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Securities (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Gross unrealized losses and the fair value of the Company's investments |  |
Fair Value less than 12 months | $ 183,690 | $ 41,837
Unrealized losses less than 12 months | (5,839) | (168)
Fair value more than 12 months | 1,141 |
Unrealized losses more than 12 months | (17) |
Total fair value | 184,831 | 41,837
Total unrealized losses | (5,856) | (168)
U.S. Treasury and federal agencies [Member] |  |
Gross unrealized losses and the fair value of the Company's investments |  |
Fair Value less than 12 months | 27,871 | 13,064
Unrealized losses less than 12 months | (614) | (30)
Fair value more than 12 months |  |
Unrealized losses more than 12 months |  |
Total fair value | 27,871 | 13,064
Total unrealized losses | (614) | (30)
State and municipal [Member] |  |
Gross unrealized losses and the fair value of the Company's investments |  |
Fair Value less than 12 months | 55,862 | 11,928
Unrealized losses less than 12 months | (2,403) | (84)
Fair value more than 12 months | 1,141 |
Unrealized losses more than 12 months | (17) |
Total fair value | 57,003 | 11,928
Total unrealized losses | (2,420) | (84)
Federal agency collateralized mortgage obligations [Member] |  |
Gross unrealized losses and the fair value of the Company's investments |  |
Fair Value less than 12 months | 51,644 | 12,719
Unrealized losses less than 12 months | (1,170) | (39)
Fair value more than 12 months |  |
Unrealized losses more than 12 months |  |
Total fair value | 51,644 | 12,719
Total unrealized losses | (1,170) | (39)
Federal agency mortgage-backed pools [Member] |  |
Gross unrealized losses and the fair value of the Company's investments |  |
Fair Value less than 12 months | 48,313 | 4,126
Unrealized losses less than 12 months | (1,652) | (15)
Fair value more than 12 months |  |
Unrealized losses more than 12 months |  |
Total fair value | 48,313 | 4,126
Total unrealized losses | $ (1,652) | $ (15)

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