INVESTMENTS (Details 3) (USD $) In Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Held-to-Maturity Debt Securities
Amortized Cost/Carrying Value	$ 318,428	$ 309,258
Gross Unrecognized Gains	1,297	939
Gross Unrecognized Losses	(511)	(6,813)
Fair Value	319,214	303,384
Amortized cost of debt securities held-to-maturity by contractual maturity
Total amortized cost	318,428	309,258
Fair value of debt securities held-to-maturity by contractual maturity
Total fair value	319,214	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	299,554	288,407
Gross Unrecognized Gains	1,137	607
Gross Unrecognized Losses	(111)	(6,688)
Fair Value	300,580	282,326
Amortized cost of debt securities held-to-maturity by contractual maturity
Due within 1 year	2,001	4,086
After 1 but within 5 years	1,972	3,960
After 5 but within 10 years	35,771	18,994
After 10 years	259,810	261,367
Total amortized cost	299,554	288,407
Fair value of debt securities held-to-maturity by contractual maturity
Due within 1 year	2,078	4,117
After 1 but within 5 years	2,158	4,351
After 5 but within 10 years	35,924	18,812
After 10 years	260,420	255,046
Total fair value	300,580	282,326
Corporate
Held-to-Maturity Debt Securities
Amortized Cost/Carrying Value	15,000	15,000
Gross Unrecognized Gains		100
Gross Unrecognized Losses	(400)	(125)
Fair Value	14,600	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	14,600	14,975
Total fair value	14,600	14,975
Municipals
Held-to-Maturity Debt Securities
Amortized Cost/Carrying Value	3,874	5,851
Gross Unrecognized Gains	160	232
Fair Value	4,034	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	803	2,685
After 1 but within 5 years	3,231	3,398
Total fair value	$ 4,034	$ 6,083

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