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Securities Available for Sale and Held to Maturity (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Available for sale securities [Abstract] |  |
Amortized cost | $ 2,648,786 | $ 2,395,263
Gross unrealized gains | 75,871 | 73,918
Gross unrealized (losses) | (211) | (188)
Estimated fair value | 2,724,446 | 2,468,993
Held to maturity securities [Abstract] |  |
Amortized cost | 45,484 | 57,705
Gross unrealized gains | 4,791 | 4,813
Gross unrealized (losses) | (3) | (3)
Estimated fair value | 50,272 | 62,515
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 0 | 0
Gross unrealized (losses) | 0 | 0
Estimated fair value | 0 | 0
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 0 | 0
Gross unrealized (losses) | 0 | 0
Estimated fair value | 0 | 0
Obligations of States and Political Subdivisions [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 37,669 | 42,619
Gross unrealized gains | 4,226 | 4,131
Gross unrealized (losses) | (3) | (2)
Estimated fair value | 41,892 | 46,748
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 3,435 | 4,538
Gross unrealized gains | 257 | 336
Gross unrealized (losses) | 0 | 0
Estimated fair value | 3,692 | 4,874
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 580 | 588
Gross unrealized gains | 48 | 28
Gross unrealized (losses) | 0 | 0
Estimated fair value | 628 | 616
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 1,624 | 7,749
Gross unrealized gains | 8 | 133
Gross unrealized (losses) | 0 | (1)
Estimated fair value | 1,632 | 7,881
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 2,176 | 2,211
Gross unrealized gains | 252 | 185
Gross unrealized (losses) | 0 | 0
Estimated fair value | 2,428 | 2,396
Asset-backed Securities [Member] |  |
Held to maturity securities [Abstract] |  |
Amortized cost | 0 |
Gross unrealized gains | 0 |
Gross unrealized (losses) | 0 |
Estimated fair value | 0 |
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 18 | 3
Gross unrealized gains | 0 | 0
Gross unrealized (losses) | 0 | 0
Estimated fair value | 18 | 3
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 60,290 | 64,573
Gross unrealized gains | 381 | 229
Gross unrealized (losses) | 0 | 0
Estimated fair value | 60,671 | 64,802
Obligations of States and Political Subdivisions [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 202,133 | 190,868
Gross unrealized gains | 13,772 | 11,971
Gross unrealized (losses) | (5) | (12)
Estimated fair value | 215,900 | 202,827
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 20,306 | 11,500
Gross unrealized gains | 1,046 | 945
Gross unrealized (losses) | 0 | 0
Estimated fair value | 21,352 | 12,445
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 229,195 | 340,839
Gross unrealized gains | 8,691 | 7,093
Gross unrealized (losses) | 0 | 0
Estimated fair value | 237,886 | 347,932
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 1,535,208 | 1,570,782
Gross unrealized gains | 30,101 | 44,183
Gross unrealized (losses) | (19) | 0
Estimated fair value | 1,565,290 | 1,614,965
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 361,843 | 216,698
Gross unrealized gains | 19,528 | 9,497
Gross unrealized (losses) | (164) | (176)
Estimated fair value | 381,207 | 226,019
Asset-backed Securities / structured financial products [Member] |  |
Available for sale securities [Abstract] |  |
Amortized cost | 239,793 |
Gross unrealized gains | 2,352 |
Gross unrealized (losses) | (23) |
Estimated fair value | $ 242,122 |

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- Definition This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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