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Securities Continuous Unrealized Loss (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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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 | $ 43,894 | $ 155,282
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 94 | 8,034
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 76,736 | 16,273
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,829 | 1,715
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 120,630 | 171,555
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2,923 | 9,749
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 | 17,494 | 35,933
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 28 | 3,182
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 23,609 | 8,590
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,345 | 1,376
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 41,103 | 44,523
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,373 | 4,558
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 | 25,730 | 109,774
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 62 | 4,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 52,358 | 7,683
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,483 | 339
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 78,088 | 117,457
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,545 | 4,732
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 | 670 | 9,575
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 4 | 459
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 769 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,439 | 9,575
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 5 | $ 459

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