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Investment Securities (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 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	$ 1,250,000		$ 1,250,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,325,000		1,325,000
Amortized cost, held-to-maturity debt securities	2,575,000		2,575,000
Held-to-maturity debt securities, Estimated fair value disclosures
Due in one year or less, held-to-maturity debt securities, Estimated fair value	1,250,000		1,250,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,325,000		1,325,000
Estimated fair value, held-to-maturity debt securities	2,575,000		2,575,000
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	4,795,000		4,795,000
Due after ten years, available-for-sale debt securities amortized cost	205,383,000		205,383,000
Residential mortgage-backed securities, amortized cost	4,616,720,000		4,616,720,000
Equity securities, amortized cost	13,825,000		13,825,000
Amortized cost, Available for sale securities	4,840,723,000		4,840,723,000		5,041,847,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	4,882,000		4,882,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	219,633,000		219,633,000
Residential mortgage-backed securities, Estimated Fair Value	4,749,581,000		4,749,581,000
Equity securities, Estimated Fair Value	14,817,000		14,817,000
Estimated fair value, Available for sale securities	4,988,913,000		4,988,913,000		5,086,457,000
Amortized cost of available for sale investment securities pledged	2,575,377,000		2,575,377,000
Fair value of available for sale investment securities pledged	2,672,065,000		2,672,065,000
Proceeds from sales and calls of available for sale securities	152,013,000	17,001,000	926,869,000	1,068,184,000
Proceeds from sales of mortgage-backed securities	150,325,000	15,137,000	920,569,000	1,057,815,000
Gross gains realized on sales	6,588,000	14,000	9,481,000	30,857,000
Gross losses realized on sales	(1,000)	(1,000)	(33,000)	(7,000)
Impairment charges on available-for-sale investment securities	286,000	531,000	701,000	7,992,000
Impairment charges on available-for-sale investment securities, after tax	$ 185,900	$ 345,150	$ 455,650	$ 5,194,800

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The amortized cost of available-for-sale securities that serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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