Fair Value of Financial Instruments (Details 2) (USD $)	4 Months Ended	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010
Movement of investment in available-for-sale debt securities
Accretion of discount	$ 347,000	$ 18,071,000	$ 7,256,000
Carrying amount of loans intended to be sold in near term		122,800,000
Level III
Movement of investment in available-for-sale debt securities
Balance at beginning of the period		144,163,000
Purchases		115,795,000
Originations		270,066,000
Transfer in		275,763,000
Sales		(297,726,000)
Maturities		(15,408,000)
Settlements		(36,814,000)
Net increase on assets		311,676,000
Unrealized gain (loss) on assets		(2,201,000)
Realized gain (loss) on assets		10,563,000
Accretion of discount		10,730,000	7,256,000
OTTI		(4,272,000)
Other		(332,000)
Net gain (loss) on assets		14,488,000
Balance at end of the period		470,327,000	144,163,000
Loans held-for-sale at fair value | Level III
Movement of investment in available-for-sale debt securities
Balance at beginning of the period		144,163,000
Purchases			144,163,000
Originations		270,066,000
Transfer in		(7,000,000)
Sales		(294,126,000)
Settlements		(252,000)
Net increase on assets		(31,312,000)
Unrealized gain (loss) on assets		5,760,000
Realized gain (loss) on assets		10,314,000
Other		(332,000)
Net gain (loss) on assets		15,742,000
Balance at end of the period		128,593,000	144,163,000
MBS available-for-sale at fair value | Level III
Movement of investment in available-for-sale debt securities
Purchases		115,795,000
Transfer in		282,763,000
Sales		(3,600,000)
Maturities		(15,408,000)
Settlements		(36,562,000)
Net increase on assets		342,988,000
Unrealized gain (loss) on assets		(7,961,000)
Realized gain (loss) on assets		249,000
Accretion of discount		10,730,000
OTTI		(4,272,000)
Net gain (loss) on assets		(1,254,000)
Balance at end of the period		$ 341,734,000