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Deposits (Tables) | 12 Months Ended
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Dec. 31, 2014
Deposits [Abstract] |
Deposits summary | At December 31, 2014 and 2013, deposits consisted of the following ($ in thousands):
|  | 2014 |  |  | 2013 |
Noninterest-bearing demand |  | $ | 2,748,635 |  |  | $ | 2,663,503 |
Interest-bearing demand |  |  | 1,722,581 |  |  |  | 1,923,701 |
Savings |  |  | 3,280,060 |  |  |  | 2,997,294 |
Time |  |  | 1,947,082 |  |  |  | 2,275,404 |
Total |  | $ | 9,698,358 |  |  | $ | 9,859,902 |
Interest expense on deposits by type | Interest expense on deposits by type consisted of the following for the years ended December 31, 2014, 2013 and 2012 ($ in thousands):
|  | 2014 |  |  | 2013 |  |  | 2012 |
Interest-bearing demand |  | $ | 3,151 |  |  | $ | 3,948 |  |  | $ | 3,975 |
Savings |  |  | 2,949 |  |  |  | 3,889 |  |  |  | 6,004 |
Time |  |  | 9,223 |  |  |  | 11,881 |  |  |  | 14,625 |
Total |  | $ | 15,323 |  |  | $ | 19,718 |  |  | $ | 24,604 |
Maturities on outstanding time deposits of $100,000 or more | The maturities on outstanding time deposits of $100,000 or more at December 31, 2014 and 2013 are as follows ($ in thousands):
|  | 2014 |  |  | 2013 |
3 months or less |  | $ | 199,087 |  |  | $ | 242,757 |
Over 3 months through 6 months |  |  | 168,886 |  |  |  | 208,863 |
Over 6 months through 12 months |  |  | 227,130 |  |  |  | 312,189 |
Over 12 months |  |  | 222,119 |  |  |  | 208,208 |
Total |  | $ | 817,222 |  |  | $ | 972,017 |
Maturities of interest-bearing deposits | The maturities of interest-bearing deposits at December 31, 2014, are as follows ($ in thousands):
2015 |  | $ | 1,462,039 |
2016 |  |  | 272,973 |
2017 |  |  | 114,574 |
2018 |  |  | 52,329 |
2019 and thereafter |  |  | 45,167 |
Total time deposits |  |  | 1,947,082 |
Interest-bearing deposits with no stated maturity |  |  | 5,002,641 |
Total interest-bearing deposits |  | $ | 6,949,723 |

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