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Other Comprehensive Income (Reclassifications) (Details 1) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest income - held-to-maturity securities - taxable | $ 21,777,000 | $ 12,220,000 | $ 67,711,000 | $ 31,835,000 |
| Gain (Loss) on Sale of Securities, Net | 198,000 | 184,000 | 17,658,000 | 981,000 |
| Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 0 | 86,000 | 0 | 1,802,000 |
| Interest income - loans and leases | 424,658,000 | 408,997,000 | 1,248,104,000 | 1,221,321,000 |
| Noninterest income - other income | 30,445,000 | 36,845,000 | 97,323,000 | 103,452,000 |
| Other Noninterest Expense | 39,468,000 | 34,640,000 | 123,942,000 | 102,406,000 |
| Transisition obligation | 2,126,000 | 1,934,000 | 7,724,000 | 9,742,000 |
| Income before income taxes | 208,886,000 | 243,883,000 | 632,220,000 | 658,555,000 |
| Income Tax Expense (Benefit) | 53,870,000 | 65,047,000 | 163,442,000 | 175,445,000 |
| Net income applicable to common shareholders | 147,052,000 | 170,869,000 | 444,887,000 | 459,206,000 |
| Interest Income, Securities, Taxable | 43,065,000 | 35,280,000 | 123,549,000 | 114,004,000 |
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Reclassification out of Accumulated Other Comprehensive Income [Member]
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before income taxes | (4,254,000) | |||
| Income Tax Expense (Benefit) | (5,393,000) | 1,489,000 | ||
| Net income applicable to common shareholders | 10,016,000 | (2,765,000) | ||
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Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest income - held-to-maturity securities - taxable | 138,000 | 187,000 | 476,000 | 303,000 |
| Gain (Loss) on Sale of Securities, Net | (388,000) | (3,125,000) | 14,933,000 | (2,754,000) |
| Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 0 | (85,000) | ||
| Income before income taxes | (250,000) | (3,023,000) | 15,409,000 | |
| Income Tax Expense (Benefit) | 88,000 | 1,058,000 | ||
| Net income applicable to common shareholders | (162,000) | (1,965,000) | ||
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Accumulated Other-than-Temporary Impairment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 0 | (1,803,000) | ||
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Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Income before income taxes | 3,853,000 | 11,571,000 | ||
| Income Tax Expense (Benefit) | (1,349,000) | (4,049,000) | ||
| Net income applicable to common shareholders | 2,504,000 | 7,522,000 | ||
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Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Contract [Member]
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest income - loans and leases | 3,935,000 | |||
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Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest income - loans and leases | 148,000 | 3,078,000 | 11,367,000 | |
| Noninterest income - other income | 0 | 7,000 | (82,000) | 204,000 |
| Other Noninterest Expense | 0 | 0 | 0 | 0 |
| Income before income taxes | 148,000 | 3,085,000 | ||
| Income Tax Expense (Benefit) | (52,000) | (1,080,000) | ||
| Net income applicable to common shareholders | 96,000 | 2,005,000 | ||
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Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
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| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] | ||||
| Net actuarial gains (losses) | (8,818,000) | (1,192,000) | (10,594,000) | (21,101,000) |
| Prior service costs | 0 | 0 | 0 | 3,454,000 |
| Transisition obligation | 0 | 0 | ||
| Curtailment | 0 | 32,864,000 | ||
| Income before income taxes | (8,818,000) | 31,672,000 | (10,594,000) | 15,217,000 |
| Income Tax Expense (Benefit) | 3,086,000 | (11,085,000) | 3,708,000 | (5,326,000) |
| Net income applicable to common shareholders | $ (5,732,000) | $ 20,587,000 | $ (6,886,000) | $ 9,891,000 |