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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2013
Equity [Abstract] |
Component of Other Comprehensive Income (Loss) | The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the following table. Reclassification adjustments related to securities available for sale are included in net gain (loss) on securities transactions in the accompanying consolidated statements of income. The change in the net actuarial gain/loss on defined-benefit post-retirement benefit plans is included in the computation of net periodic pension expense (see Note 12 – Defined Benefit Plans). Reclassification adjustments related to interest rate swaps on variable-rate loans are included in interest income and fees on loans in the accompanying consolidated statements of income. Reclassification adjustments related to the interest rate swap on junior subordinated deferrable interest debentures are included in interest expense on junior subordinated deferrable interest debentures in the accompanying consolidated statements of income.
| Three Months Ended September 30, 2013 |  | Three Months Ended September 30, 2012
| Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount |  | Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (551 | ) |  | $ | (193 | ) |  | $ | (358 | ) |  | $ | 40,122 |  |  | $ | 14,043 |  |  | $ | 26,079 |
Change in net unrealized gain on securities transferred to held to maturity | (8,054 | ) |  | (2,818 | ) |  | (5,236 | ) |  | — |  |  | — |  |  | — |
Reclassification adjustment for net (gains) losses included in net income | 14 |  |  | 5 |  |  | 9 |  |  | — |  |  | — |  |  | — |
Total securities available for sale and transferred securities | (8,591 | ) |  | (3,006 | ) |  | (5,585 | ) |  | 40,122 |  |  | 14,043 |  |  | 26,079 |
Defined-benefit post-retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Change in the net actuarial gain/loss | 1,640 |  |  | 574 |  |  | 1,066 |  |  | 1,427 |  |  | 499 |  |  | 928 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |
Change in the accumulated gain/loss on effective cash flow hedge derivatives | (15 | ) |  | (5 | ) |  | (10 | ) |  | (269 | ) |  | (93 | ) |  | (176 | )
Reclassification adjustments for (gains) losses included in net income: |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps on variable-rate loans | (9,345 | ) |  | (3,271 | ) |  | (6,074 | ) |  | (9,345 | ) |  | (3,271 | ) |  | (6,074 | )
Interest rate swap on junior subordinated deferrable interest debentures | 1,120 |  |  | 392 |  |  | 728 |  |  | 1,063 |  |  | 372 |  |  | 691 |
Total derivatives | (8,240 | ) |  | (2,884 | ) |  | (5,356 | ) |  | (8,551 | ) |  | (2,992 | ) |  | (5,559 | )
Total other comprehensive income (loss) | $ | (15,191 | ) |  | $ | (5,316 | ) |  | $ | (9,875 | ) |  | $ | 32,998 |  |  | $ | 11,550 |  |  | $ | 21,448 |
| Nine Months Ended September 30, 2013 |  | Nine Months Ended September 30, 2012
| Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount |  | Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (95,920 | ) |  | $ | (33,572 | ) |  | $ | (62,348 | ) |  | $ | 62,972 |  |  | $ | 22,041 |  |  | $ | 40,931 |
Change in net unrealized gain on securities transferred to held to maturity | (26,258 | ) |  | (9,190 | ) |  | (17,068 | ) |  | — |  |  | — |  |  | — |
Reclassification adjustment for net (gains) losses included in net income | 3 |  |  | 1 |  |  | 2 |  |  | 121 |  |  | 42 |  |  | 79 |
Total securities available for sale and transferred securities | (122,175 | ) |  | (42,761 | ) |  | (79,414 | ) |  | 63,093 |  |  | 22,083 |  |  | 41,010 |
Defined-benefit post-retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Change in the net actuarial gain/loss | 4,919 |  |  | 1,722 |  |  | 3,197 |  |  | 4,084 |  |  | 1,429 |  |  | 2,655 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |
Change in the accumulated gain/loss on effective cash flow hedge derivatives | (48 | ) |  | (17 | ) |  | (31 | ) |  | (760 | ) |  | (266 | ) |  | (494 | )
Reclassification adjustments for (gains) losses included in net income: |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps on variable-rate loans | (28,035 | ) |  | (9,812 | ) |  | (18,223 | ) |  | (28,035 | ) |  | (9,812 | ) |  | (18,223 | )
Interest rate swap on junior subordinated deferrable interest debentures | 3,308 |  |  | 1,158 |  |  | 2,150 |  |  | 3,140 |  |  | 1,099 |  |  | 2,041 |
Total derivatives | (24,775 | ) |  | (8,671 | ) |  | (16,104 | ) |  | (25,655 | ) |  | (8,979 | ) |  | (16,676 | )
Total other comprehensive income (loss) | $ | (142,031 | ) |  | $ | (49,710 | ) |  | $ | (92,321 | ) |  | $ | 41,522 |  |  | $ | 14,533 |  |  | $ | 26,989 |
Schedule of Accumulated Other Comprehensive Income, Net of Tax | Activity in accumulated other comprehensive income (loss), net of tax, was as follows:
| Securities Available For Sale |  | Defined Benefit Plans |  | Derivatives |  | Accumulated Other Comprehensive Income
Balance January 1, 2013 | $ | 245,539 |  |  | $ | (49,071 | ) |  | $ | 41,580 |  |  | $ | 238,048 |
Other comprehensive income (loss) before reclassifications | (79,416 | ) |  | 3,197 |  |  | (31 | ) |  | (76,250 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 2 |  |  | — |  |  | (16,073 | ) |  | (16,071 | )
Net other comprehensive income (loss) during period | (79,414 | ) |  | 3,197 |  |  | (16,104 | ) |  | (92,321 | )
Balance September 30, 2013 | $ | 166,125 |  |  | $ | (45,874 | ) |  | $ | 25,476 |  |  | $ | 145,727 |
Balance January 1, 2012 | $ | 227,052 |  |  | $ | (42,958 | ) |  | $ | 63,640 |  |  | $ | 247,734 |
Other comprehensive income (loss) before reclassifications | 41,010 |  |  | 2,655 |  |  | (16,676 | ) |  | 26,989 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive income (loss) during period | 41,010 |  |  | 2,655 |  |  | (16,676 | ) |  | 26,989 |
Balance September 30, 2012 | $ | 268,062 |  |  | $ | (40,303 | ) |  | $ | 46,964 |  |  | $ | 274,723 |

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- Definition Tabular disclosure of the components of accumulated 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=28358780&loc=SL7669686-108580 + Details
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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=28358780&loc=d3e526-108580 + Details
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