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Securities Available for Sale and Held to Maturity (1) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Fair value [Abstract] |  |  |  |  |
Estimated fair value, less than 12 months | $ 44,859 |  | $ 44,859 |  | $ 51,327
Estimated fair value, 12 months or more | 957 |  | 957 |  | 202
Total estimated fair value | 45,816 |  | 45,816 |  | 51,529
Gross unrealized losses [Abstract] |  |  |  |  |
Gross unrealized (losses), less than 12 months | (211) |  | (211) |  | (189)
Gross unrealized (losses), 12 months or more | (3) |  | (3) |  | (2)
Total gross unrealized (losses) | (214) |  | (214) |  | (191)
Gains (losses) on investments [Abstract] |  |  |  |  |
Gross realized gains | (1) | 33 | 1,041 | 91 |
Available for Sale, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | 12,642 |  | 12,642 |  |
Due after one year through five years | 74,924 |  | 74,924 |  |
Due after five years through ten years | 381,607 |  | 381,607 |  |
Due after ten years | 33,061 |  | 33,061 |  |
Total amortized cost, before mortgage-backed-securities | 502,234 |  | 502,234 |  |
Mortgage-backed securities | 2,146,552 |  | 2,146,552 |  |
Total amortized cost | 2,648,786 |  | 2,648,786 |  |
Available for Sale, estimated fair value [Abstract] |  |  |  |  |
Due in one year or less | 12,717 |  | 12,717 |  |
Due after one year through five years | 78,933 |  | 78,933 |  |
Due after five years through ten years | 393,544 |  | 393,544 |  |
Due after ten years | 33,517 |  | 33,517 |  |
Total fair value, before mortgage-backed-securities | 518,711 |  | 518,711 |  |
Mortgage-backed securities | 2,205,735 |  | 2,205,735 |  |
Securities available for sale (at fair value) | 2,724,446 |  | 2,724,446 |  | 2,468,993
Held to maturity, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | 2,002 |  | 2,002 |  |
Due after one year through five years | 17,347 |  | 17,347 |  |
Due after five years through ten years | 17,566 |  | 17,566 |  |
Due after ten years | 754 |  | 754 |  |
Total amortized cost, before mortgage-backed-securities | 37,669 |  | 37,669 |  |
Mortgage-backed securities | 7,815 |  | 7,815 |  |
Securities held to maturity | 45,484 |  | 45,484 |  | 57,705
Held to maturity, estimated fair value [Abstract] |  |  |  |  |
Due in one year or less | 2,022 |  | 2,022 |  |
Due after one year through five years | 18,878 |  | 18,878 |  |
Due after five years through ten years | 20,188 |  | 20,188 |  |
Due after ten years | 804 |  | 804 |  |
Total fair value, before mortgage-backed-securities | 41,892 |  | 41,892 |  |
Mortgage-backed securities | 8,380 |  | 8,380 |  |
Securities held to maturity (at fair value) | 50,272 |  | 50,272 |  |
Available-for-sale Securities [Member] |  |  |  |  |
Gains (losses) on investments [Abstract] |  |  |  |  |
Proceeds from calls and sales of securities | 2,710 | 1,175 | 37,536 | 24,171 |
Gross realized gains | (1) | 5 | 1,038 | 57 |
Held-to-maturity Securities [Member] |  |  |  |  |
Gains (losses) on investments [Abstract] |  |  |  |  |
Proceeds from calls of securities | 0 | 2,355 | 175 | 3,645 |
Gross realized gains | 0 | 28 | 3 | 34 |
Obligations of States and Political Subdivisions [Member] |  |  |  |  |
Fair value [Abstract] |  |  |  |  |
Estimated fair value, less than 12 months | 1,886 |  | 1,886 |  | 3,368
Estimated fair value, 12 months or more | 957 |  | 957 |  | 202
Total estimated fair value | 2,843 |  | 2,843 |  | 3,570
Gross unrealized losses [Abstract] |  |  |  |  |
Gross unrealized (losses), less than 12 months | (5) |  | (5) |  | (12)
Gross unrealized (losses), 12 months or more | (3) |  | (3) |  | (2)
Total gross unrealized (losses) | (8) |  | (8) |  | (14)
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |  |  |  |
Fair value [Abstract] |  |  |  |  |
Estimated fair value, less than 12 months | 19,971 |  | 19,971 |  | 1,069
Estimated fair value, 12 months or more | 0 |  | 0 |  | 0
Total estimated fair value | 19,971 |  | 19,971 |  | 1,069
Gross unrealized losses [Abstract] |  |  |  |  |
Gross unrealized (losses), less than 12 months | (19) |  | (19) |  | (1)
Gross unrealized (losses), 12 months or more | 0 |  | 0 |  | 0
Total gross unrealized (losses) | (19) |  | (19) |  | (1)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member] |  |  |  |  |
Fair value [Abstract] |  |  |  |  |
Estimated fair value, less than 12 months | 16,404 |  | 16,404 |  | 46,890
Estimated fair value, 12 months or more | 0 |  | 0 |  | 0
Total estimated fair value | 16,404 |  | 16,404 |  | 46,890
Gross unrealized losses [Abstract] |  |  |  |  |
Gross unrealized (losses), less than 12 months | (164) |  | (164) |  | (176)
Gross unrealized (losses), 12 months or more | 0 |  | 0 |  | 0
Total gross unrealized (losses) | (164) |  | (164) |  | (176)
Asset-backed Securities [Member] |  |  |  |  |
Fair value [Abstract] |  |  |  |  |
Estimated fair value, less than 12 months | 6,598 |  | 6,598 |  |
Estimated fair value, 12 months or more | 0 |  | 0 |  |
Total estimated fair value | 6,598 |  | 6,598 |  |
Gross unrealized losses [Abstract] |  |  |  |  |
Gross unrealized (losses), less than 12 months | (23) |  | (23) |  |
Gross unrealized (losses), 12 months or more | 0 |  | 0 |  |
Total gross unrealized (losses) | $ (23) |  | $ (23) |  |

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