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Securities | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Securities | Securities The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of available-for-sale investment securities as of June 30, 2019 and December 31, 2018:
($ in thousands) |  | June 30, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale investment securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 329,209 |  |  | $ | — |  |  | $ | (2,674 | ) |  | $ | 326,535 |
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 239,732 |  |  | 2,252 |  |  | (17 | ) |  | 241,967 |
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 471,189 |  |  | 7,956 |  |  | (4,313 | ) |  | 474,832 |
Residential mortgage-backed securities |  | 836,757 |  |  | 8,222 |  |  | (1,405 | ) |  | 843,574 |
Municipal securities |  | 86,776 |  |  | 791 |  |  | (38 | ) |  | 87,529 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 68,675 |  |  | 1,878 |  |  | (4 | ) |  | 70,549 |
Residential mortgage-backed securities |  | 24,534 |  |  | 19 |  |  | (14 | ) |  | 24,539 |
Corporate debt securities |  | 11,250 |  |  | — |  |  | (94 | ) |  | 11,156 |
Foreign bonds |  | 489,392 |  |  | 111 |  |  | (5,087 | ) |  | 484,416 |
Asset-backed securities |  | 27,991 |  |  | — |  |  | (175 | ) |  | 27,816 |
Total available-for-sale investment securities |  | $ | 2,585,505 |  |  | $ | 21,229 |  |  | $ | (13,821 | ) |  | $ | 2,592,913 |
($ in thousands) |  | December 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale investment securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 577,561 |  |  | $ | 153 |  |  | $ | (12,899 | ) |  | $ | 564,815 |
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 219,485 |  |  | 382 |  |  | (2,694 | ) |  | 217,173 |
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 420,486 |  |  | 811 |  |  | (12,694 | ) |  | 408,603 |
Residential mortgage-backed securities |  | 957,219 |  |  | 4,026 |  |  | (14,552 | ) |  | 946,693 |
Municipal securities |  | 82,965 |  |  | 87 |  |  | (1,032 | ) |  | 82,020 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 25,826 |  |  | 226 |  |  | — |  |  | 26,052 |
Residential mortgage-backed securities |  | 10,109 |  |  | 7 |  |  | (185 | ) |  | 9,931 |
Corporate debt securities |  | 11,250 |  |  | — |  |  | (381 | ) |  | 10,869 |
Foreign bonds |  | 489,378 |  |  | — |  |  | (26,330 | ) |  | 463,048 |
Asset-backed securities |  | 12,621 |  |  | 22 |  |  | — |  |  | 12,643 |
Total available-for-sale investment securities |  | $ | 2,806,900 |  |  | $ | 5,714 |  |  | $ | (70,767 | ) |  | $ | 2,741,847 |
Unrealized Losses The following tables present the fair value and the associated gross unrealized losses of the Company’s available-for-sale investment 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, 2019 and December 31, 2018:
($ in thousands) |  | June 30, 2019
| Less Than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Available-for-sale investment securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | — |  |  | $ | — |  |  | $ | 326,535 |  |  | $ | (2,674 | ) |  | $ | 326,535 |  |  | $ | (2,674 | )
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 22,442 |  |  | (17 | ) |  | — |  |  | — |  |  | 22,442 |  |  | (17 | )
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 10,210 |  |  | (81 | ) |  | 208,330 |  |  | (4,232 | ) |  | 218,540 |  |  | (4,313 | )
Residential mortgage-backed securities |  | 11,679 |  |  | (123 | ) |  | 145,595 |  |  | (1,282 | ) |  | 157,274 |  |  | (1,405 | )
Municipal securities |  | 4,890 |  |  | (10 | ) |  | 9,950 |  |  | (28 | ) |  | 14,840 |  |  | (38 | )
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 7,916 |  |  | (4 | ) |  | — |  |  | — |  |  | 7,916 |  |  | (4 | )
Residential mortgage-backed securities |  | — |  |  | — |  |  | 3,917 |  |  | (14 | ) |  | 3,917 |  |  | (14 | )
Corporate debt securities |  | 1,244 |  |  | (6 | ) |  | 9,912 |  |  | (88 | ) |  | 11,156 |  |  | (94 | )
Foreign bonds |  | 14,349 |  |  | (94 | ) |  | 369,956 |  |  | (4,993 | ) |  | 384,305 |  |  | (5,087 | )
Asset-backed securities |  | 27,816 |  |  | (175 | ) |  | — |  |  | — |  |  | 27,816 |  |  | (175 | )
Total available-for-sale investment securities |  | $ | 100,546 |  |  | $ | (510 | ) |  | $ | 1,074,195 |  |  | $ | (13,311 | ) |  | $ | 1,174,741 |  |  | $ | (13,821 | )
($ in thousands) |  | December 31, 2018
| Less Than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Available-for-sale investment securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | — |  |  | $ | — |  |  | $ | 516,520 |  |  | $ | (12,899 | ) |  | $ | 516,520 |  |  | $ | (12,899 | )
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 22,755 |  |  | (238 | ) |  | 159,814 |  |  | (2,456 | ) |  | 182,569 |  |  | (2,694 | )
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 26,886 |  |  | (245 | ) |  | 274,666 |  |  | (12,449 | ) |  | 301,552 |  |  | (12,694 | )
Residential mortgage-backed securities |  | 75,675 |  |  | (491 | ) |  | 653,660 |  |  | (14,061 | ) |  | 729,335 |  |  | (14,552 | )
Municipal securities |  | 9,458 |  |  | (104 | ) |  | 30,295 |  |  | (928 | ) |  | 39,753 |  |  | (1,032 | )
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities |  | 3,067 |  |  | (19 | ) |  | 3,949 |  |  | (166 | ) |  | 7,016 |  |  | (185 | )
Corporate debt securities |  | 10,869 |  |  | (381 | ) |  | — |  |  | — |  |  | 10,869 |  |  | (381 | )
Foreign bonds |  | 14,418 |  |  | (40 | ) |  | 448,630 |  |  | (26,290 | ) |  | 463,048 |  |  | (26,330 | )
Total available-for-sale investment securities |  | $ | 163,128 |  |  | $ | (1,518 | ) |  | $ | 2,087,534 |  |  | $ | (69,249 | ) |  | $ | 2,250,662 |  |  | $ | (70,767 | )
Other-Than-Temporary Impairment For each reporting period, the Company assesses individual securities that are in an unrealized loss position for OTTI. For a discussion of the factors and criteria the Company uses in analyzing securities for OTTI, see Note 1 — Summary of Significant Accounting Policies — Securities to the Consolidated Financial Statements of the Company’s 2018 Form 10-K. The unrealized losses were primarily attributable to the movement in the yield curve, in addition to widened liquidity and credit spreads. The issuers of these securities have not, to the Company’s knowledge, established any cause for default on these securities. These securities have fluctuated in value since their purchase dates because of changes in market interest rates. The Company believes that the gross unrealized losses presented in the previous tables are temporary and no credit losses are expected. As a result, the Company expects to recover the entire amortized cost basis of these securities. The Company has the intent to hold these securities through the anticipated recovery period and it is not more-likely-than-not that the Company will have to sell these securities before recovery of their amortized cost. As of June 30, 2019, the Company had 76 available-for-sale investment securities in a gross unrealized loss position with no credit impairment, primarily consisting of 40 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, 11 foreign bonds, and 12 U.S. Treasury securities. In comparison, as of December 31, 2018, the Company had 184 available-for-sale investment securities in a gross unrealized loss position with no credit impairment, primarily consisting of 108 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, 16 foreign bonds, and 19 U.S. Treasury securities. There were no OTTI credit losses recognized in earnings for each of the three and six months ended June 30, 2019 and 2018. Realized Gains and Losses The following table presents the proceeds, gross realized gains and tax expense related to the sales of available-for-sale investment securities for the three and six months ended June 30, 2019 and 2018:
($ in thousands) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Proceeds from sales |  | $ | 223,763 |  |  | $ | 42,085 |  |  | $ | 375,102 |  |  | $ | 256,875 |
Gross realized gains |  | $ | 1,447 |  |  | $ | 210 |  |  | $ | 3,008 |  |  | $ | 2,339 |
Related tax expense |  | $ | 428 |  |  | $ | 62 |  |  | $ | 889 |  |  | $ | 690 |
Contractual Maturities of Investment Securities The following table presents the contractual maturities of available-for-sale investment securities as of June 30, 2019:
($ in thousands) |  | Amortized Cost |  | Fair Value
Due within one year |  | $ | 586,072 |  |  | $ | 581,305 |
Due after one year through five years |  | 432,912 |  |  | 430,486 |
Due after five years through ten years |  | 193,117 |  |  | 196,457 |
Due after ten years |  | 1,373,404 |  |  | 1,384,665 |
Total available-for-sale investment securities |  | $ | 2,585,505 |  |  | $ | 2,592,913 |
Actual maturities of mortgage-backed securities can differ from contractual maturities as the borrowers have the right to prepay obligations. In addition, factors such as prepayments and interest rates may affect the yields on the carrying values of mortgage-backed securities. As of June 30, 2019 and December 31, 2018, available-for-sale investment securities with fair value of $493.7 million and $435.8 million, respectively, were pledged to secure public deposits, interest rate contracts, repurchase agreements and for other purposes required or permitted by law. Restricted Equity Securities Restricted equity securities include the Federal Reserve Bank of San Francisco (“FRB”) and the FHLB stock. Restricted equity securities are carried at cost as these securities do not have a readily determinable fair value. The following table presents the restricted equity securities as of June 30, 2019 and December 31, 2018:
($ in thousands) |  | June 30, 2019 |  | December 31, 2018
FRB stock |  | $ | 57,843 |  |  | $ | 56,819 |
FHLB stock |  | 20,250 |  |  | 17,250 |
Total restricted equity securities |  | $ | 78,093 |  |  | $ | 74,069 |

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