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Securities (Tables) | 6 Months Ended
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Jun. 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 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 |
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 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 | )
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 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 |
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 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 |
Schedule of restricted equity securities | 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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