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Securities (Tables)
 9 Months Ended
Sep. 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 September 30, 2022 and December 31, 2021:
($ in thousands)September 30, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
AFS debt securities:
U.S. Treasury securities$676,312 $— $(75,635)$600,677 
U.S. government agency and U.S. government-sponsored enterprise debt securities319,070 — (58,646)260,424 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities595,342 — (73,457)521,885 
Residential mortgage-backed securities2,043,791 58 (250,420)1,793,429 
Municipal securities307,084 — (57,582)249,502 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities448,790 173 (50,988)397,975 
Residential mortgage-backed securities784,700 — (113,162)671,538 
Corporate debt securities673,502 — (143,937)529,565 
Foreign government bonds238,720 528 (13,438)225,810 
Asset-backed securities66,793 — (1,923)64,870 
CLOs617,250 — (26,835)590,415 
Total AFS debt securities6,771,354 759 (866,023)5,906,090 
HTM debt securities:
U.S. Treasury securities522,713 — (56,628)466,085 
U.S. government agency and U.S. government-sponsored enterprise debt securities998,233 — (215,616)782,617 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities509,139 — (92,507)416,632 
Residential mortgage-backed securities792,685 — (142,978)649,707 
Municipal securities189,897 — (45,803)144,094 
Total HTM debt securities3,012,667 — (553,532)2,459,135 
Total debt securities$9,784,021 $759 $(1,419,555)$8,365,225 
($ 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)$9,965,353 
Debt Securities, Held-To-Maturity
The following tables present the amortized cost, gross unrealized gains and losses and fair value by major categories of AFS and HTM debt securities as of September 30, 2022 and December 31, 2021:
($ in thousands)September 30, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
AFS debt securities:
U.S. Treasury securities$676,312 $— $(75,635)$600,677 
U.S. government agency and U.S. government-sponsored enterprise debt securities319,070 — (58,646)260,424 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities595,342 — (73,457)521,885 
Residential mortgage-backed securities2,043,791 58 (250,420)1,793,429 
Municipal securities307,084 — (57,582)249,502 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities448,790 173 (50,988)397,975 
Residential mortgage-backed securities784,700 — (113,162)671,538 
Corporate debt securities673,502 — (143,937)529,565 
Foreign government bonds238,720 528 (13,438)225,810 
Asset-backed securities66,793 — (1,923)64,870 
CLOs617,250 — (26,835)590,415 
Total AFS debt securities6,771,354 759 (866,023)5,906,090 
HTM debt securities:
U.S. Treasury securities522,713 — (56,628)466,085 
U.S. government agency and U.S. government-sponsored enterprise debt securities998,233 — (215,616)782,617 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities509,139 — (92,507)416,632 
Residential mortgage-backed securities792,685 — (142,978)649,707 
Municipal securities189,897 — (45,803)144,094 
Total HTM debt securities3,012,667 — (553,532)2,459,135 
Total debt securities$9,784,021 $759 $(1,419,555)$8,365,225 
($ 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)$9,965,353 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of September 30, 2022 and December 31, 2021.
($ in thousands)September 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$263,772 $(25,232)$336,905 $(50,403)$600,677 $(75,635)
U.S. government agency and U.S. government sponsored enterprise debt securities88,168 (16,401)172,256 (42,245)260,424 (58,646)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities334,460 (39,330)187,425 (34,127)521,885 (73,457)
Residential mortgage-backed securities700,318 (72,088)1,085,253 (178,332)1,785,571 (250,420)
Municipal securities203,157 (46,271)46,345 (11,311)249,502 (57,582)
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities170,101 (8,351)218,124 (42,637)388,225 (50,988)
Residential mortgage-backed securities188,584 (23,168)482,954 (89,994)671,538 (113,162)
Corporate debt securities247,533 (24,969)282,032 (118,968)529,565 (143,937)
Foreign government bonds68,733 (336)36,899 (13,102)105,632 (13,438)
Asset-backed securities54,811 (1,579)10,059 (344)64,870 (1,923)
CLOs190,370 (8,730)400,045 (18,105)590,415 (26,835)
Total AFS debt securities$2,510,007 $(266,455)$3,258,297 $(599,568)$5,768,304 $(866,023)
($ 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 $(172,851)
Schedule Of The Gross Realized Gains And Tax Expense Related To The Sales Of AFS Debt Securities
The following table presents the gross realized gains and tax expense related to the sales of AFS debt securities for the three and nine months ended September 30, 2022 and 2021:
($ in thousands)Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Gross realized gains$— $354 $1,306 $1,178 
Related tax expense$— $104 $386 $348 
Schedule of Composition of Interest Income on Debt Securities
The following table presents the composition of interest income on debt securities for the three and nine months ended September 30, 2022 and 2021:
($ in thousands)Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Taxable interest$46,172 $34,755 $125,626 $92,909 
Nontaxable interest4,920 3,071 14,309 8,707 
Total interest income on debt securities$51,092 $37,826 $139,935 $101,616 
Schedule Of Contractual Maturities And Weighted Average Yields Of AFS And HTM Debt Securities
The following tables present the contractual maturities, amortized cost, fair value and weighted average yields of AFS and HTM debt securities as of September 30, 2022. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties.
($ 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$— $576,605 $99,707 $— $676,312 
Fair value— 516,595 84,082 — 600,677 
Weighted-average yield (1)
— %1.28 %0.74 %— %1.20 %
U.S. government agency and U.S. government-sponsored enterprise debt securities
Amortized cost— 24,775 125,000 169,295 319,070 
Fair value— 22,787 102,540 135,097 260,424 
Weighted-average yield (1)
— %1.47 %1.16 %2.10 %1.69 %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Amortized cost— 24,417 173,899 2,440,817 2,639,133 
Fair value— 23,529 157,827 2,133,958 2,315,314 
Weighted-average yield (1)
— %3.26 %2.71 %2.70 %2.71 %
Municipal securities
Amortized cost1,511 38,079 6,855 260,639 307,084 
Fair value1,510 35,025 5,753 207,214 249,502 
Weighted-average yield (1) (2)
3.13 %2.44 %1.85 %2.24 %2.26 %
Non-agency mortgage-backed securities
Amortized cost28,574 187,564 25,832 991,520 1,233,490 
Fair value28,195 179,900 24,897 836,521 1,069,513 
Weighted-average yield (1)
4.84 %3.87 %0.84 %2.37 %2.62 %
Corporate debt securities
Amortized cost10,000 — 334,502 329,000 673,502 
Fair value9,857 — 296,184 223,524 529,565 
Weighted average yield (1)
3.95 %— %3.59 %1.98 %2.81 %
Foreign government bonds
Amortized cost138,720 — 50,000 50,000 238,720 
Fair value139,060 — 49,851 36,899 225,810 
Weighted-average yield (1)
2.15 %— %2.66 %1.50 %2.12 %
Asset-backed securities
Amortized cost— — — 66,793 66,793 
Fair value— — — 64,870 64,870 
Weighted-average yield (1)
— %— %— %4.15 %4.15 %
CLOs
Amortized cost— — 25,000 592,250 617,250 
Fair value— — 24,168 566,247 590,415 
Weighted average yield (1)
— %— %3.66 %3.86 %3.85 %
Total AFS debt securities
Amortized cost$178,805 $851,440 $840,795 $4,900,314 $6,771,354 
Fair value$178,622 $777,836 $745,302 $4,204,330 $5,906,090 
Weighted-average yield (1)
2.69 %1.96 %2.56 %2.69 %2.58 %
($ 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$—$285,325$237,388$—$522,713
Fair value—255,365210,720—466,085
Weighted-average yield (1)
— %0.96 %1.14 %— %1.05 %
U.S. government agency and U.S. government-sponsored enterprise debt securities
Amortized cost——255,708742,525998,233
Fair value——215,684566,933782,617
Weighted-average yield (1)
— %— %1.94 %1.88 %1.90 %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Amortized cost——96,4331,205,3911,301,824
Fair value——81,526984,8131,066,339
Weighted-average yield (1)
— %— %1.56 %1.63 %1.63 %
Municipal securities
Amortized cost———189,897189,897
Fair value———144,094144,094
Weighted-average yield (1) (2)
— %— %— %1.97 %1.97 %
Total HTM debt securities
Amortized cost$—$285,325$589,529$2,137,813$3,012,667
Fair value$—$255,365$507,930$1,695,840$2,459,135
Weighted-average yield (1)
— %0.96 %1.55 %1.75 %1.64 %
(1)Weighted-average yields are computed based on amortized cost balances.
(2)Yields on tax-exempt securities are not presented on a tax-equivalent basis.
Schedule Of Restricted Equity Securities
The following table presents the restricted equity securities included in Other assets on the Consolidated Balance Sheet as of September 30, 2022 and December 31, 2021:
($ in thousands)September 30, 2022December 31, 2021
Federal Reserve Bank of San Francisco (“FRBSF”) stock$61,004 $60,184 
FHLB stock17,250 17,250 
Total restricted equity securities$78,254 $77,434