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Investments - Unrealized losses (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 140,107 | $ 249,957
Less than 12 Months, Unrealized Losses | (1,855) | (7,236)
12 Months or More, Fair Value | 41,757 | 35,182
12 Months or More, Unrealized Losses | (1,542) | (1,793)
Total Fair Value | 181,864 | 285,139
Total Unrealized Losses | (3,397) | (9,029)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 1,812 | 4,132
Less than 12 Months, Unrealized Losses | (36) | (75)
12 Months or More, Fair Value | 962 | 968
12 Months or More, Unrealized Losses | (4) | (9)
Total Fair Value | 2,774 | 5,100
Total Unrealized Losses | (40) | (84)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 35,386 | 89,556
Less than 12 Months, Unrealized Losses | (899) | (5,007)
12 Months or More, Fair Value | 20,566 | 15,015
12 Months or More, Unrealized Losses | (1,183) | (1,510)
Total Fair Value | 55,952 | 104,571
Total Unrealized Losses | (2,082) | (6,517)
Held-to-maturity Securities |  |
Less than 12 Months, Fair Value | 3,234 |
Less than 12 Months, Unrealized Losses | (46) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total Fair Value | 3,234 |
Total Unrealized Losses | 46 |
U.S. Government agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 95,493 | 148,853
Less than 12 Months, Unrealized Losses | (871) | (2,070)
12 Months or More, Fair Value | 20,229 | 19,199
12 Months or More, Unrealized Losses | (355) | (274)
Total Fair Value | 115,722 | 168,052
Total Unrealized Losses | (1,226) | (2,344)
Other equity securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 7,416 | 7,416
Less than 12 Months, Unrealized Losses | (49) | (84)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total Fair Value | 7,416 | 7,416
Total Unrealized Losses | $ (49) | $ (84)

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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