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Securities Continuous Unrealized Loss (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 157,023 | $ 35,173
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 6,205 | 181
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 364 | 346
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 136 | 154
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 157,387 | 35,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 6,341 | 335
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 41,593 | 9,966
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,480 | 19
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 41,593 | 9,966
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2,480 | 19
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 108,049 | 25,207
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 3,416 | 162
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 108,049 | 25,207
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 3,416 | 162
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 7,381 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 309 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 7,381 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 309 |
Trust Preferred Securities Individual Issuer [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 364 | 346
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 136 | 154
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 364 | 346
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 136 | $ 154

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