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Statements of Cash Flow (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplemental Cash Flow Information [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures |
($ in thousands) |  | 2014 |  | 2013 |  | 2012
Cash paid during the period for: |  |  |  |  |  |  |  |  |
Interest |  | $ | 22,221 |  |  | 21,465 |  |  | 18,779 |
Federal income tax |  | 22,699 |  |  | 20,000 |  |  | 6,421 |
Non-cash items: |  |  |  |  |  |
Tax-free exchange of fixed income securities, AFS |  | $ | 20,781 |  |  | 37,965 |  |  | 18,942 |
Tax-free exchange of fixed income securities, HTM |  | 4,289 |  |  | 15,820 |  |  | 25,168 |
Stock split related to equity securities, AFS |  | 334 |  |  | — |  |  | — |
Assets acquired under capital lease arrangements |  | 5,642 |  |  | 2,583 |  |  | 2,091 |
Non-cash purchase of property and equipment |  | 338 |  |  | 20 |  |  | — |

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