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Fair Value Measurements (Reconciliation Of Amortized Cost of Fair Value of Investments) (Details) (USD $)	3 Months Ended		12 Months Ended	15 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2011	Dec. 31, 2010
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 3,414,960,000		$ 3,119,510,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	134,441,000		135,959,000
Available-for-sale Securities, Gross Unrealized Losses	(1,325,000)		(325,000)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Securities	3,548,076,000		3,255,144,000
Investment Yield [Abstract]
Available-for-sale Securities, Yield	4.54%		4.62%
Held-to-maturity Securities, Yield	5.32%		5.33%
Yield	4.55%		4.63%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	42,226,000		47,036,000
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Held-to-maturity Securities, Unrecognized Holding Gain	3,259,000		3,580,000
Held to Maturity, Gross Unrecognized Losses [Abstract]
Held-to-maturity Securities, Unrecognized Holding Loss	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, Fair Value	45,485,000		50,616,000
Investments	3,457,186,000		3,166,546,000
Gross Unrealized Gains on Investments	137,700,000		139,539,000
Gross Unrealized Losses on Investments	(1,325,000)		(325,000)
Investments, Fair Value Disclosure	3,593,561,000		3,305,760,000
Available-for-sale securities sold	3,500,000	0
Gain on sale of investments	0			0
US Treasury and Government [Member]
Investment Yield [Abstract]
Yield, After One Through Five Years	0.00%		0.00%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0		0
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Unrecognized Gains, After One Through Five Years	0		0
Held to Maturity, Gross Unrecognized Losses [Abstract]
Unrecognized Holding Losses, After One Year Through Five Years	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value	0		0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment Yield [Abstract]
Yield, Without Single Maturity	5.31%		5.31%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	41,431,000		45,086,000
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Gross Unrecognized Gains Without Single Maturity	3,220,000		3,507,000
Held to Maturity, Gross Unrecognized Losses [Abstract]
Gross Unrecognized Losses Without Single Maturity	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	44,651,000		48,593,000
Municipal Bonds [Member]
Investment Yield [Abstract]
Yield, After One Through Five Years	0.00%		6.52%
Yield, After Five Through Ten Years	5.58%		5.60%
Yield, After Ten Years	0.00%		0.00%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0		405,000
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	795,000		1,545,000
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0		0
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Unrecognized Gains, After One Through Five Years	0		5,000
Unrecognized Holding Gains, After Five Years Through Ten Years	39,000		68,000
Gross Unrecognized Gains, After Ten Years	0		0
Held to Maturity, Gross Unrecognized Losses [Abstract]
Unrecognized Holding Losses, After One Year Through Five Years	0		0
Unrecognized Holding Losses, After Five Through Ten Years	0		0
Gross Unrecognized Losses, After Ten Years	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value	0		410,000
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value	834,000		1,613,000
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	0		0
Municipal Bonds [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	20,456,000		20,461,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains, After Ten Years	3,254,000		3,107,000
Gross Unrealized Losses, Over Ten Years	0		0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	23,710,000		23,568,000
Investment Yield [Abstract]
Yield, After Ten Years	6.45%		6.45%
US Treasury and Government [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	500,000		500,000
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	0		0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	9,300,000		9,300,000
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	136,460,000		175,515,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains, Within One Year	30,000		34,000
Gross Unrealized Gains After One Through Five Years	0		0
Gross Unrealized Gains, Five Through Ten Years	4,324,000		4,547,000
Gross Unrealized Gains, After Ten Years	611,000		631,000
Gross Unrealized Losses, Within One Year	0		0
Gross Unrealized Losses, AFter One Through Five Years	0		0
Gross Unrealized Losses, After Five Years Through Ten Years	0		0
Gross Unrealized Losses, Over Ten Years	0		0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	530,000		534,000
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	0		0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	13,624,000		13,847,000
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	137,071,000		176,146,000
Investment Yield [Abstract]
Yield, Within One Year	4.00%		4.00%
Yield, After One Through Five Years	0.00%		0.00%
Yield, After Five Through Ten Years	10.38%		10.38%
Yield, After Ten Years	2.16%		2.57%
Corporate Debt Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	30,000,000		30,000,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains, Five Through Ten Years	308,000		284,000
Gross Unrealized Losses, After Five Years Through Ten Years	(937,000)		(325,000)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	29,371,000		29,959,000
Investment Yield [Abstract]
Yield, After Five Through Ten Years	4.00%		4.00%
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	3,218,244,000		2,883,734,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains Without Single Maturity	125,914,000		127,356,000
Gross Unrealized Losses Without Single Maturity	(388,000)		0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 3,343,770,000		$ 3,011,090,000
Investment Yield [Abstract]
Yield, Without Single Maturity	4.62%		4.72%

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