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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net income available to common shareholders | $ 52,128 | $ 54,097 | $ 52,962
Available-for-Sale Securities |  |  |
Unrealized (loss) gain on available-for-sale securities arising during period | (1,685) | 1,713 | 6,388
Reclassification adjustment for net gains | (3,513) | (2,130) | (1,156)
Other comprehensive (loss) income related to available-for-sale securities | (5,198) | (417) | 5,232
Defined Benefit Pension Plan |  |  |
Amortization of actuarial net gains | 847 | 975 | 669
Recognition of unrealized losses | (690) | (40) | (4,584)
Change in underfunded pension liability | 157 | 935 | (3,915)
Other comprehensive (loss) income before income taxes | (5,041) | 518 | 1,317
Tax effect | 1,861 | (191) | (486)
Other comprehensive (loss) income, net of tax | (3,180) | 327 | 831
Comprehensive income, net of tax | $ 48,948 | $ 54,424 | $ 53,793

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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 -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: 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=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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