Statement of Income, consisting of a $10 million impairment write-off on a subordinated debt security, partially offset by a $3 million gain on the sale of the same security.
Schedule of Composition of Interest Income on Debt Securities | The following table presents the composition of interest income on debt securities for the years ended December 31, 2023, 2022 and 2021:
|  | Year Ended December 31, |  |
($ in thousands) |  | 2023 |  | 2022 |  | 2021 |  |  |  |
Taxable interest |  | $ | 255,475 |  |  | $ | 179,720 |  |  | $ | 131,985 |  |  |  |  |
Nontaxable interest |  | 20,715 |  |  | 19,186 |  |  | 11,998 |  |  |  |  |
Total interest income on debt securities |  | $ | 276,190 |  |  | $ | 198,906 |  |  | $ | 143,983 |  |  |  |  |
Schedule of Contractual Maturities of AFS and HTM Debt Securities | The following tables present the contractual maturities, amortized cost, fair value and weighted average yields of AFS and HTM debt securities as of December 31, 2023. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties.
($ in thousands) |  | Within One Year |  | After One Year through Five Years |  | After Five Years through Ten Years |  | After Ten Years |  | Total
AFS debt securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | $ | 436,296 |  |  | $ | 676,291 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,112,587 |
Fair value |  | 436,397 |  |  | 623,978 |  |  | — |  |  | — |  |  | 1,060,375 |
Weighted-average yield (1) |  | 5.40 | % |  | 1.20 | % |  | — | % |  | — | % |  | 2.85 | %
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | 50,000 |  |  | 96,470 |  |  | 128,169 |  |  | 137,447 |  |  | 412,086 |
Fair value |  | 49,882 |  |  | 93,182 |  |  | 109,134 |  |  | 112,248 |  |  | 364,446 |
Weighted-average yield (1) |  | 5.00 | % |  | 3.08 | % |  | 1.38 | % |  | 2.33 | % |  | 2.53 | %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | — |  |  | 41,533 |  |  | 142,008 |  |  | 2,304,763 |  |  | 2,488,304 |
Fair value |  | — |  |  | 39,930 |  |  | 130,528 |  |  | 2,025,395 |  |  | 2,195,853 |
Weighted-average yield (1) (2) |  | — | % |  | 3.13 | % |  | 2.70 | % |  | 3.68 | % |  | 3.62 | %
Municipal securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | 2,240 |  |  | 35,100 |  |  | 9,624 |  |  | 250,319 |  |  | 297,283 |
Fair value |  | 2,214 |  |  | 32,877 |  |  | 8,752 |  |  | 217,173 |  |  | 261,016 |
Weighted-average yield (1) (2) |  | 3.39 | % |  | 2.24 | % |  | 3.22 | % |  | 2.23 | % |  | 2.27 | %
Non-agency mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | 96,990 |  |  | 77,046 |  |  | — |  |  | 878,877 |  |  | 1,052,913 |
Fair value |  | 95,856 |  |  | 74,884 |  |  | — |  |  | 750,447 |  |  | 921,187 |
Weighted-average yield (1) |  | 6.74 | % |  | 4.44 | % |  | — | % |  | 2.59 | % |  | 3.11 | %
Corporate debt securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | — |  |  | — |  |  | 349,501 |  |  | 304,000 |  |  | 653,501 |
Fair value |  | — |  |  | — |  |  | 290,877 |  |  | 211,548 |  |  | 502,425 |
Weighted average yield (1) |  | — | % |  | — | % |  | 3.48 | % |  | 1.97 | % |  | 2.78 | %
Foreign government bonds |  |  |  |  |  |  |  |  |  |
Amortized cost |  | 33,262 |  |  | 106,071 |  |  | 50,000 |  |  | 50,000 |  |  | 239,333 |
Fair value |  | 33,231 |  |  | 106,026 |  |  | 49,593 |  |  | 39,024 |  |  | 227,874 |
Weighted-average yield (1) |  | 3.02 | % |  | 2.28 | % |  | 5.73 | % |  | 1.50 | % |  | 2.94 | %
Asset-backed securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | — |  |  | — |  |  | — |  |  | 43,234 |  |  | 43,234 |
Fair value |  | — |  |  | — |  |  | — |  |  | 42,300 |  |  | 42,300 |
Weighted-average yield (1) |  | — | % |  | — | % |  | — | % |  | 6.07 | % |  | 6.07 | %
CLOs |  |  |  |  |  |  |  |  |  |
Amortized cost |  | — |  |  | — |  |  | 319,000 |  |  | 298,250 |  |  | 617,250 |
Fair value |  | — |  |  | — |  |  | 315,410 |  |  | 297,451 |  |  | 612,861 |
Weighted average yield (1) |  | — | % |  | — | % |  | 6.80 | % |  | 6.82 | % |  | 6.81 | %
Total AFS debt securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | $ | 618,788 |  |  | $ | 1,032,511 |  |  | $ | 998,302 |  |  | $ | 4,266,890 |  |  | $ | 6,916,491 |
Fair value |  | $ | 617,580 |  |  | $ | 970,877 |  |  | $ | 904,294 |  |  | $ | 3,695,586 |  |  | $ | 6,188,337 |
Weighted-average yield (1) |  | 5.44 | % |  | 1.84 | % |  | 4.27 | % |  | 3.42 | % |  | 3.49 | %
($ in thousands) |  | Within One Year |  | After One Year through Five Years |  | After Five Years through Ten Years |  | After Ten Years |  | Total
HTM debt securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | $ | — |  | $ | 529,548 |  | $ | — |  | $ | — |  | $ | 529,548
Fair value |  | — |  | 488,551 |  | — |  | — |  | 488,551
Weighted-average yield (1) |  | — | % |  | 1.05 | % |  | — | % |  | — | % |  | 1.05 | %
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | — |  | — |  | 343,319 |  | 658,517 |  | 1,001,836
Fair value |  | — |  | — |  | 296,124 |  | 518,808 |  | 814,932
Weighted-average yield (1) |  | — | % |  | — | % |  | 1.90 | % |  | 1.89 | % |  | 1.90 | %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | — |  | — |  | 99,473 |  | 1,136,311 |  | 1,235,784
Fair value |  | — |  | — |  | 84,323 |  | 920,374 |  | 1,004,697
Weighted-average yield (1) (2) |  | — | % |  | — | % |  | 1.61 | % |  | 1.70 | % |  | 1.69 | %
Municipal securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | — |  | — |  | — |  | 188,872 |  | 188,872
Fair value |  | — |  | — |  | — |  | 145,791 |  | 145,791
Weighted-average yield (1) (2) |  | — | % |  | — | % |  | — | % |  | 1.99 | % |  | 1.99 | %
Total HTM debt securities |  |  |  |  |  |  |  |  |  |
Amortized cost |  | $ | — |  | $ | 529,548 |  | $ | 442,792 |  | $ | 1,983,700 |  | $ | 2,956,040
Fair value |  | $ | — |  | $ | 488,551 |  | $ | 380,447 |  | $ | 1,584,973 |  | $ | 2,453,971
Weighted-average yield (1) |  | — | % |  | 1.05 | % |  | 1.83 | % |  | 1.79 | % |  | 1.66 | %
(1)Weighted-average yields are computed based on amortized cost balances. (2)Yields on tax-exempt securities are not presented on a tax-equivalent basis.
Schedule of Restricted Equity Securities | The following table presents the restricted equity securities included in Other assets on the Consolidated Balance Sheet as of December 31, 2023 and 2022:
|  | December 31,
($ in thousands) |  | 2023 |  | 2022
FRBSF stock |  | $ | 62,561 |  |  | $ | 61,374 |
FHLB stock |  | 17,250 |  |  | 17,250 |
Total restricted equity securities |  | $ | 79,811 |  |  | $ | 78,624 |

X
- Definition Schedule of Restricted Equity Securities [Table Text Block] + References No definition available. + Details
Name: | ewbc_ScheduleOfRestrictedEquitySecuritiesTableTextBlock
Namespace Prefix: | ewbc_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5B Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5B Reference 16: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5B Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5B Reference 18: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5B + Details
Name: | us-gaap_HeldToMaturitySecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
Name: | us-gaap_InterestIncomeAndInterestExpenseDisclosureTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
Name: | us-gaap_ScheduleOfRealizedGainLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration