Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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 June 30, 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
June 30, 2016
Securities available for sale:
U.S. Treasury	$	4,120,017	$	—	$	—	$	4,120,017
Residential mortgage-backed securities	—		908,185		—		908,185
States and political subdivisions	—		4,973,354		—		4,973,354
Other	—		42,477		—		42,477
Trading account securities:
U.S. Treasury	13,381		—		—		13,381
States and political subdivisions	—		14,553		—		14,553
Derivative assets:
Interest rate swaps, caps and floors	—		61,344		—		61,344
Commodity swaps and options	—		8,335		—		8,335
Foreign currency forward contracts	21		—		—		21
Derivative liabilities:
Interest rate swaps, caps and floors	—		63,929		—		63,929
Commodity swaps and options	—		8,013		—		8,013
Foreign currency forward contracts	15		—		—		15



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.



	Six Months Ended June 30, 2016					Six Months Ended June 30, 2015
	Level 2		Level 3			Level 2			Level 3
Carrying value of impaired loans before allocations	$	—	$	11,183		$	163		$	2,039
Specific valuation allowance (allocations) reversals of prior allocations	—		(2,944		)	(71		)	(437		)
Fair value	$	—	$	8,239		$	92		$	1,602

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:



	Six Months Ended June 30, 2016
	2016			2015
Foreclosed assets remeasured at initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	425		$	161
Charge-offs recognized in the allowance for loan losses	(3		)	—
Fair value	$	422		$	161
Foreclosed assets remeasured subsequent to initial recognition:
Carrying value of foreclosed assets prior to remeasurement	$	—		$	205
Write-downs included in other non-interest expense	—			(36		)
Fair value	$	—		$	169

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:



	June 30, 2016				December 31, 2015
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 2 inputs:
Cash and cash equivalents	$	3,365,223	$	3,365,223	$	3,591,523	$	3,591,523
Securities held to maturity	2,339,602		2,414,383		2,663,009		2,710,685
Cash surrender value of life insurance policies	176,345		176,345		175,191		175,191
Accrued interest receivable	141,009		141,009		139,986		139,986
Level 3 inputs:
Loans, net	11,434,468		11,455,089		11,350,672		11,396,158
Financial liabilities:
Level 2 inputs:
Deposits	24,287,451		24,287,739		24,343,595		24,344,007
Federal funds purchased and repurchase agreements	733,160		733,160		893,522		893,522
Junior subordinated deferrable interest debentures	136,098		137,115		136,069		137,115
Subordinated notes payable and other borrowings	99,930		99,750		99,870		99,000
Accrued interest payable	1,073		1,073		1,014		1,014