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Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract] |
Aggregate Amounts of Contributions to the 401(k) and ESOP Plans | The aggregate amounts of contributions by the Company to the 401(k) and ESOP plans are shown in the following table:
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
401(k) contributions |  | $ | 2,229 |  |  | $ | 2,074 |  |  | $ | 1,966 |
ESOP contributions |  |  | 2,645 |  |  |  | 2,352 |  |  |  | 1,993 |
Total contributions |  | $ | 4,874 |  |  | $ | 4,426 |  |  | $ | 3,959 |

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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