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Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
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 June 30, 2022 and December 31, 2021:
($ in thousands)June 30, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
AFS debt securities:
U.S. Treasury securities$676,320 $— $(51,634)$624,686 
U.S. government agency and U.S. government-sponsored enterprise debt securities324,463 — (39,218)285,245 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities614,135 125 (50,428)563,832 
Residential mortgage-backed securities2,097,339 193 (187,292)1,910,240 
Municipal securities306,419 22 (39,708)266,733 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities451,200 247 (39,679)411,768 
Residential mortgage-backed securities808,012 — (81,023)726,989 
Corporate debt securities673,502 105 (114,314)559,293 
Foreign government bonds253,118 648 (10,769)242,997 
Asset-backed securities69,764 — (2,414)67,350 
CLOs617,250 — (20,879)596,371 
Total AFS debt securities6,891,522 1,340 (637,358)6,255,504 
HTM debt securities:
U.S. Treasury securities521,352 — (34,831)486,521 
U.S. government agency and U.S. government-sponsored enterprise debt securities997,369 — (144,291)853,078 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities512,391 — (62,563)449,828 
Residential mortgage-backed securities807,111 — (96,637)710,474 
Municipal securities190,079 — (33,431)156,648 
Total HTM debt securities3,028,302 — (371,753)2,656,549 
Total debt securities$9,919,824 $1,340 $(1,009,111)$8,912,053 
($ in thousands)December 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
AFS debt securities:
U.S. Treasury securities$1,049,238 $130 $(16,687)$1,032,681 
U.S. government agency and U.S. government-sponsored enterprise debt securities1,333,984 2,697 (34,710)1,301,971 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities1,242,043 15,791 (28,854)1,228,980 
Residential mortgage-backed securities2,968,789 8,629 (49,135)2,928,283 
Municipal securities519,381 10,065 (6,288)523,158 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities498,920 3,000 (5,477)496,443 
Residential mortgage-backed securities889,937 971 (8,977)881,931 
Corporate debt securities657,516 8,738 (16,589)649,665 
Foreign government bonds260,447 767 (3,481)257,733 
Asset-backed securities74,674 185 (301)74,558 
CLOs592,250 52 (2,352)589,950 
Total AFS debt securities $10,087,179 $51,025 $(172,851)$9,965,353 
Debt Securities, Held-To-Maturity
The following tables present the amortized cost, gross unrealized gains and losses and fair value by major categories of AFS and HTM debt securities as of June 30, 2022 and December 31, 2021:
($ in thousands)June 30, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
AFS debt securities:
U.S. Treasury securities$676,320 $— $(51,634)$624,686 
U.S. government agency and U.S. government-sponsored enterprise debt securities324,463 — (39,218)285,245 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities614,135 125 (50,428)563,832 
Residential mortgage-backed securities2,097,339 193 (187,292)1,910,240 
Municipal securities306,419 22 (39,708)266,733 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities451,200 247 (39,679)411,768 
Residential mortgage-backed securities808,012 — (81,023)726,989 
Corporate debt securities673,502 105 (114,314)559,293 
Foreign government bonds253,118 648 (10,769)242,997 
Asset-backed securities69,764 — (2,414)67,350 
CLOs617,250 — (20,879)596,371 
Total AFS debt securities6,891,522 1,340 (637,358)6,255,504 
HTM debt securities:
U.S. Treasury securities521,352 — (34,831)486,521 
U.S. government agency and U.S. government-sponsored enterprise debt securities997,369 — (144,291)853,078 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities512,391 — (62,563)449,828 
Residential mortgage-backed securities807,111 — (96,637)710,474 
Municipal securities190,079 — (33,431)156,648 
Total HTM debt securities3,028,302 — (371,753)2,656,549 
Total debt securities$9,919,824 $1,340 $(1,009,111)$8,912,053 
($ in thousands)December 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
AFS debt securities:
U.S. Treasury securities$1,049,238 $130 $(16,687)$1,032,681 
U.S. government agency and U.S. government-sponsored enterprise debt securities1,333,984 2,697 (34,710)1,301,971 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities1,242,043 15,791 (28,854)1,228,980 
Residential mortgage-backed securities2,968,789 8,629 (49,135)2,928,283 
Municipal securities519,381 10,065 (6,288)523,158 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities498,920 3,000 (5,477)496,443 
Residential mortgage-backed securities889,937 971 (8,977)881,931 
Corporate debt securities657,516 8,738 (16,589)649,665 
Foreign government bonds260,447 767 (3,481)257,733 
Asset-backed securities74,674 185 (301)74,558 
CLOs592,250 52 (2,352)589,950 
Total AFS debt securities $10,087,179 $51,025 $(172,851)$9,965,353 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of June 30, 2022 and December 31, 2021.
($ in thousands)June 30, 2022
Less Than 12 Months12 Months or MoreTotal
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
AFS debt securities:
U.S. Treasury securities$466,095 $(32,524)$158,591 $(19,110)$624,686 $(51,634)
U.S. government agency and U.S. government sponsored enterprise debt securities249,274 (35,689)35,971 (3,529)285,245 (39,218)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities440,235 (34,101)110,670 (16,327)550,905 (50,428)
Residential mortgage-backed securities1,433,558 (122,567)463,552 (64,725)1,897,110 (187,292)
Municipal securities265,197 (39,708)— — 265,197 (39,708)
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities335,199 (28,436)65,175 (11,243)400,374 (39,679)
Residential mortgage-backed securities616,819 (67,098)110,170 (13,925)726,989 (81,023)
Corporate debt securities295,000 (35,503)236,189 (78,811)531,189 (114,314)
Foreign government bonds18,887 (165)67,798 (10,604)86,685 (10,769)
Asset-backed securities57,469 (1,888)9,881 (526)67,350 (2,414)
CLOs312,368 (10,882)284,003 (9,997)596,371 (20,879)
Total AFS debt securities$4,490,101 $(408,561)$1,542,000 $(228,797)$6,032,101 $(637,358)
($ in thousands)December 31, 2021
Less Than 12 Months12 Months or MoreTotal
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
AFS debt securities:
U.S. Treasury securities$935,776 $(14,689)$47,881 $(1,998)$983,657 $(16,687)
U.S. government agency and U.S. government-sponsored enterprise debt securities773,647 (18,000)402,907 (16,710)1,176,554 (34,710)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities440,734 (13,589)257,745 (15,265)698,479 (28,854)
Residential mortgage-backed securities2,138,542 (37,691)330,522 (11,444)2,469,064 (49,135)
Municipal securities177,065 (5,682)17,003 (606)194,068 (6,288)
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities301,925 (4,158)40,013 (1,319)341,938 (5,477)
Residential mortgage-backed securities707,792 (8,966)6,431 (11)714,223 (8,977)
Corporate debt securities183,916 (3,084)251,494 (13,505)435,410 (16,589)
Foreign government bonds27,097 (5)133,279 (3,476)160,376 (3,481)
Asset-backed securities24,885 (301)— — 24,885 (301)
CLOs221,586 (64)291,712 (2,288)513,298 (2,352)
Total AFS debt securities$5,932,965 $(106,229)$1,778,987 $(66,622)$7,711,952 $(172,851)
Schedule Of The Gross Realized Gains And Tax Expense Related To The Sales Of AFS Debt Securities
The following table presents the gross realized gains and tax expense related to the sales of AFS debt securities for the three and six months ended June 30, 2022 and 2021:
($ in thousands)Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Gross realized gains$28 $632 $1,306 $824 
Related tax expense$8 $187 $386 $244 
Schedule Of Contractual Maturities And Weighted Average Yields Of AFS And HTM Debt Securities
The following tables present the contractual maturities, amortized cost, fair value and weighted average yields of AFS and HTM debt securities as of June 30, 2022. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties.
($ 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$— $576,626 $99,694 $— $676,320 
Fair value— 536,698 87,988 — 624,686 
Weighted-average yield (1)
— %1.28 %0.74 %— %1.20 %
U.S. government agency and U.S. government-sponsored enterprise debt securities
Amortized cost— 29,193 125,001 170,269 324,463 
Fair value— 27,700 110,199 147,346 285,245 
Weighted-average yield (1)
— %1.62 %1.16 %2.09 %1.69 %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Amortized cost— 13,289 192,287 2,505,898 2,711,474 
Fair value— 13,205 182,832 2,278,035 2,474,072 
Weighted-average yield (1)
— %3.11 %2.69 %2.11 %2.15 %
Municipal securities
Amortized cost— 39,712 6,498 260,209 306,419 
Fair value— 37,800 5,758 223,175 266,733 
Weighted-average yield (1) (2)
— %2.47 %1.79 %2.23 %2.25 %
Non-agency mortgage-backed securities
Amortized cost10,019 196,136 40,404 1,012,653 1,259,212 
Fair value9,894 189,963 39,224 899,676 1,138,757 
Weighted-average yield (1)
4.47 %3.56 %1.19 %2.23 %2.42 %
Corporate debt securities
Amortized cost10,000 — 334,502 329,000 673,502 
Fair value9,847 — 309,395 240,051 559,293 
Weighted average yield (1)
3.26 %— %3.59 %1.98 %2.80 %
Foreign government bonds
Amortized cost108,712 44,406 50,000 50,000 253,118 
Fair value108,660 44,832 50,081 39,424 242,997 
Weighted-average yield (1)
1.82 %3.01 %0.55 %1.50 %1.71 %
Asset-backed securities:
Amortized cost— — — 69,764 69,764 
Fair value— — — 67,350 67,350 
Weighted-average yield (1)
— %— %— %2.74 %2.74 %
CLOs
Amortized cost— — — 617,250 617,250 
Fair value— — — 596,371 596,371 
Weighted average yield (1)
— %— %— %2.22 %2.22 %
Total AFS debt securities
Amortized cost$128,731 $899,362 $848,386 $5,015,043 $6,891,522 
Fair value$128,401 $850,198 $785,477 $4,491,428 $6,255,504 
Weighted-average yield (1)
2.14 %1.95 %2.39 %2.15 %2.15 %
($ in thousands)Within One Year
After One Year through Five Years
After Five Years through Ten YearsAfter Ten YearsTotal
HTM debt securities:
U.S. Treasury securities
Amortized cost$—$166,856$354,496$—$521,352
Fair value—156,200330,321—486,521
Weighted-average yield (1)
— %0.90 %1.12 %— %1.05 %
U.S. government agency and U.S. government-sponsored enterprise debt securities
Amortized cost——213,101784,268997,369
Fair value——193,357659,721853,078
Weighted-average yield (1)
— %— %2.03 %1.86 %1.90 %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Amortized cost——87,2641,232,2381,319,502
Fair value——78,9931,081,3091,160,302
Weighted-average yield (1)
— %— %1.60 %1.59 %1.59 %
Municipal securities
Amortized cost———190,079190,079
Fair value———156,648156,648
Weighted-average yield (1) (2)
— %— %— %1.97 %1.97 %
Total HTM debt securities
Amortized cost$—$166,856$654,861$2,206,585$3,028,302
Fair value$—$156,200$602,671$1,897,678$2,656,549
Weighted-average yield (1)
— %0.90 %1.48 %1.72 %1.62 %
(1)Weighted-average yields are computed based on amortized cost balances.
(2)Yields on tax-exempt securities are not presented on a tax-equivalent basis.
Schedule Of Restricted Equity Securities
The following table presents the restricted equity securities included in Other assets on the Consolidated Balance Sheet as of June 30, 2022 and December 31, 2021:
($ in thousands)June 30, 2022December 31, 2021
Federal Reserve Bank of San Francisco (“FRBSF”) stock$60,712 $60,184 
FHLB stock17,250 17,250 
Total restricted equity securities$77,962 $77,434