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Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Amortized cost	$ 226,682	$ 207,826
Gross unrealized gains	5,560	5,676
Gross unrealized losses	(256)	(202)
Estimated fair value	231,986	213,300
US Treasury Securities [Member]
Amortized cost	500
Gross unrealized gains	1
Gross unrealized losses	0
Estimated fair value	501
Agency Securities [Member]
Amortized cost	14,598	8,804
Gross unrealized gains	46	50
Gross unrealized losses	(24)	(6)
Estimated fair value	14,620	8,848
Nontaxable Municipal Bonds [Member]
Amortized cost	79,495	73,699
Gross unrealized gains	3,293	3,618
Gross unrealized losses	(61)	(31)
Estimated fair value	82,727	77,286
Taxable Municipal Bonds [Member]
Amortized cost	47,598	37,334
Gross unrealized gains	889	818
Gross unrealized losses	(99)	(10)
Estimated fair value	48,388	38,142
Collateralized Mortgage Backed Securities [Member]
Amortized cost	77,135	81,113
Gross unrealized gains	926	889
Gross unrealized losses	(72)	(154)
Estimated fair value	77,989	81,848
Certificates Of Deposit [Member]
Amortized cost	6,754	6,274
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	6,754	6,274
Common Stock [Member]
Amortized cost	602	602
Gross unrealized gains	405	301
Gross unrealized losses	0	(1)
Estimated fair value	$ 1,007	$ 902

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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