Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Financial Assets And Financial Liabilities Measured At Fair Value On A Recurring Basis

	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
September 30, 2012
Securities available for sale:
U.S. Treasury	$	3,061,552	$	—	$	—	$	3,061,552
U.S. government agencies/corporations		—		250,145		—		250,145
Residential mortgage-backed securities		—		2,751,883		—		2,751,883
States and political subdivisions		—		2,618,178		—		2,618,178
Other		—		35,887		—		35,887
Trading account securities:
U.S. Treasury		13,761		—		—		13,761
States and political subdivisions		—		1,062		—		1,062
Derivative assets:
Interest rate swaps, caps and floors		—		63,904		683		64,587
Commodity and foreign exchange derivatives		—		6,750		—		6,750
Derivative liabilities:
Interest rate swaps, caps and floors		—		78,135		—		78,135
Commodity and foreign exchange derivatives		—		6,633		—		6,633
December 31, 2011
Securities available for sale:
U.S. Treasury	$	2,056,732	$	—	$	—	$	2,056,732
U.S. government agencies/corporations		—		250,884		—		250,884
Residential mortgage-backed securities		—		3,289,270		—		3,289,270
States and political subdivisions		—		2,154,813		—		2,154,813
Other		—		38,001		—		38,001
Trading account securities:
U.S. Treasury		13,609		—		—		13,609
Derivative assets:
Interest rate swaps, caps and floors		—		60,498		689		61,187
Commodity and foreign exchange derivatives		7		23,304		—		23,311
Derivative liabilities:
Interest rate swaps, caps and floors		—		77,626		—		77,626
Commodity and foreign exchange derivatives		—		23,139		—		23,139

Beginning And Ending Balances Of Derivative Assets Measured At Fair Value On A Recurring Basis

	Nine Months Ended September 30,
	2012			2011
Balance, beginning of period	$	689		$	1,090
Transfers to Level 3		—			457
Cash settlements		(266	)		(1,393	)
Realized gains (losses) included in other non-interest income		208			515
Realized gains (losses) included in other non-interest expense		52			49
Balance, end of period	$	683		$	718

Impaired Loans Remeasured And Reported At Fair Value Of The Underlying Collateral

	Nine Months Ended September 30, 2012						Nine Months Ended September 30, 2011
	Level 2			Level 3			Level 2			Level 3
Carrying value of impaired loans before allocations	$	13,227		$	384		$	9,638		$	3,899
Specific valuation allowance allocations		(2,922	)		(61	)		(3,649	)		(2,431	)
Fair value	$	10,305		$	323		$	5,989		$	1,468

Foreclosed Assets Remeasured And Reported At Fair Value

	Nine Months Ended September 30,
	2012			2011
Foreclosed assets remeasured at initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	6,627		$	20,396
Charge-offs recognized in the allowance for loan losses		(1,291	)		(3,593	)
Fair value	$	5,336		$	16,803
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	10,183		$	6,023
Write-downs included in other non-interest expense		(1,528	)		(2,173	)
Fair value	$	8,655		$	3,850

Estimated Fair Values Of Financial Instruments

	September 30, 2012				December 31, 2011
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents	$	2,752,176	$	2,752,176	$	2,907,592	$	2,907,592
Securities held to maturity		364,997		409,258		365,996		404,461
Cash surrender value of life insurance policies		137,009		137,009		133,967		133,967
Accrued interest receivable		63,216		63,216		78,869		78,869
Level 3 inputs:
Loans, net		8,705,639		8,812,390		7,884,982		7,951,742
Financial liabilities:
Level 2 inputs:
Deposits		18,245,197		18,245,906		16,756,748		16,757,708
Federal funds purchased and repurchase agreements		601,204		601,204		722,202		722,202
Junior subordinated deferrable interest debentures		123,712		123,712		123,712		123,712
Subordinated notes payable and other borrowings		100,012		89,506		100,026		100,101
Accrued interest payable		1,882		1,882		4,431		4,431