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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 26,307 | $ 182,255
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 35 | 8,361
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 74,910 | 80,051
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 15,920 | 25,488
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 60,482 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 249 |
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 2,402 |
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 323 |
U.S. Treasury [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 17,000 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 |
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, unrealized losses | 0 |
U.S. Government Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 62,962
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 3,154
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 18,639 | 13,996
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 440 | 2,067
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 16,929 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 137 |
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 0 |
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 0 |
Residential Mortgage-backed Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 60,781
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 1,801
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 24,823 | 46,570
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 730 | 3,022
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 25,726 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 32 |
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 0 |
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 0 |
Commercial Mortgage-backed Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 9,307 | 21,889
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 35 | 1,134
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, unrealized losses | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 8,110 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 40 |
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 0 |
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 0 |
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |  | 21,201
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |  | 1,149
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |  | 3,051
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |  | 13
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 9,717 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 40 |
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 0 |
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 0 |
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 15,422
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 1,123
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 12,663 | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 343 | 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss | 0 | 0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value | 2,402 | (2,301)
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss | 323 | (559)
Collateralized Debt Obligations [Member] |  |
Schedule of Investments [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, unrealized losses | 0 | 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 18,785 | 16,434
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | $ 14,407 | $ 20,386

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