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AVAILABLE-FOR-SALE INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2015
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 securities | The following table presents the amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of available-for-sale investment securities:
($ in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 1,002,874 |  |  | $ | 33 |  |  | $ | (4,392 | ) |  | $ | 998,515 |
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 771,288 |  |  | 555 |  |  | (2,994 | ) |  | 768,849 |
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 354,418 |  |  | 268 |  |  | (3,024 | ) |  | 351,662 |
Residential mortgage-backed securities |  | 996,255 |  |  | 7,542 |  |  | (6,401 | ) |  | 997,396 |
Municipal securities |  | 173,785 |  |  | 2,657 |  |  | (793 | ) |  | 175,649 |
Other residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
Investment grade (1) |  | 62,133 |  |  | 433 |  |  | (173 | ) |  | 62,393 |
Corporate debt securities: |  |  |  |  |  |  |  |  |
Investment grade (1) |  | 366,921 |  |  | 132 |  |  | (2,340 | ) |  | 364,713 |
Non-investment grade (1) |  | 11,491 |  |  | — |  |  | (1,849 | ) |  | 9,642 |
Other securities |  | 44,664 |  |  | 124 |  |  | (381 | ) |  | 44,407 |
Total available-for-sale investment securities |  | $ | 3,783,829 |  |  | $ | 11,744 |  |  | $ | (22,347 | ) |  | $ | 3,773,226 |
As of December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 873,101 |  |  | $ | 1,971 |  |  | $ | (1,637 | ) |  | $ | 873,435 |
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 311,927 |  |  | 490 |  |  | (1,393 | ) |  | 311,024 |
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 140,957 |  |  | 1,056 |  |  | (593 | ) |  | 141,420 |
Residential mortgage-backed securities |  | 785,412 |  |  | 9,754 |  |  | (4,078 | ) |  | 791,088 |
Municipal securities |  | 245,408 |  |  | 6,202 |  |  | (1,162 | ) |  | 250,448 |
Other residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
Investment grade (1) |  | 52,694 |  |  | 1,359 |  |  | (135 | ) |  | 53,918 |
Other commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |
Investment grade (1) |  | 34,000 |  |  | 53 |  |  | — |  |  | 34,053 |
Corporate debt securities: |  |  |  |  |  |  |  |  |
Investment grade (1) |  | 116,236 |  |  | — |  |  | (1,054 | ) |  | 115,182 |
Non-investment grade (1) |  | 17,881 |  |  | — |  |  | (3,200 | ) |  | 14,681 |
Other securities |  | 41,691 |  |  | 393 |  |  | (716 | ) |  | 41,368 |
Total available-for-sale investment securities |  | $ | 2,619,307 |  |  | $ | 21,278 |  |  | $ | (13,968 | ) |  | $ | 2,626,617 |
(1) | Available-for-sale investment securities rated BBB- or higher by S&P or Baa3 or higher by Moody are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody’s are considered non-investment grade.
Gross unrealized losses and related fair values of investment securities available-for-sale | The following table presents the Company’s investment portfolio’s gross unrealized losses and related fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
($ in thousands) |  | Less Than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 907,400 |  |  | $ | (4,250 | ) |  | $ | 20,282 |  |  | $ | (142 | ) |  | $ | 927,682 |  |  | $ | (4,392 | )
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 541,385 |  |  | (2,994 | ) |  | — |  |  | — |  |  | 541,385 |  |  | (2,994 | )
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 252,340 |  |  | (2,562 | ) |  | 20,793 |  |  | (462 | ) |  | 273,133 |  |  | (3,024 | )
Residential mortgage-backed securities |  | 535,842 |  |  | (4,530 | ) |  | 58,315 |  |  | (1,871 | ) |  | 594,157 |  |  | (6,401 | )
Municipal securities |  | 48,495 |  |  | (437 | ) |  | 14,739 |  |  | (356 | ) |  | 63,234 |  |  | (793 | )
Other residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment grade |  | 5,123 |  |  | (1 | ) |  | 6,242 |  |  | (172 | ) |  | 11,365 |  |  | (173 | )
Corporate debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment grade |  | 218,944 |  |  | (1,189 | ) |  | 89,989 |  |  | (1,151 | ) |  | 308,933 |  |  | (2,340 | )
Non-investment grade |  | — |  |  | — |  |  | 9,642 |  |  | (1,849 | ) |  | 9,642 |  |  | (1,849 | )
Other securities |  | 17,990 |  |  | (112 | ) |  | 8,731 |  |  | (269 | ) |  | 26,721 |  |  | (381 | )
Total available-for-sale investment securities |  | $ | 2,527,519 |  |  | $ | (16,075 | ) |  | $ | 228,733 |  |  | $ | (6,272 | ) |  | $ | 2,756,252 |  |  | $ | (22,347 | )
As of December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 170,260 |  |  | $ | (266 | ) |  | $ | 163,800 |  |  | $ | (1,371 | ) |  | $ | 334,060 |  |  | $ | (1,637 | )
U.S. government agency and U.S. government sponsored enterprise debt securities |  | 69,438 |  |  | (504 | ) |  | 124,104 |  |  | (889 | ) |  | 193,542 |  |  | (1,393 | )
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | 45,405 |  |  | (257 | ) |  | 16,169 |  |  | (336 | ) |  | 61,574 |  |  | (593 | )
Residential mortgage-backed securities |  | 81,927 |  |  | (270 | ) |  | 241,047 |  |  | (3,808 | ) |  | 322,974 |  |  | (4,078 | )
Municipal securities |  | 6,391 |  |  | (26 | ) |  | 61,107 |  |  | (1,136 | ) |  | 67,498 |  |  | (1,162 | )
Other residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment grade |  | — |  |  | — |  |  | 7,217 |  |  | (135 | ) |  | 7,217 |  |  | (135 | )
Corporate debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment grade |  | 25,084 |  |  | (12 | ) |  | 90,098 |  |  | (1,042 | ) |  | 115,182 |  |  | (1,054 | )
Non-investment grade |  | — |  |  | — |  |  | 14,681 |  |  | (3,200 | ) |  | 14,681 |  |  | (3,200 | )
Other securities |  | 15,885 |  |  | (716 | ) |  | — |  |  | — |  |  | 15,885 |  |  | (716 | )
Total available-for-sale investment securities |  | $ | 414,390 |  |  | $ | (2,051 | ) |  | $ | 718,223 |  |  | $ | (11,917 | ) |  | $ | 1,132,613 |  |  | $ | (13,968 | )
Schedule of other than temporary impairment, credit losses recognized in earnings | The following table presents a rollforward of the amounts related to the OTTI credit losses recognized in earnings for the years ended December 31:
($ in thousands) |  | 2015 |  | 2014 |  | 2013
Beginning balance |  | $ | 112,338 |  |  | $ | 115,511 |  |  | $ | 115,511 |
Addition of OTTI previously not recognized |  | — |  |  | — |  |  | — |
Additional increase to the amount related to the credit loss for which an OTTI was previously recognized |  | — |  |  | — |  |  | — |
Reduction for securities sold |  | (112,338 | ) |  | (3,173 | ) |  | — |
Ending balance |  | $ | — |  |  | $ | 112,338 |  |  | $ | 115,511 |
Schedule of sales of investment securities | The following table presents the proceeds, gross realized gains and gross realized losses related to the sales of available-for-sale investment securities for the years ended December 31:
($ in thousands) |  | 2015 |  | 2014 |  | 2013
Proceeds from sales |  | $ | 1,669,334 |  |  | $ | 623,689 |  |  | $ | 663,569 |
Gross realized gains |  | $ | 40,367 |  |  | $ | 10,978 |  |  | $ | 13,904 |
Gross realized losses |  | $ | — |  |  | $ | 127 |  | (1) | $ | 1,815 |
Related tax expense |  | $ | 16,954 |  |  | $ | 4,557 |  |  | $ | 5,077 |
(1) | The gross realized losses of $127 thousand resulted from available-for-sale investment securities acquired from MetroCorp which were sold immediately after the acquisition closed.
Scheduled maturities of investment securities | The following table presents the scheduled maturities of available-for-sale investment securities as of December 31, 2015:
($ in thousands) |  | Amortized Cost |  | Estimated Fair Value
Due within one year |  | $ | 756,656 |  |  | $ | 752,736 |
Due after one year through five years |  | 1,155,873 |  |  | 1,152,752 |
Due after five years through ten years |  | 554,458 |  |  | 550,980 |
Due after ten years |  | 1,316,842 |  |  | 1,316,758 |
Total available-for-sale investment securities |  | $ | 3,783,829 |  |  | $ | 3,773,226 |

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