Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

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

The table below summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2016 and December 31, 2015, segregated by the level of the valuation inputs within the fair value hierarchy of ASC Topic 820 utilized to measure fair value.



	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
March 31, 2016
Securities available for sale:
U.S. Treasury	$	3,824,834	$	—	$	—	$	3,824,834
Residential mortgage-backed securities	—		976,640		—		976,640
States and political subdivisions	—		4,223,286		—		4,223,286
Other	—		42,469		—		42,469
Trading account securities:
U.S. Treasury	16,544		—		—		16,544
States and political subdivisions	—		479		—		479
Derivative assets:
Interest rate swaps, caps and floors	—		54,646		—		54,646
Commodity swaps and options	—		12,202		—		12,202
Foreign currency forward contracts	6		—		—		6
Derivative liabilities:
Interest rate swaps, caps and floors	—		57,379		—		57,379
Commodity swaps and options	—		11,863		—		11,863
Foreign currency forward contracts	17		—		—		17



(continued)	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
December 31, 2015
Securities available for sale:
U.S. Treasury	$	3,994,520	$	—	$	—	$	3,994,520
Residential mortgage-backed securities	—		1,041,432		—		1,041,432
States and political subdivisions	—		4,127,959		—		4,127,959
Other	—		42,447		—		42,447
Trading account securities:
U.S. Treasury	16,443		—		—		16,443
States and political subdivisions	—		136		—		136
Derivative assets:
Interest rate swaps, caps and floors	—		38,948		—		38,948
Commodity swaps and options	—		13,564		—		13,564
Foreign currency forward contracts	46		—		—		46
Derivative liabilities:
Interest rate swaps, caps and floors	—		40,693		—		40,693
Commodity swaps and options	—		13,355		—		13,355
Foreign currency forward contracts	28		—		—		28

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.



	Three Months Ended March 31, 2016					Three Months Ended March 31, 2015
	Level 2		Level 3			Level 2			Level 3
Carrying value of impaired loans before allocations	$	—	$	45,751		$	197		$	1,107
Specific valuation allowance (allocations) reversals of prior allocations	—		(11,144		)	(71		)	209
Fair value	$	—	$	34,607		$	126		$	1,316

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:



	Three Months Ended March 31,
	2016			2015
Foreclosed assets remeasured at initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	379		$	67
Charge-offs recognized in the allowance for loan losses	(3		)	—
Fair value	$	376		$	67
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	—		$	138
Write-downs included in other non-interest expense	—			(22		)
Fair value	$	—		$	116

Estimated Fair Values of Financial Instruments

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



	March 31, 2016				December 31, 2015
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents	$	3,863,463	$	3,863,463	$	3,591,523	$	3,591,523
Securities held to maturity	2,368,019		2,425,034		2,663,009		2,710,685
Cash surrender value of life insurance policies	176,058		176,058		175,191		175,191
Accrued interest receivable	99,175		99,175		139,986		139,986
Level 3 inputs:
Loans, net	11,380,155		11,393,803		11,350,672		11,396,158
Financial liabilities:
Level 2 inputs:
Deposits	24,156,975		24,157,311		24,343,595		24,344,007
Federal funds purchased and repurchase agreements	693,886		693,886		893,522		893,522
Junior subordinated deferrable interest debentures	136,083		137,115		136,069		137,115
Subordinated notes payable and other borrowings	99,900		99,745		99,870		99,000
Accrued interest payable	1,100		1,100		1,014		1,014