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Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of available-for-sale investment 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 September 30, 2019 and December 31, 2018:
($ in thousands) |  | September 30, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale investment securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 427,535 |  |  | $ | — |  |  | $ | (1,422 | ) |  | $ | 426,113 |
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 688,529 |  |  | 2,924 |  |  | (85 | ) |  | 691,368 |
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 539,957 |  |  | 12,500 |  |  | (2,664 | ) |  | 549,793 |
Residential mortgage-backed securities |  | 914,379 |  |  | 11,914 |  |  | (906 | ) |  | 925,387 |
Municipal securities |  | 76,948 |  |  | 1,218 |  |  | (7 | ) |  | 78,159 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 67,518 |  |  | 2,731 |  |  | (6 | ) |  | 70,243 |
Residential mortgage-backed securities |  | 31,209 |  |  | 425 |  |  | (139 | ) |  | 31,495 |
Corporate debt securities |  | 11,250 |  |  | — |  |  | (228 | ) |  | 11,022 |
Foreign bonds |  | 454,431 |  |  | 607 |  |  | (1,859 | ) |  | 453,179 |
Asset-backed securities |  | 48,028 |  |  | — |  |  | (753 | ) |  | 47,275 |
Total available-for-sale investment securities |  | $ | 3,259,784 |  |  | $ | 32,319 |  |  | $ | (8,069 | ) |  | $ | 3,284,034 |
($ 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 |
Schedule of fair value and associated gross unrealized losses of available-for-sale investment securities | 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 September 30, 2019 and December 31, 2018:
($ in thousands) |  | September 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 |  | $ | 199,711 |  |  | $ | (76 | ) |  | $ | 226,402 |  |  | $ | (1,346 | ) |  | $ | 426,113 |  |  | $ | (1,422 | )
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 354,916 |  |  | (85 | ) |  | — |  |  | — |  |  | 354,916 |  |  | (85 | )
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 60,336 |  |  | (573 | ) |  | 116,139 |  |  | (2,091 | ) |  | 176,475 |  |  | (2,664 | )
Residential mortgage-backed securities |  | 87,356 |  |  | (553 | ) |  | 43,403 |  |  | (353 | ) |  | 130,759 |  |  | (906 | )
Municipal securities |  | 979 |  |  | (1 | ) |  | 5,046 |  |  | (6 | ) |  | 6,025 |  |  | (7 | )
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 7,914 |  |  | (6 | ) |  | — |  |  | — |  |  | 7,914 |  |  | (6 | )
Residential mortgage-backed securities |  | 11,145 |  |  | (139 | ) |  | — |  |  | — |  |  | 11,145 |  |  | (139 | )
Corporate debt securities |  | 1,247 |  |  | (3 | ) |  | 9,775 |  |  | (225 | ) |  | 11,022 |  |  | (228 | )
Foreign bonds |  | 14,338 |  |  | (101 | ) |  | 123,243 |  |  | (1,758 | ) |  | 137,581 |  |  | (1,859 | )
Asset-backed securities |  | 47,275 |  |  | (753 | ) |  | — |  |  | — |  |  | 47,275 |  |  | (753 | )
Total available-for-sale investment securities |  | $ | 785,217 |  |  | $ | (2,290 | ) |  | $ | 524,008 |  |  | $ | (5,779 | ) |  | $ | 1,309,225 |  |  | $ | (8,069 | )
($ 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 | )
Schedule of the proceeds, gross realized gains, and tax expense related to the sales of available-for-sale investment securities | 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 nine months ended September 30, 2019 and 2018:
($ in thousands) |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Proceeds from sales |  | $ | 101,129 |  |  | $ | 39,377 |  |  | $ | 476,231 |  |  | $ | 296,252 |
Gross realized gains |  | $ | 58 |  |  | $ | 35 |  |  | $ | 3,066 |  |  | $ | 2,374 |
Related tax expense |  | $ | 17 |  |  | $ | 11 |  |  | $ | 906 |  |  | $ | 701 |
Schedule of contractual maturities of available-for-sale investment securities | The following table presents the contractual maturities of available-for-sale investment securities as of September 30, 2019:
($ in thousands) |  | Amortized Cost |  | Fair Value
Due within one year |  | $ | 1,100,414 |  |  | $ | 1,099,412 |
Due after one year through five years |  | 430,577 |  |  | 429,725 |
Due after five years through ten years |  | 185,633 |  |  | 189,981 |
Due after ten years |  | 1,543,160 |  |  | 1,564,916 |
Total available-for-sale investment securities |  | $ | 3,259,784 |  |  | $ | 3,284,034 |
Schedule of restricted equity securities | The following table presents the restricted equity securities as of September 30, 2019 and December 31, 2018:
($ in thousands) |  | September 30, 2019 |  | December 31, 2018
FRB stock |  | $ | 58,084 |  |  | $ | 56,819 |
FHLB stock |  | 20,250 |  |  | 17,250 |
Total restricted equity securities |  | $ | 78,334 |  |  | $ | 74,069 |

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