Fair Value (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value [Abstract]

Schedule of financial assets and liabilities measured at fair value on recurring basis

	March 31, 2012
	(Level 1)		(Level 2)		Total
Assets
Available for sale debt securities:
U.S. Treasury and government agency securities	$	169,134	$	—	$	169,134
Debt securities issued by states of the United States and political subdivisions of the states		—		95,923		95,923
Corporate debt securities		3,750		—		3,750
Residential mortgage-backed securities		—		2,294,897		2,294,897
Equity securities		14,827		—		14,827
Total available-for-sale securities		187,711		2,390,820		2,578,531
Derivatives
Interest rate contracts - assets		—		14,845		14,845
Total recurring fair value measurements - assets	$	187,711	$	2,405,665	$	2,593,376
Liabilities
Derivatives
Interest rate contracts - liabilities		—		15,656		15,656
Total recurring fair value measurements - liabilities	$	—	$	15,656	$	15,656
	December 31, 2011
	(Level 1)		(Level 2)		Total
Assets
Available for sale debt securities:
U.S. Treasury and government agency securities	$	250,067	$	—	$	250,067
Debt securities issued by states of the United
States and political subdivisions of the states		—		309,665		309,665
Corporate debt securities		4,494		—		4,494
Residential mortgage-backed securities		—		2,480,345		2,480,345
Collateralized mortgage obligations		—		1,446,076		1,446,076
Equity securities		6,253		—		6,253
Total available-for-sale securities		260,814		4,236,086		4,496,900
Derivatives
Interest rate contracts - assets		—		14,952		14,952
Total recurring fair value measurements - assets	$	260,814	$	4,251,038	$	4,511,852
Liabilities
Derivatives
Interest rate contracts - liabilities		—		15,643		15,643
Total recurring fair value measurements - liabilities	$	—	$	15,643	$	15,643

Schedule of financial assets measured at fair value on nonrecurring basis

	(Level 1)		(Level 2)		Total
Impaired loans	$	—	$	53,643	$	53,643
Other real estate owned		—		155,803		155,803
Total nonrecurring fair value measurements	$	—	$	209,446	$	209,446
	Quoted Prices in Active Markets for Identical Assets (Level 1)		December 31, 2011 Significant Other Observable Inputs (Level 2)		Total
Impaired loans	$	—	$	55,252	$	55,252
Other real estate owned		—		144,367		144,367
Total nonrecurring fair value measurements	$	—	$	199,619	$	199,619

Schedule of estimated fair values of financial instruments

	March 31, 2012						Total Fair Value		Carrying Amount
	(Level 1)		(Level 2)		(Level 3)
Financial assets:
Cash, interest-bearing deposits, federal funds sold, and short-term investments	$	1,366,319	$	—	$	—	$	1,366,319	$	1,366,319
Available for sale securities		187,711		2,390,820				2,578,531		2,578,531
Held to maturity securities		182,471		1,632,132				1,814,603		1,815,314
Loans, net		—		—		11,172,701		11,172,701		10,987,936
Loans held for sale		—		—		42,484		42,484		42,484
Accrued interest receivable		52,821		—		—		52,821		52,821
Derivative financial instruments		—		14,845		—		14,845		14,845
Financial liabilities:
Deposits	$	—	$	—	$	15,449,563	$	15,449,563		15,432,767
Federal funds purchased		23,692		—		—		23,692		23,692
Securities sold under agreements to repurchase		826,596		—		—		826,596		826,596
Long-term debt		—		383,483				383,483		360,272
Accrued interest payable		9,093		—		—		9,093		9,093
Derivative financial instruments		—		15,246		—		15,246		15,246
	December 31, 2011						Total Fair Value		Carrying Amount
	(Level 1)		(Level 2)		(Level 3)
Financial assets:
Cash, interest-bearing deposits, federal funds sold, and short-term investments	$	1,622,366	$	—	$	—		1,622,366	$	1,622,366
Available for sale securities		260,814		4,236,086				4,496,900		4,496,900
Loans, net		—		—		11,189,662		11,189,662		11,052,144
Loans held for sale		—		—		72,378		72,378		72,378
Accrued interest receivable		53,973		—		—		53,973		53,973
Derivative financial instruments		—		14,952		—		14,952		14,952
Financial liabilities:
Deposits	$	—	$	—	$	15,737,667	$	15,737,667		15,713,579
Federal funds purchased		16,819		—		—		16,819		16,819
Securities sold under agreements to repurchase		1,027,635		—		—		1,027,635		1,027,635
Long-term debt		—		365,421				365,421		353,890
Accrued interest payable		8,284		—		—		8,284		8,284
Derivative financial instruments		—		15,643		—		15,643		15,643