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Investments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
No. of securities	211	267
Fair value, Less than 12 months	$ 133,581	$ 164,963
Unrealized losses, Less than 12 months	(2,608)	(4,475)
Fair value, 12 months or longer	13,312	6,380
Unrealized losses, 12 months or longer	(372)	(211)
Fair value, Total	146,893	171,343
Unrealized losses, Total	(2,980)	(4,686)
Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities	18	18
Fair value, Less than 12 months	13,899	16,028
Unrealized losses, Less than 12 months	(302)	(436)
Fair value, 12 months or longer	4,098	2,149
Unrealized losses, 12 months or longer	(149)	(98)
Fair value, Total	17,997	18,177
Unrealized losses, Total	(451)	(534)
Nontaxable Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities	73	91
Fair value, Less than 12 months	18,931	24,496
Unrealized losses, Less than 12 months	(244)	(518)
Fair value, 12 months or longer	3,475	3,151
Unrealized losses, 12 months or longer	(86)	(101)
Fair value, Total	22,406	27,647
Unrealized losses, Total	(330)	(619)
Taxable Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities	67	88
Fair value, Less than 12 months	26,089	35,299
Unrealized losses, Less than 12 months	(434)	(1,030)
Fair value, 12 months or longer	3,359	1,080
Unrealized losses, 12 months or longer	(101)	(12)
Fair value, Total	29,448	36,379
Unrealized losses, Total	(535)	(1,042)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
No. of securities	53	70
Fair value, Less than 12 months	74,662	89,140
Unrealized losses, Less than 12 months	(1,628)	(2,491)
Fair value, 12 months or longer	2,380	0
Unrealized losses, 12 months or longer	(36)	0
Fair value, Total	77,042	89,140
Unrealized losses, Total	$ (1,664)	$ (2,491)

X

- 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)

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