Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Impaired Loans Remeasured And Reported At Fair Value Specific Valuation Allowance Allocation Method Of Underlying Collateral [Table Text Block]

The following table presents impaired loans that were remeasured and reported at fair value through a specific valuation allowance allocation of the allowance for loan losses based upon the fair value of the underlying collateral during the reported periods.

	Nine Months Ended   September 30, 2014					Nine Months Ended   September 30, 2013
	Level 2		Level 3			Level 2			Level 3
Carrying value of impaired loans before allocations	$	—	$	2,944		$	13,870		$	4,430
Specific valuation allowance allocations	—		(1,275		)	(2,098		)	(2,370		)
Fair value	$	—	$	1,669		$	11,772		$	2,060

Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis

The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:

	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
September 30, 2014
Securities available for sale:
U.S. Treasury	$	2,908,256	$	—	$	—	$	2,908,256
Residential mortgage-backed securities	—		1,483,611		—		1,483,611
States and political subdivisions	—		2,476,787		—		2,476,787
Other	—		42,998		—		42,998
Trading account securities:
U.S. Treasury	15,689		—		—		15,689
States and political subdivisions	—		863		—		863
Derivative assets:
Interest rate swaps, caps and floors	—		39,266		164		39,430
Commodity swaps and options	—		8,720		—		8,720
Foreign currency forward contracts	—		823		—		823
Derivative liabilities:
Interest rate swaps, caps and floors	—		41,907		—		41,907
Commodity swaps and options	—		8,549		—		8,549
Foreign currency forward contracts	—		773		—		773

	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
December 31, 2013
Securities available for sale:
U.S. Treasury	$	2,540,554	$	—	$	—	$	2,540,554
U.S. Government agencies/corporations	—		53,980		—		53,980
Residential mortgage-backed securities	—		1,776,016		—		1,776,016
States and political subdivisions	—		1,488,914		—		1,488,914
Other	—		35,972		—		35,972
Trading account securities:
U.S. Treasury	15,389		—		—		15,389
States and political subdivisions	—		1,009		—		1,009
Derivative assets:
Interest rate swaps, caps and floors	—		44,520		174		44,694
Commodity swaps and options	—		10,026		—		10,026
Foreign currency forward contracts	135		—		—		135
Derivative liabilities:
Interest rate swaps, caps and floors	—		47,542		—		47,542
Commodity swaps and options	—		9,712		—		9,712
Foreign currency forward contracts	85		—		—		85

Foreclosed Assets Remeasured and Reported at Fair Value

The following table presents foreclosed assets that were remeasured and reported at fair value during the reported periods:

	Nine Months Ended   September 30,
	2014			2013
Foreclosed assets remeasured at initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	4,077		$	3,839
Charge-offs recognized in the allowance for loan losses	(285		)	(588		)
Fair value	$	3,792		$	3,251
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	5,002		$	4,778
Write-downs included in other non-interest expense	(1,277		)	(829		)
Fair value	$	3,725		$	3,949

Estimated Fair Values of Financial Instruments

The estimated fair values of financial instruments that are reported at amortized cost in the Corporation’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows:

	September 30, 2014				December 31, 2013
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents	$	5,300,453	$	5,300,453	$	4,556,125	$	4,556,125
Securities held to maturity	2,942,012		2,970,785		3,139,748		3,029,663
Cash surrender value of life insurance policies	171,142		171,142		141,108		141,108
Accrued interest receivable	75,953		75,953		99,281		99,281
Level 3 inputs:
Loans, net	10,648,472		10,712,497		9,423,262		9,582,734
Financial liabilities:
Level 2 inputs:
Deposits	23,490,603		23,491,181		20,688,786		20,689,323
Federal funds purchased and repurchase agreements	580,965		580,965		668,253		668,253
Junior subordinated deferrable interest debentures	137,115		137,115		123,712		123,712
Subordinated notes payable and other borrowings	100,000		94,622		100,000		92,552
Accrued interest payable	1,485		1,485		1,300		1,300