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Investment Securities (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Held-to-maturity debt securities amortized cost disclosures
Due in one year or less, held-to-maturity debt securities amortized cost	$ 1,225,000		$ 1,225,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,225,000		1,225,000
Amortized cost, held-to-maturity debt securities	2,450,000		2,450,000
Held-to-maturity debt securities, Estimated fair value disclosures
Due in one year or less, held-to-maturity debt securities, Estimated fair value	1,225,000		1,225,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,225,000		1,225,000
Estimated fair value, held-to-maturity debt securities	2,450,000		2,450,000
Available-for-sale debt securities amortized cost disclosures
Due in one year or less, available-for-sale debt securities amortized cost	828,000		828,000
Due after one year through five years, available-for-sale debt securities amortized cost	233,000		233,000
Due after five years through ten years, available-for-sale debt securities amortized cost	4,828,000		4,828,000
Due after ten years, available-for-sale debt securities amortized cost	197,460,000		197,460,000
Residential mortgage-backed securities, amortized cost	4,716,507,000		4,716,507,000
Equity securities, amortized cost	13,825,000		13,825,000
Amortized cost, Available for sale securities	4,933,681,000		4,933,681,000		5,041,847,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due in one year or less, available-for-sale debt securities, Estimated Fair Value	828,000		828,000
Due after one year through five years, available-for-sale debt securities, Estimated Fair Value	236,000		236,000
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	4,880,000		4,880,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	203,342,000		203,342,000
Residential mortgage-backed securities, Estimated Fair Value	4,843,601,000		4,843,601,000
Equity securities, Estimated Fair Value	14,761,000		14,761,000
Estimated fair value, Available for sale securities	5,067,648,000		5,067,648,000		5,086,457,000
Amortized cost of available for sale investment securities pledged	2,641,895,000		2,641,895,000
Fair value of available for sale investment securities pledged	2,727,905,000		2,727,905,000
Proceeds from sales and calls of available for sale securities	422,177,000	105,502,000	774,856,000	1,051,172,000
Proceeds from sales of mortgage-backed securities	420,149,000	99,058,000	770,244,000	1,042,678,000
Gross gains realized on sales	1,458,000	2,576,000	2,893,000	30,843,000
Gross losses realized on sales	(13,000)	(3,000)	(32,000)	(6,000)
Impairment charges on available-for-sale investment securities	166,000	258,000	415,000	7,461,000
Impairment charges on available-for-sale investment securities, after tax	$ 107,900	$ 167,700	$ 269,750	$ 4,849,650

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