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Securities (Tables) | 12 Months Ended
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Dec. 31, 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 AFS investment securities as of December 31, 2019 and 2018:
($ in thousands) |  | December 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
AFS investment securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 177,215 |  |  | $ | — |  |  | $ | (793 | ) |  | $ | 176,422 |
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 584,275 |  |  | 1,377 |  |  | (4,407 | ) |  | 581,245 |
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 599,814 |  |  | 8,551 |  |  | (4,894 | ) |  | 603,471 |
Residential mortgage-backed securities |  | 998,447 |  |  | 6,927 |  |  | (1,477 | ) |  | 1,003,897 |
Municipal securities |  | 101,621 |  |  | 790 |  |  | (109 | ) |  | 102,302 |
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 86,609 |  |  | 1,947 |  |  | (6 | ) |  | 88,550 |
Residential mortgage-backed securities |  | 46,830 |  |  | 3 |  |  | (285 | ) |  | 46,548 |
Corporate debt securities |  | 11,250 |  |  | 12 |  |  | (113 | ) |  | 11,149 |
Foreign bonds |  | 354,481 |  |  | 198 |  |  | (507 | ) |  | 354,172 |
Asset-backed securities |  | 66,106 |  |  | — |  |  | (1,354 | ) |  | 64,752 |
CLOs |  | 294,000 |  |  | — |  |  | (9,294 | ) |  | 284,706 |
Total AFS investment securities |  | $ | 3,320,648 |  |  | $ | 19,805 |  |  | $ | (23,239 | ) |  | $ | 3,317,214 |
($ in thousands) |  | December 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
AFS 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 AFS investment securities |  | $ | 2,806,900 |  |  | $ | 5,714 |  |  | $ | (70,767 | ) |  | $ | 2,741,847 |
Schedule of fair value and associated gross unrealized loss of available-for-sale investment securities | The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS investment 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, 2019 and 2018:
($ in thousands) |  | December 31, 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
AFS investment securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | — |  |  | $ | — |  |  | $ | 176,422 |  |  | $ | (793 | ) |  | $ | 176,422 |  |  | $ | (793 | )
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 310,349 |  |  | (4,407 | ) |  | — |  |  | — |  |  | 310,349 |  |  | (4,407 | )
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 204,675 |  |  | (2,346 | ) |  | 108,314 |  |  | (2,548 | ) |  | 312,989 |  |  | (4,894 | )
Residential mortgage-backed securities |  | 325,354 |  |  | (1,234 | ) |  | 34,337 |  |  | (243 | ) |  | 359,691 |  |  | (1,477 | )
Municipal securities |  | 31,130 |  |  | (109 | ) |  | — |  |  | — |  |  | 31,130 |  |  | (109 | )
Non-agency mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 7,914 |  |  | (6 | ) |  | — |  |  | — |  |  | 7,914 |  |  | (6 | )
Residential mortgage-backed securities |  | 42,894 |  |  | (285 | ) |  | — |  |  | — |  |  | 42,894 |  |  | (285 | )
Corporate debt securities |  | — |  |  | — |  |  | 9,888 |  |  | (113 | ) |  | 9,888 |  |  | (113 | )
Foreign bonds |  | 129,074 |  |  | (407 | ) |  | 9,900 |  |  | (100 | ) |  | 138,974 |  |  | (507 | )
Asset-backed securities |  | 52,565 |  |  | (902 | ) |  | 12,187 |  |  | (452 | ) |  | 64,752 |  |  | (1,354 | )
CLOs |  | 284,706 |  |  | (9,294 | ) |  | — |  |  | — |  |  | 284,706 |  |  | (9,294 | )
Total AFS investment securities |  | $ | 1,388,661 |  |  | $ | (18,990 | ) |  | $ | 351,048 |  |  | $ | (4,249 | ) |  | $ | 1,739,709 |  |  | $ | (23,239 | )
($ 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
AFS 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 AFS investment securities |  | $ | 163,128 |  |  | $ | (1,518 | ) |  | $ | 2,087,534 |  |  | $ | (69,249 | ) |  | $ | 2,250,662 |  |  | $ | (70,767 | )
Schedule of the proceeds, gross realized gains and losses and tax expense related to the sales of available-for-sale investment securities | The following table presents the proceeds, gross realized gains and losses, and tax expense related to the sales of AFS investment securities for the years ended December 31, 2019, 2018 and 2017:
($ in thousands) |  | Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Proceeds from sales |  | $ | 627,110 |  |  | $ | 364,270 |  |  | $ | 832,844 |
Gross realized gains |  | $ | 3,930 |  |  | $ | 2,535 |  |  | $ | 8,037 |
Related tax expense |  | $ | 1,162 |  |  | $ | 749 |  |  | $ | 3,380 |
Schedule of contractual maturities of available-for-sale investment securities | The following table presents the contractual maturities of AFS investment securities as of December 31, 2019:
($ in thousands) |  | Amortized Cost |  | Fair Value
Due within one year |  | $ | 721,607 |  |  | $ | 719,179 |
Due after one year through five years |  | 395,468 |  |  | 392,891 |
Due after five years through ten years |  | 143,029 |  |  | 145,901 |
Due after ten years |  | 2,060,544 |  |  | 2,059,243 |
Total AFS investment securities |  | $ | 3,320,648 |  |  | $ | 3,317,214 |
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, 2019 and 2018:
($ in thousands) |  | December 31,
| 2019 |  | 2018
FRB stock |  | $ | 58,330 |  |  | $ | 56,819 |
FHLB stock |  | 20,250 |  |  | 17,250 |
Total restricted equity securities |  | $ | 78,580 |  |  | $ | 74,069 |

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