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Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | $ (38,449) | $ (22,017) | $ (17,722)
Other comprehensive income (loss) before reclassifications | 10,008 | (16,007) | (2,798)
Reclassification adjustment for loss on derivative financial instruments | 0 | 0 | 2,456
Amounts reclassified from accumulated other comprehensive income (loss) | (4,533) | (425) | (3,953)
Ending Balance | (32,974) | (38,449) | (22,017)
Unrealized Gain (Losses) on Investment Securities Not Other-Than-Temporarily Impaired |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | (23,047) | (6,499) | 5,980
Other comprehensive income (loss) before reclassifications | 10,432 | (14,891) | (7,717)
Reclassification adjustment for loss on derivative financial instruments |  |  | 0
Amounts reclassified from accumulated other comprehensive income (loss) | (5,894) | (1,657) | (4,762)
Ending Balance | (18,509) | (23,047) | (6,499)
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | 273 | 458 | 1,349
Other comprehensive income (loss) before reclassifications | 185 | (185) | 239
Reclassification adjustment for loss on derivative financial instruments |  |  | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | (1,130)
Ending Balance | 458 | 273 | 458
Unrealized Effective Portions of Losses on Forward-Starting Interest Rate Swaps |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | 0 | (15) | (2,546)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0
Reclassification adjustment for loss on derivative financial instruments |  |  | 2,456
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 15 | 75
Ending Balance | 0 | 0 | (15)
Unrecognized Pension and Postretirement Plan Income (Cost) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | (15,675) | (15,961) | (22,505)
Other comprehensive income (loss) before reclassifications | (609) | (931) | 4,680
Reclassification adjustment for loss on derivative financial instruments |  |  | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 1,361 | 1,217 | 1,864
Ending Balance | $ (14,923) | $ (15,675) | $ (15,961)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details
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