CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
INTEREST INCOME:
Mortgage and other loans	$ 1,638,651,000		$ 1,669,871,000		$ 1,325,601,000
Securities and money market investments	228,013,000		243,923,000		309,011,000
Total interest income	1,866,664,000		1,913,794,000		1,634,612,000
INTEREST EXPENSE:
NOW and money market accounts	39,285,000		56,991,000		33,788,000
Savings accounts	15,488,000		20,833,000		15,859,000
Certificates of deposit	102,400,000		138,716,000		163,168,000
Borrowed funds	509,070,000		517,291,000		516,472,000
Total interest expense	666,243,000		733,831,000		729,287,000
Net interest income	1,200,421,000		1,179,963,000		905,325,000
Net interest income after provisions for loan losses	1,100,001,000		1,077,060,000		842,325,000
NON-INTEREST INCOME:
Total OTTI loss on securities	(18,124,000)		(26,456,000)		(106,248,000)
Less: Non-credit portion of OTTI recorded in other comprehensive income (before taxes)			24,485,000		9,715,000
Net OTTI loss recognized in earnings	(18,124,000)		(1,971,000)		(96,533,000)
Fee income	44,874,000		54,584,000		40,074,000
Bank-owned life insurance	28,384,000		28,015,000		27,406,000
Mortgage banking income	80,674,000		183,883,000		12,129,000
Net gain on sales of securities	36,608,000		22,430,000		338,000
FDIC indemnification income	17,633,000		11,308,000
Gain on business disposition	9,823,000
Gain on business acquisitions			2,883,000		139,607,000
Gain on debt repurchases			3,008,000		10,054,000
Other	35,453,000		33,783,000		24,564,000
Total non-interest income	235,325,000		337,923,000		157,639,000
Operating expenses:
Compensation and benefits	293,344,000		274,864,000		184,692,000
Occupancy and equipment	86,903,000		88,070,000		73,724,000
General and administrative	194,436,000		183,312,000		125,587,000
Total operating expenses	574,683,000		546,246,000		384,003,000
Amortization of core deposit intangibles	26,066,000		31,266,000		22,812,000
Total non-interest expense	600,749,000	[1]	577,512,000	[1]	406,815,000
Income before income taxes	734,577,000		837,471,000		593,149,000
Income tax expense	254,540,000		296,454,000		194,503,000
Net income	480,037,000		541,017,000		398,646,000
Other comprehensive (loss) income, net of tax:
Net unrealized (loss) gain on securities and non-credit portion of OTTI losses on securities	(4,334,000)		2,229,000		27,601,000
Change in pension and post-retirement obligations	(21,881,000)		1,979,000		10,405,000
Total comprehensive income, net of tax	453,822,000		545,225,000		436,652,000
Basic earnings per share	$ 1.09		$ 1.24		$ 1.13
Diluted earnings per share	$ 1.09		$ 1.24		$ 1.13
Provision for losses on loans	100,420,000		102,903,000		63,000,000
Non-Covered Loans
Other comprehensive (loss) income, net of tax:
Provision for losses on loans	79,000,000		91,000,000		63,000,000
Covered Loans
NON-INTEREST INCOME:
FDIC indemnification income	17,600,000
Other comprehensive (loss) income, net of tax:
Provision for losses on loans	$ 21,420,000		$ 11,903,000

[1] Includes both direct and indirect expenses.