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Investment Securities - Schedule of Unrealized Loss on Securities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | $ 301,101 |
12 Months or Longer | 0 |
Total | 301,101 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 1,727 |
12 Months or Longer | 0 |
Total | 1,727 |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 177,470 |
12 Months or Longer | 0 |
Total | 177,470 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 1,280 |
12 Months or Longer | 0 |
Total | 1,280 |
U.S. Government sponsored entity asset-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 123,631 |
12 Months or Longer | 0 |
Total | 123,631 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 447 |
12 Months or Longer | 0 |
Total | 447 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 10,120 |
12 Months or Longer |  | 38,775
Total | 10,120 | 38,775
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 38 |
12 Months or Longer |  | 32
Total | 38 | 32
Other equity securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months |  |
12 Months or Longer |  | 80
Total |  | 80
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months |  |
12 Months or Longer |  | 32
Total |  | $ 32

X
- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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