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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Changes in other comprehensive income [Table Text Block] | The following table presents changes in other comprehensive income:
| Before-Tax Amount |  | Tax Effect |  | Net of Tax Amount
| (in thousands)
Three months ended March 31, 2016 |  |  |  |  |
Unrealized gain on securities | $ | 26,193 |  |  | $ | (9,167 | ) |  | $ | 17,026 |
Reclassification adjustment for securities gains included in net income (1) | (947 | ) |  | 331 |  |  | (616 | )
Amortization of unrealized loss on derivative financial instruments (2) | 6 |  |  | (2 | ) |  | 4 |
Amortization of net unrecognized pension and postretirement items (3) | 717 |  |  | (251 | ) |  | 466 |
Total Other Comprehensive Income | $ | 25,969 |  |  | $ | (9,089 | ) |  | $ | 16,880 |
Three months ended March 31, 2015 |  |  |  |  |
Unrealized gain on securities | $ | 15,371 |  |  | $ | (5,379 | ) |  | $ | 9,992 |
Reclassification adjustment for securities gains included in net income (1) | (4,145 | ) |  | 1,450 |  |  | (2,695 | )
Non-credit related unrealized gains on other-than-temporarily impaired debt securities | 192 |  |  | (67 | ) |  | 125 |
Amortization of unrealized loss on derivative financial instruments(2) | 52 |  |  | (18 | ) |  | 34 |
Amortization of net unrecognized pension and postretirement items (3) | 717 |  |  | (251 | ) |  | 466 |
Total Other Comprehensive Income | $ | 12,187 |  |  | $ | (4,265 | ) |  | $ | 7,922 |
(1) | Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Investment securities gains, net" on the consolidated statements of income. See Note 4, "Investment Securities," for additional details.
(2) | Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Interest expense" on the consolidated statements of income.
(3) | Amounts reclassified out of accumulated other comprehensive income. Before-tax amounts included in "Salaries and employee benefits" on the consolidated statements of income. See Note 8, "Employee Benefit Plans," for additional details.
Changes in each component of accumulated other comprehensive income [Table Text Block] | The following table presents changes in each component of accumulated other comprehensive income, net of tax:
| Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired |  | Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities |  | Unrealized Effective Portions of Losses on Forward-Starting Interest Rate Swaps |  | Unrecognized Pension and Postretirement Plan Income (Costs) |  | Total
| (in thousands)
Three months ended March 31, 2016 |  |  |  |  |  |  |  |  |
Balance at December 31, 2015 | $ | (6,499 | ) |  | $ | 458 |  |  | $ | (15 | ) |  | $ | (15,961 | ) |  | $ | (22,017 | )
Other comprehensive income before reclassifications | 17,026 |  |  | — |  |  | — |  |  | — |  |  | 17,026 |
Amounts reclassified from accumulated other comprehensive income (loss) | (616 | ) |  | — |  |  | 4 |  |  | 466 |  |  | (146 | )
Balance at March 31, 2016 | $ | 9,911 |  |  | $ | 458 |  |  | $ | (11 | ) |  | $ | (15,495 | ) |  | $ | (5,137 | )
Three months ended March 31, 2015 |  |  |  |  |  |  |  |  |
Balance at December 31, 2014 | $ | 5,980 |  |  | $ | 1,349 |  |  | $ | (2,546 | ) |  | $ | (22,505 | ) |  | $ | (17,722 | )
Other comprehensive income before reclassifications | 9,992 |  |  | 125 |  |  | — |  |  | — |  |  | 10,117 |
Amounts reclassified from accumulated other comprehensive income (loss) | (1,661 | ) |  | (1,034 | ) |  | 34 |  |  | 466 |  |  | (2,195 | )
Balance at March 31, 2015 | $ | 14,311 |  |  | $ | 440 |  |  | $ | (2,512 | ) |  | $ | (22,039 | ) |  | $ | (9,800 | )

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e526-108580 + Details
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