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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 41,204 | $ 46,992 | $ 45,868
Other comprehensive income (loss), net of tax: |  |  |
Net change in unrealized gain (loss) on investment securities | 344 | (4,452) | (4,405)
Minimum pension liability adjustment | 138 | 2,728 | 1,449
Total other comprehensive income (loss), net of tax | 482 | (1,724) | (2,956)
Comprehensive income | $ 41,686 | $ 45,268 | $ 42,912

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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