Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Assets And Liabilities Measured On A Recurring Basis [Table Text Block]

The fair value of financial assets and liabilities measured on a recurring basis was as follows as of June 30, 2016 (in thousands):



	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government agency debentures	$	18,909	$	—	$	18,909	$	—
U.S. government agency residential mortgage-backed securities	122,306		—		122,306		—
Municipal and other tax-exempt securities	52,721		—		52,721		—
Other trading securities	17,686		—		17,686		—
Total trading securities	211,622		—		211,622		—
Available for sale securities:
U.S. Treasury	1,004		1,004		—		—
Municipal and other tax-exempt	50,262		—		40,662		9,600
U.S. government agency residential mortgage-backed securities	5,700,268		—		5,700,268		—
Privately issued residential mortgage-backed securities	126,313		—		126,313		—
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,911,946		—		2,911,946		—
Other debt securities	4,151		—		—		4,151
Perpetual preferred stock	17,931		—		17,931		—
Equity securities and mutual funds	18,814		3,785		15,029		—
Total available for sale securities	8,830,689		4,789		8,812,149		13,751
Fair value option securities:
U.S. government agency residential mortgage-backed securities	237,959		—		237,959		—
U.S. Treasury	25,306		25,306		—		—
Total fair value option securities	263,265		25,306		237,959		—
Residential mortgage loans held for sale	430,728		—		420,979		9,749
Mortgage servicing rights¹	190,747		—		—		190,747
Derivative contracts, net of cash collateral²	883,673		7,246		876,427		—
Liabilities:
Derivative contracts, net of cash collateral²	719,159		4,808		714,351		—


¹	A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.

See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded energy and agricultural derivative contacts, net of cash margin. Derivative contacts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate and energy derivative contracts, net of cash margin.

The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2015 (in thousands):



	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government agency debentures	$	61,295	$	—	$	61,295	$	—
U.S. government agency residential mortgage-backed securities	10,989		—		10,989		—
Municipal and other tax-exempt securities	31,901		—		31,901		—
Other trading securities	18,219		—		18,219		—
Total trading securities	122,404		—		122,404		—
Available for sale securities:
U.S. Treasury	995		995		—		—
Municipal and other tax-exempt	56,817		—		47,207		9,610
U.S. government agency residential mortgage-backed securities	5,898,351		—		5,898,351		—
Privately issued residential mortgage-backed securities	139,118		—		139,118		—
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,905,796		—		2,905,796		—
Other debt securities	4,151		—		—		4,151
Perpetual preferred stock	19,672		—		19,672		—
Equity securities and mutual funds	17,833		3,265		14,568		—
Total available for sale securities	9,042,733		4,260		9,024,712		13,761
Fair value option securities:
U.S. government agency residential mortgage-backed securities	444,217		—		444,217		—
U.S. Treasury	—		—		—		—
Total fair value option securities	444,217		—		444,217		—
Residential mortgage loans held for sale	308,439		—		300,565		7,874
Mortgage servicing rights¹	218,605		—		—		218,605
Derivative contracts, net of cash collateral²	586,270		38,530		547,740		—
Liabilities:
Derivative contracts, net of cash collateral²	581,701		—		581,701		—


¹	A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.

See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded energy derivative contacts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate and agricultural derivative contracts, net of cash margin.

The fair value of financial assets and liabilities measured on a recurring basis was as follows as of June 30, 2015 (in thousands):



	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Trading securities:
U.S. government agency debentures	$	40,212	$	—	$	40,212	$	—
U.S. government agency residential mortgage-backed securities	23,090		—		23,090		—
Municipal and other tax-exempt securities	62,801		—		62,801		—
Other trading securities	32,106		—		32,106		—
Total trading securities	158,209		—		158,209		—
Available for sale securities:
U.S. Treasury	1,000		1,000		—		—
Municipal and other tax-exempt	61,624		—		52,007		9,617
U.S. government agency residential mortgage-backed securities	6,339,449		—		6,339,449		—
Privately issued residential mortgage-backed securities	154,150		—		154,150		—
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,401,364		—		2,401,364		—
Other debt securities	4,150		—		—		4,150
Perpetual preferred stock	19,648		—		19,648		—
Equity securities and mutual funds	18,732		4,216		14,516		—
Total available for sale securities	9,000,117		5,216		8,981,134		13,767
Fair value option securities:
U.S. government agency residential mortgage-backed securities	436,324		—		436,324		—
U.S. Treasury	—		—		—		—
Total fair value option securities	436,324		—		436,324		—
Residential mortgage loans held for sale	502,571		—		494,598		7,973
Mortgage servicing rights¹	198,694		—		—		198,694
Derivative contracts, net of cash collateral²	630,435		11,484		618,951		—
Liabilities:
Derivative contracts, net of cash collateral²	620,277		1,080		619,197		—


¹	A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.

See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded energy derivative contacts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) were exchange-traded agricultural derivative contracts.

Fair Value Assets Measured On Recurring Basis, Significant Unobservable Inputs [Table Text Block]

The following represents the changes for the three months ended June 30, 2016 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):



	Available for Sale Securities
	Municipal and other tax-exempt			Other debt securities		Residential mortgage loans held for sale
Balance, March 31, 2016	$	9,614		$	4,151	$	8,099
Transfer to Level 3 from Level 2	—			—		3,080
Purchases and capital calls	—			—		—
Proceeds from sales	—			—		(1,249		)
Redemptions and distributions	—			—		—
Gain (loss) recognized in earnings:
Mortgage banking revenue	—			—		(181		)
Other comprehensive income (loss):
Net change in unrealized gain (loss)	(14		)	—		—
Balance, June 30, 2016	$	9,600		$	4,151	$	9,749

The following represents the changes for the six months ended June 30, 2016 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):



	Available for Sale Securities
	Municipal and other tax-exempt			Other debt securities		Residential mortgage loans held for sale
Balance, Dec. 31, 2015	$	9,610		$	4,151	$	7,874
Transfer to Level 3 from Level 2	—			—		3,540
Purchases and capital calls	—			—		—
Proceeds from sales	—			—		(1,362		)
Redemptions and distributions	—			—		—
Gain (loss) recognized in earnings:
Mortgage banking revenue	—			—		(303		)
Other comprehensive income (loss):
Net change in unrealized gain (loss)	(10		)	—		—
Balance, June 30, 2016	$	9,600		$	4,151	$	9,749

The following represents the changes for the three months ended June 30, 2015 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):



	Available for Sale Securities
	Municipal and other tax-exempt			Other debt securities		Residential mortgage loans held for sale
Balance, March 31, 2015	$	9,623		$	4,150	$	6,870
Transfer to Level 3 from Level 2	—			—		944
Purchases and capital calls	—			—		—
Proceeds from sales	—			—		—
Redemptions and distributions	—			—		—
Gain (loss) recognized in earnings:
Mortgage banking revenue	—			—		159
Other comprehensive income (loss):
Net change in unrealized gain (loss)	(6		)	—		—
Balance, June 30, 2015	$	9,617		$	4,150	$	7,973

The following represents the changes for the six months ended June 30, 2015 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):



	Available for Sale Securities
	Municipal and other tax-exempt			Other debt securities		Residential mortgage loans held for sale
Balance, Dec. 31, 2014	$	10,093		$	4,150	$	11,856
Transfer to Level 3 from Level 2	—			—		1,187
Purchases, and capital calls	—			—		—
Proceeds from sales	—			—		(5,288		)
Redemptions and distributions	(500		)	—		—
Gain (loss) recognized in earnings						—
Mortgage banking revenue	—			—		218
Other comprehensive income (loss):
Net change in unrealized gain (loss)	24			—		—
Balance, June 30, 2015	$	9,617		$	4,150	$	7,973

Fair Value Inputs, Fair Value Measured On a Recurring Basis, Quantitative Information [Table Text Block]

A summary of quantitative information about assets measured at fair value on a recurring basis using Significant Unobservable Inputs (Level 3) as of June 30, 2016 follows (in thousands):



	Par Value		Amortized Cost/Unpaid Principal Balance		Fair Value		Valuation Technique(s)		Unobservable Input	Range (Weighted Average)

Available for sale securities
Municipal and other tax-exempt securities	$	10,370	$	10,312	$	9,600	Discounted cash flows	¹	Interest rate spread	5.34%-5.64% (5.60%)	²
										90.00%-93.28% (92.58%)	³
Other debt securities	4,400		4,400		4,151		Discounted cash flows	¹	Interest rate spread	5.51%-5.96% (5.91%)	⁴
										94.32% - 94.34 (94.34%)	³

Residential mortgage loans held for sale	N/A		10,518		9,749		Quoted prices of loans sold in securitization transactions, with a liquidity discount applied		Liquidity discount applied to the market value of a mortgage loans qualifying for sale to U.S. government agencies.	92.69%


¹	Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume.


²	Interest rate yields used to value investment grade tax-exempt securities represent a spread of 474 to 513 basis points over average yields for comparable tax-exempt securities.


³	Represents fair value as a percentage of par value.


⁴	Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 1 percent.

A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2015 follows (in thousands):



	Par Value		Amortized Cost/Unpaid Principal Balance		Fair Value		Valuation Technique(s)		Unobservable Input	Range (Weighted Average)

Available for sale securities
Municipal and other tax-exempt securities	$	10,370	$	10,311	$	9,610	Discounted cash flows	¹	Interest rate spread	5.47%-5.77% (5.73%)	²
										92.34%-92.93% (92.67%)	³
Other debt securities	4,400		4,400		4,151		Discounted cash flows	¹	Interest rate spread	5.80%-5.92% (5.90%)	⁴
										94.33% - 94.34 (94.34%)	³
Residential mortgage loans held for sale	N/A		8,395		7,874		Quoted prices of loans sold in securitization transactions, with a liquidity discount applied		Liquidity discount applied to the market value of a mortgage loans qualifying for sale to U.S. government agencies.	93.79%


¹	Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume.


²	Interest rate yields used to value investment grade tax-exempt securities represent a spread of 499 to 541 basis points over average yields for comparable tax-exempt securities.


³	Represents fair value as a percentage of par value.


⁴	Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 1 percent.

A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of June 30, 2015 follows (in thousands):



	Par Value		Amortized Cost		Fair Value		Valuation Technique(s)		Unobservable Input	Range (Weighted Average)

Available for sale securities
Municipal and other tax-exempt securities	$	10,370	$	10,310	$	9,617	Discounted cash flows	¹	Interest rate spread	5.11%-5.41% (5.37%)	²
										92.50%-92.85% (92.74%)	³
Other debt securities	4,400		4,400		4,150		Discounted cash flows	¹	Interest rate spread	4.36%-5.69% (5.54%)	⁴
										94.25% - 94.33 (94.32%)	³

Residential mortgage loans held for sale	N/A		8,384		7,973		Quoted prices of loans sold in securitization transactions, with a liquidity discount applied		Liquidity discount applied to the market value of a mortgage loans qualifying for sale to U.S. government agencies.	95.09%


¹	Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume.


²	Interest rate yields used to value investment grade tax-exempt securities represent a spread of 502 to 527 basis points over average yields for comparable tax-exempt securities.


³	Represents fair value as a percentage of par value.


⁴	Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 1 percent.

Fair Value Assets Measured on Nonrecurring Basis [Table Text Block]

The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at June 30, 2016 for which the fair value was adjusted during the three and six months ended June 30, 2016:



							Fair Value Adjustments for the
	Carrying Value at June 30, 2016						Three Months Ended June 30, 2016 Recognized in:				Six Months Ended June 30, 2016 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		Gross charge-offs against allowance for loan losses		Net losses and expenses of repossessed assets, net		Gross charge-offs against allowance for loan losses		Net losses and expenses of repossessed assets, net
Impaired loans	$	—	$	634	$	42,342	$	7,041	$	—	$	29,186	$	—
Real estate and other repossessed assets	—		5,709		1,693		—		751		—		1,068

The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at June 30, 2015 for which the fair value was adjusted during the three and six months ended June 30, 2015:



							Fair Value Adjustments for the
	Carrying Value at June 30, 2015						Three Months Ended June 30, 2015 Recognized in:				Six Months Ended June 30, 2015 Recognized in:
	Quoted Prices in Active Markets for Identical Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		Gross charge-offs against allowance for loan losses		Net losses and expenses of repossessed assets, net		Gross charge-offs against allowance for loan losses		Net losses and expenses of repossessed assets, net
Impaired loans	$	—	$	5,041	$	17	$	574	$	—	$	1,117	$	—
Real estate and other repossessed assets	—		8,046		445		—		533		—		1,126

Fair Value Inputs, Fair Value Measured On a Nonrecurring Basis, Quantitative Information [Table Text Block]

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of June 30, 2016 follows (in thousands):



	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Impaired loans	$	42,342	Discounted cash flows	Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs	25% - 71% (58%)¹
Real estate and other repossessed assets	1,693		Appraised value, as adjusted	Marketability adjustment off appraised value²	68% - 80% (71%)


¹	Represents fair value as a percentage of the unpaid principal balance.


²	Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of June 30, 2015 follows (in thousands):



	Fair Value		Valuation Technique(s)	Unobservable Input	Range (Weighted Average)
Impaired loans	$	17	Appraised value, as adjusted	Broker quotes and management's knowledge of industry and collateral	N/A
Real estate and other repossessed assets	445		Appraised value, as adjusted	Marketability adjustments off appraised value1	41% - 86% (72%)


¹	Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.

Fair Value of Financial Instruments [Table Text Block]

The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of June 30, 2016 (dollars in thousands):



	Carrying Value			Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	498,713		$	498,713	$	498,713	$	—	$	—
Interest-bearing cash and cash equivalents	1,907,838			1,907,838		1,907,838		—		—
Trading securities:								—
U.S. government agency debentures	18,909			18,909		—		18,909		—
U.S. government agency residential mortgage-backed securities	122,306			122,306		—		122,306		—
Municipal and other tax-exempt securities	52,721			52,721		—		52,721		—
Other trading securities	17,686			17,686		—		17,686		—
Total trading securities	211,622			211,622		—		211,622		—
Investment securities:
Municipal and other tax-exempt	334,551			340,700		—		340,700		—
U.S. government agency residential mortgage-backed securities	23,750			25,233		—		25,233		—
Other debt securities	202,410			233,129		—		233,129		—
Total investment securities	560,711			599,062		—		599,062		—
Available for sale securities:
U.S. Treasury	1,004			1,004		1,004		—		—
Municipal and other tax-exempt	50,262			50,262		—		40,662		9,600
U.S. government agency residential mortgage-backed securities	5,700,268			5,700,268		—		5,700,268		—
Privately issued residential mortgage-backed securities	126,313			126,313		—		126,313		—
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,911,946			2,911,946		—		2,911,946		—
Other debt securities	4,151			4,151		—		—		4,151
Perpetual preferred stock	17,931			17,931		—		17,931		—
Equity securities and mutual funds	18,814			18,814		3,785		15,029		—
Total available for sale securities	8,830,689			8,830,689		4,789		8,812,149		13,751
Fair value option securities:
U.S. government agency residential mortgage-backed securities	237,959			237,959		—		237,959		—
U.S. Treasury	25,306			25,306		25,306		—		—
Total fair value option securities	263,265			263,265		25,306		237,959		—
Residential mortgage loans held for sale	430,728			430,728		—		420,979		9,749
Loans:
Commercial	10,356,437			10,172,701		—		—		10,172,701
Commercial real estate	3,581,966			3,563,378		—		—		3,563,378
Residential mortgage	1,880,923			1,913,208		—		—		1,913,208
Personal	587,423			582,353		—		—		582,353
Total loans	16,406,749			16,231,640		—		—		16,231,640
Allowance for loan losses	(243,259		)	—		—		—		—
Loans, net of allowance	16,163,490			16,231,640		—		—		16,231,640
Mortgage servicing rights	190,747			190,747		—		—		190,747
Derivative instruments with positive fair value, net of cash margin	883,673			883,673		7,246		876,427		—
Deposits with no stated maturity	18,512,740			18,512,740		—		—		18,512,740
Time deposits	2,247,061			2,252,212		—		—		2,252,212
Other borrowed funds	6,360,199			6,342,885		—		—		6,342,885
Subordinated debentures	371,812			371,808		—		150,234		221,574
Derivative instruments with negative fair value, net of cash margin	719,159			719,159		4,808		714,351		—



	Carrying Value			Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	573,699		$	573,699	$	573,699	$	—	$	—
Interest-bearing cash and cash equivalents	2,069,900			2,069,900		2,069,900		—		—
Trading securities:								—
U.S. government agency debentures	61,295			61,295		—		61,295		—
U.S. government agency residential mortgage-backed securities	10,989			10,989		—		10,989		—
Municipal and other tax-exempt securities	31,901			31,901		—		31,901		—
Other trading securities	18,219			18,219		—		18,219		—
Total trading securities	122,404			122,404		—		122,404		—
Investment securities:
Municipal and other tax-exempt	365,258			368,910		—		368,910		—
U.S. government agency residential mortgage-backed securities	26,833			27,874		—		27,874		—
Other debt securities	205,745			232,375		—		232,375		—
Total investment securities	597,836			629,159		—		629,159		—
Available for sale securities:
U.S. Treasury	995			995		995		—		—
Municipal and other tax-exempt	56,817			56,817		—		47,207		9,610
U.S. government agency residential mortgage-backed securities	5,898,351			5,898,351		—		5,898,351		—
Privately issued residential mortgage-backed securities	139,118			139,118		—		139,118		—
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,905,796			2,905,796		—		2,905,796		—
Other debt securities	4,151			4,151		—		—		4,151
Perpetual preferred stock	19,672			19,672		—		19,672		—
Equity securities and mutual funds	17,833			17,833		3,265		14,568		—
Total available for sale securities	9,042,733			9,042,733		4,260		9,024,712		13,761
Fair value option securities:
U.S. government agency residential mortgage-backed securities	444,217			444,217		—		444,217		—
U.S. Treasury	—			—		—		—		—
Total fair value option securities	444,217			444,217		—		444,217		—
Residential mortgage loans held for sale	308,439			308,439		—		300,565		7,874
Loans:
Commercial	10,252,531			10,053,952		—		—		10,053,952
Commercial real estate	3,259,033			3,233,476		—		—		3,233,476
Residential mortgage	1,876,893			1,902,976		—		—		1,902,976
Personal	552,697			549,068		—		—		549,068
Total loans	15,941,154			15,739,472		—		—		15,739,472
Allowance for loan losses	(225,524		)	—		—		—		—
Loans, net of allowance	15,715,630			15,739,472		—		—		15,739,472
Mortgage servicing rights	218,605			218,605		—		—		218,605
Derivative instruments with positive fair value, net of cash margin	586,270			586,270		38,530		547,740		—
Deposits with no stated maturity	18,682,094			18,682,094		—		—		18,682,094
Time deposits	2,406,064			2,394,562		—		—		2,394,562
Other borrowed funds	6,051,515			5,600,932		—		—		5,600,932
Subordinated debentures	226,350			223,758		—		—		223,758
Derivative instruments with negative fair value, net of cash margin	581,701			581,701		—		581,701		—



	Carrying Value			Estimated Fair Value		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and due from banks	$	443,577		$	443,577	$	443,577	$	—	$	—
Interest-bearing cash and cash equivalents	2,119,072			2,119,072		2,119,072		—		—
Trading securities:								—
U.S. government agency debentures	40,212			40,212		—		40,212		—
U.S. government agency residential mortgage-backed securities	23,090			23,090		—		23,090		—
Municipal and other tax-exempt securities	62,801			62,801		—		62,801		—
Other trading securities	32,106			32,106		—		32,106		—
Total trading securities	158,209			158,209		—		158,209		—
Investment securities:
Municipal and other tax-exempt	389,824			392,367		—		392,367		—
U.S. government agency residential mortgage-backed securities	30,867			32,133		—		32,133		—
Other debt securities	204,973			217,542		—		217,542		—
Total investment securities	625,664			642,042		—		642,042		—
Available for sale securities:
U.S. Treasury	1,000			1,000		1,000		—		—
Municipal and other tax-exempt	61,624			61,624		—		52,007		9,617
U.S. government agency residential mortgage-backed securities	6,339,449			6,339,449		—		6,339,449		—
Privately issued residential mortgage-backed securities	154,150			154,150		—		154,150		—
Commercial mortgage-backed securities guaranteed by U.S. government agencies	2,401,364			2,401,364		—		2,401,364		—
Other debt securities	4,150			4,150		—		—		4,150
Perpetual preferred stock	19,648			19,648		—		19,648		—
Equity securities and mutual funds	18,732			18,732		4,216		14,516		—
Total available for sale securities	9,000,117			9,000,117		5,216		8,981,134		13,767
Fair value option securities:
U.S. government agency residential mortgage-backed securities	436,324			436,324		—		436,324		—
U.S. Treasury	—			—		—		—		—
Total fair value option securities	436,324			436,324		—		436,324		—
Residential mortgage loans held for sale	502,571			502,571		—		494,598		7,973
Loans:
Commercial	9,775,721			9,605,218		—		—		9,605,218
Commercial real estate	3,033,497			3,011,614		—		—		3,011,614
Residential mortgage	1,884,728			1,913,482		—		—		1,913,482
Personal	430,190			426,983		—		—		426,983
Total loans	15,124,136			14,957,297		—		—		14,957,297
Allowance for loan losses	(201,087		)	—		—		—		—
Loans, net of allowance	14,923,049			14,957,297		—		—		14,957,297
Mortgage servicing rights	198,694			198,694		—		—		198,694
Derivative instruments with positive fair value, net of cash margin	630,435			630,435		11,484		618,951		—
Deposits with no stated maturity	18,435,350			18,435,350		—		—		18,435,350
Time deposits	2,624,379			2,618,625		—		—		2,618,625
Other borrowed funds	5,108,872			5,088,104		—		—		5,088,104
Subordinated debentures	226,278			222,842		—		—		222,842
Derivative instruments with negative fair value, net of cash margin	620,277			620,277		1,080		619,197		—

Fair Value Inputs, Financial Instruments, Quantitative Information [Table Text Block]



	Range of Contractual Yields				Average Re-pricing (in years)	Discount Rate
	Minimum		Maximum		Average	Minimum		Maximum
June 30, 2016
Commercial	0.38	%	30.00	%	0.69	0.55	%	3.68	%
Commercial real estate	0.38	%	18.00	%	0.73	0.80	%	3.65	%
Residential mortgage	1.70	%	18.00	%	1.97	1.25	%	3.75	%
Consumer	0.25	%	21.00	%	0.35	0.71	%	3.91	%

Time deposits	0.03	%	9.64	%	2.15	1.16	%	1.43	%
Other borrowings	0.25	%	3.28	%	0.02	0.30	%	2.92	%
Subordinated debentures	1.32	%	5.38	%	8.35	2.16	%	5.38	%

December 31, 2015
Commercial	0.25	%	30.00	%	0.62	0.52	%	4.34	%
Commercial real estate	0.38	%	18.00	%	0.73	0.95	%	3.93	%
Residential mortgage	1.67	%	18.00	%	2.42	0.86	%	4.25	%
Consumer	0.38	%	21.00	%	0.37	1.19	%	4.11	%

Time deposits	0.02	%	5.50	%	1.78	1.11	%	1.57	%
Other borrowings	0.25	%	3.40	%	0.00	0.20	%	2.89	%
Subordinated debentures	1.05	%	1.05	%	1.37	2.12	%	2.12	%

June 30, 2015
Commercial	0.19	%	30.00	%	0.63	0.49	%	4.42	%
Commercial real estate	0.38	%	18.00	%	0.76	1.01	%	3.77	%
Residential mortgage	1.25	%	18.00	%	2.20	0.97	%	3.99	%
Consumer	0.38	%	21.00	%	0.42	0.78	%	4.16	%

Time deposits	0.02	%	9.64	%	1.68	0.80	%	1.30	%
Other borrowings	0.25	%	5.07	%	0.00	0.08	%	2.65	%
Subordinated debentures	0.96	%	0.96	%	1.88	1.79	%	1.79	%