INVESTMENTS (Details 3) (USD $) In Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Held-to-Maturity Debt Securities
Amortized Cost/Carrying Value	$ 285,523	$ 309,258
Gross Unrecognized Gains	616	939
Gross Unrecognized Losses	(4,672)	(6,813)
Fair Value	281,467	303,384
Amortized cost of debt securities held-to-maturity by contractual maturity
Total amortized cost	285,523	309,258
Fair value of debt securities held-to-maturity by contractual maturity
Total fair value	281,467	303,384
Maturity duration for held-to-maturity securities with no stated maturities	greater than 10 years	greater than 10 years
Agencies
Held-to-Maturity Debt Securities
Amortized Cost/Carrying Value	266,649	288,407
Gross Unrecognized Gains	439	607
Gross Unrecognized Losses	(3,872)	(6,688)
Fair Value	263,216	282,326
Amortized cost of debt securities held-to-maturity by contractual maturity
Due within 1 year		4,086
After 1 but within 5 years	13,969	3,960
After 5 but within 10 years	25,780	18,994
After 10 years	226,900	261,367
Total amortized cost	266,649	288,407
Fair value of debt securities held-to-maturity by contractual maturity
Due within 1 year		4,117
After 1 but within 5 years	14,235	4,351
After 5 but within 10 years	25,616	18,812
After 10 years	223,365	255,046
Total fair value	263,216	282,326
Corporate
Held-to-Maturity Debt Securities
Amortized Cost/Carrying Value	15,000	15,000
Gross Unrecognized Gains		100
Gross Unrecognized Losses	(800)	(125)
Fair Value	14,200	14,975
Amortized cost of debt securities held-to-maturity by contractual maturity
After 10 years	15,000	15,000
Total amortized cost	15,000	15,000
Fair value of debt securities held-to-maturity by contractual maturity
After 10 years	14,200	14,975
Total fair value	14,200	14,975
Municipals
Held-to-Maturity Debt Securities
Amortized Cost/Carrying Value	3,874	5,851
Gross Unrecognized Gains	177	232
Fair Value	4,051	6,083
Amortized cost of debt securities held-to-maturity by contractual maturity
Due within 1 year	800	2,631
After 1 but within 5 years	3,074	3,220
Total amortized cost	3,874	5,851
Fair value of debt securities held-to-maturity by contractual maturity
Due within 1 year	812	2,685
After 1 but within 5 years	3,239	3,398
Total fair value	$ 4,051	$ 6,083

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