Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements

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
June 30, 2011
Securities available for sale:
U.S. Treasury	$	794,285	$	—	$	—	$	794,285
Residential mortgage-backed securities		—		2,484,663		—		2,484,663
States and political subdivisions		—		2,115,426		—		2,115,426
Other		—		37,980		—		37,980
Trading account securities:
U.S. Treasury		14,517		—		—		14,517
Derivative assets:
Interest rate swaps, caps and floors		—		44,198		298		44,496
Commodity and foreign exchange derivatives		—		19,418		—		19,418
Derivative liabilities:
Interest rate swaps, caps and floors		—		61,549		—		61,549
Commodity and foreign exchange derivatives		29		19,187		—		19,216
December 31, 2010
Securities available for sale:
U.S. Treasury	$	987,031	$	—	$	—	$	987,031
Residential mortgage-backed securities		—		2,091,330		—		2,091,330
States and political subdivisions		—		2,040,300		—		2,040,300
Other		—		38,809		—		38,809
Trading account securities:
U.S. Treasury		14,986		—		—		14,986
States and political subdivisions		—		115		—		115
Derivative assets:
Interest rate swaps, caps and floors		—		43,633		1,090		44,723
Commodity and foreign exchange derivatives		—		14,177		—		14,177
Derivative liabilities:
Interest rate swaps, caps and floors		—		63,299		—		63,299
Commodity and foreign exchange derivatives		19		14,082		—		14,101

Beginning and Ending Balances of Derivative Assets Measured at Fair Value on a Recurring Basis

	Six Months Ended June 30,
	2011			2010
Balance, beginning of period	$	1,090		$	945
Transfers to Level 3		117			—
Cash settlements		(1,304	)		(233	)
Realized gains (losses) included in other non-interest income		267			758
Realized gains (losses) included in other non-interest expense		128			(78	)
Balance, end of period	$	298		$	1,392

Impaired Loans Remeasured and Reported at Fair Value of the Underlying Collateral

	Six Months Ended June 30, 2011						Six Months Ended June 30, 2010
	Level 2			Level 3			Level 2			Level 3
Carrying value of impaired loans	$	10,420		$	3,871		$	15,688		$	19,879
Specific valuation allowance allocations		(8,030	)		(2,882	)		(2,951	)		(6,232	)
Fair value	$	2,390		$	989		$	12,737		$	13,647

Foreclosed Assets Remeasured and Reported at Fair Value

	Six Months Ended June 30,
	2011			2010
Foreclosed assets remeasured at initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	16,595		$	13,160
Charge-offs recognized in the allowance for loan losses		(3,042	)		(2,367	)
Fair value	$	13,553		$	10,793
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	3,058		$	3,043
Write-downs included in other non-interest expense		(803	)		(1,054	)
Fair value	$	2,255		$	1,989

Estimated Fair Values of Financial Instruments

	June 30, 2011				December 31, 2010
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Cash and cash equivalents	$	3,420,561	$	3,420,561	$	2,820,977	$	2,820,977
Securities		5,796,868		5,817,846		5,456,200		5,468,799
Loans, net		7,945,471		7,973,858		7,990,704		8,038,760
Cash surrender value of life insurance policies		131,883		131,883		129,922		129,922
Non-hedging commercial loan/lease interest rate swaps, caps and floors		44,496		44,496		44,723		44,723
Commodity and foreign exchange derivatives		19,418		19,418		14,177		14,177
Accrued interest receivable		74,010		74,010		72,328		72,328
Financial liabilities:
Deposits		15,104,131		15,105,135		14,479,342		14,480,725
Federal funds purchased and repurchase agreements		574,132		574,132		475,673		475,673
Junior subordinated deferrable interest debentures		123,712		123,712		123,712		123,712
Subordinated notes payable and other borrowings		250,036		252,831		250,045		256,172
Interest rate swap on junior subordinated deferrable interest debentures designated as a hedge of cash flows		9,353		9,353		9,895		9,895
Commercial loan/lease interest rate swaps designated as hedges of fair value		7,496		7,496		8,350		8,350
Non-hedging commercial loan/lease interest rate swaps, caps and floors		44,700		44,700		45,054		45,054
Commodity and foreign exchange derivatives		19,216		19,216		14,101		14,101
Accrued interest payable		9,152		9,152		9,991		9,991