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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
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 March 31, 2018 (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
 
$
37,115

 
$

 
$
37,115

 
$

U.S. government agency residential mortgage-backed securities
 
1,078,085

 

 
1,078,085

 

Municipal and other tax-exempt securities
 
72,013

 

 
72,013

 

Asset-backed securities
 
94,734

 

 
94,734

 

Other trading securities
 
10,485

 

 
10,485

 

Total trading securities
 
1,292,432

 

 
1,292,432

 

Available for sale securities:
 
 

 
 

 
 

 
 

U.S. Treasury
 
491

 
491

 

 

Municipal and other tax-exempt securities
 
20,414

 

 
18,523

 
1,891

U.S. government agency residential mortgage-backed securities
 
5,379,921

 

 
5,379,921

 

Privately issued residential mortgage-backed securities
 
90,160

 

 
90,160

 

Commercial mortgage-backed securities guaranteed by U.S. government agencies
 
2,732,966

 

 
2,732,966

 

Other debt securities
 
25,480

 

 
25,008

 
472

Total available for sale securities
 
8,249,432

 
491

 
8,246,578

 
2,363

Fair value option securities – U.S. government agency residential mortgage-backed securities
 
513,668

 

 
513,668

 

Residential mortgage loans held for sale
 
225,190

 

 
211,319

 
13,871

Mortgage servicing rights1
 
274,978

 

 

 
274,978

Derivative contracts, net of cash collateral2
 
286,687

 
21,373

 
265,314

 

Liabilities:
 
 

 
 
 
 
 
 
Derivative contracts, net of cash collateral2
 
233,202

 
16,497

 
216,705

 

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 5, Mortgage Banking Activities.
2 
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 interest rate and agricultural derivative contacts. 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, 2017 (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
 
$
21,196

 
$

 
$
21,196

 
$

U.S. government agency residential mortgage-backed securities
 
392,673

 

 
392,673

 

Municipal and other tax-exempt securities
 
13,559

 

 
13,559

 

Asset-backed securities
 
23,885

 

 
23,885

 

Other trading securities
 
11,363

 

 
11,363

 

Total trading securities
 
462,676

 

 
462,676

 

Available for sale securities:
 
 

 
 

 
 

 
 

U.S. Treasury
 
1,000

 
1,000

 

 

Municipal and other tax-exempt securities
 
27,080

 

 
22,278

 
4,802

U.S. government agency residential mortgage-backed securities
 
5,309,152

 

 
5,309,152

 

Privately issued residential mortgage-backed securities
 
93,221

 

 
93,221

 

Commercial mortgage-backed securities guaranteed by U.S. government agencies
 
2,834,961

 

 
2,834,961

 

Other debt securities
 
25,481

 

 
25,009

 
472

Perpetual preferred stock
 
15,767

 

 
15,767

 

Equity securities and mutual funds
 
14,916

 

 
14,916

 

Total available for sale securities
 
8,321,578

 
1,000

 
8,315,304

 
5,274

Fair value option securities – U.S. government agency residential mortgage-backed securities
 
755,054

 

 
755,054

 

Residential mortgage loans held for sale
 
221,378

 

 
209,079

 
12,299

Mortgage servicing rights1
 
252,867

 

 

 
252,867

Derivative contracts, net of cash collateral2
 
220,502

 
8,179

 
212,323

 

Liabilities:
 


 
 
 
 
 
 
Derivative contracts, net of cash collateral2
 
171,963

 

 
171,963

 

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 5, Mortgage Banking Activities.
2 
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 interest rate, energy and agricultural derivative contacts. 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 energy derivative contracts, fully offset by cash margin.


The fair value of financial assets and liabilities measured on a recurring basis was as follows as of March 31, 2017 (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
 
$
18,365

 
$

 
$
18,365

 
$

U.S. government agency residential mortgage-backed securities
 
578,977

 

 
578,977

 

Municipal and other tax-exempt securities
 
45,114

 

 
45,114

 

Other trading securities
 
34,700

 

 
34,700

 

Total trading securities
 
677,156

 

 
677,156

 

Available for sale securities:
 
 

 
 

 
 

 
 

U.S. Treasury
 
999

 
999

 

 

Municipal and other tax-exempt securities
 
35,453

 

 
29,731

 
5,722

U.S. government agency residential mortgage-backed securities
 
5,372,916

 

 
5,372,916

 

Privately issued residential mortgage-backed securities
 
108,626

 

 
108,626

 

Commercial mortgage-backed securities guaranteed by U.S. government agencies
 
2,877,028

 

 
2,877,028

 

Other debt securities
 
4,153

 

 

 
4,153

Perpetual preferred stock
 
19,272

 

 
19,272

 

Equity securities and mutual funds
 
18,844

 
3,906

 
14,938

 

Total available for sale securities
 
8,437,291

 
4,905

 
8,422,511

 
9,875

Fair value option securities – U.S. government agency residential mortgage-backed securities
 
441,714

 

 
441,714

 

Residential mortgage loans held for sale
 
248,707

 

 
236,028

 
12,679

Mortgage servicing rights1
 
249,403

 

 

 
249,403

Derivative contracts, net of cash collateral2
 
304,727

 
12,631

 
292,096

 

Liabilities:
 
 

 
 
 
 
 
 
Derivative contracts, net of cash collateral2
 
276,422

 
15,455

 
260,967

 

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 5, Mortgage Banking Activities.
2 
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 interest rate and energy derivative contacts. 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 cash margin.

Fair Value Assets Measured On Recurring Basis, Significant Unobservable Inputs [Table Text Block]
The following represents the changes for the three months ended March 31, 2018 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 securities
 
Other debt securities
 
Residential mortgage loans held for sale
Balance, December 31, 2017
 
$
4,802

 
$
472

 
$
12,299

Transfer to Level 3 from Level 21
 

 

 
2,156

Purchases
 

 

 

Proceeds from sales
 

 

 
(324
)
Redemptions and distributions
 
(3,045
)
 

 

Gain (loss) recognized in earnings:
 
 
 
 
 
 
Mortgage banking revenue
 

 

 
(260
)
Other comprehensive income:
 
 
 
 
 
 
Net change in unrealized gain
 
134

 

 

Balance, March 31, 2018
 
$
1,891

 
$
472

 
$
13,871

1  
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.
 
 
 
 
 
 
 
The following represents the changes for the three months ended March 31, 2017 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 securities
 
Other debt securities
 
Residential mortgage loans held for sale
Balance, December 31, 2016
 
$
5,789

 
$
4,152

 
$
11,617

Transfer to Level 3 from Level 21
 

 

 
1,887

Purchases
 

 

 

Proceeds from sales
 

 

 
(589
)
Redemptions and distributions
 

 

 

Gain (loss) recognized in earnings:
 
 
 
 
 
 
Mortgage banking revenue
 

 

 
(236
)
Other comprehensive income (loss):
 
 
 
 
 
 
Net change in unrealized gain (loss)
 
(67
)
 
1

 

Balance, March 31, 2017
 
$
5,722

 
$
4,153

 
$
12,679

1 
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.

 
 
 
 
 
 
 




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 March 31, 2018 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
 
$
2,050

 
$
2,033

 
$
1,891

 
Discounted cash flows
1 
Interest rate spread
 
6.72%-6.72% (6.72%)
2 
92.25%-92.25% (92.25%)
3 
Other debt securities
 
500

 
500

 
472

 
Discounted cash flows
1 
Interest rate spread
 
6.37%-6.37% (6.37%)
4 
94.36% - 94.36 (94.36%)
3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage loans held for sale
 
N/A

 
14,813

 
13,871

 
Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
 
Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies.
 
93.64%
 
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 457 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 3 percent.


A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2017 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
 
$
5,095

 
$
5,068

 
$
4,802

 
Discounted cash flows
1 
Interest rate spread
 
6.60%-6.60% (6.60%)
2 
92.25%-94.76% (93.75%)
3 
Other debt securities
 
500

 
500

 
472

 
Discounted cash flows
1 
Interest rate spread
 
6.85%-6.85% (6.85%)
4 
94.39% - 94.39 (94.39%)
3 
Residential mortgage loans held for sale
 
N/A

 
12,981

 
12,299

 
Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
 
Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies.
 
94.75%
 
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 372 to 466 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 3 percent.

A summary of quantitative information about Recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2017 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
 
$
6,195

 
$
6,163

 
$
5,722

 
Discounted cash flows
1 
Interest rate spread
 
7.64%-7.94% (7.89%)
2 
90.00%-91.22% (90.75%)
3 
Other debt securities
 
4,400

 
4,400

 
4,153

 
Discounted cash flows
1 
Interest rate spread
 
6.00%-6.84% (6.75%)
4 
94.34% - 94.39 (94.38%)
3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage loans held for sale
 
N/A

 
13,623

 
12,679

 
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.
 
93.07%
 
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 632 to 685 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 3 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 March 31, 2018 for which the fair value was adjusted during the three months ended March 31, 2018:
 
 
 
 
 
 
 
Fair Value Adjustments for the
 
Carrying Value at March 31, 2018
 
Three Months Ended
March 31, 2018
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
Impaired loans
$

 
$
32

 
$
410

 
$
497

 
$

Real estate and other repossessed assets

 
863

 
7,094

 

 
5,192

 
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 March 31, 2017 for which the fair value was adjusted during the three months ended March 31, 2017:
 
 
 
 
 
 
 
Fair Value Adjustments for the
 
Carrying Value at March 31, 2017
 
Three Months Ended
March 31, 2017
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
Impaired loans
$

 
$
462

 
$
1,614

 
$
444

 
$

Real estate and other repossessed assets

 
777

 
418

 

 
293

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 March 31, 2018 follows (in thousands):
 
 
Fair Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
Impaired loans
 
$
410

 
Discounted cash flows
 
Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
45% - 45% (45%)1
Real estate and other repossessed assets
 
7,094

 
Discounted cash flows
 
Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
N/A
1 
Represents fair value as a percentage of the unpaid principal balance.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2017 follows (in thousands):
 
 
Fair Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
Impaired loans
 
$
1,614

 
Discounted cash flows
 
Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
76% - 81% (77%)1
Real estate and other repossessed assets
 
418

 
Appraised value, as adjusted
 
Marketability adjustments off appraised value2
 
65% - 86% (78%)

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.

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 March 31, 2018 (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
 
$
544,534

 
$
544,534

 
$
544,534

 
$

 
$

Interest-bearing cash and cash equivalents
 
2,054,899

 
2,054,899

 
2,054,899

 

 

Trading securities:
 
 
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
37,115

 
37,115

 

 
37,115

 

U.S. government agency residential mortgage-backed securities
 
1,078,085

 
1,078,085

 

 
1,078,085

 

Municipal and other tax-exempt securities
 
72,013

 
72,013

 

 
72,013

 

Asset-backed securities
 
94,734

 
94,734

 

 
94,734

 

Other trading securities
 
10,485

 
10,485

 

 
10,485

 

Total trading securities
 
1,292,432

 
1,292,432

 

 
1,292,432

 

Investment securities:
 
 

 
 

 
 
 
 
 
 
Municipal and other tax-exempt securities
 
197,238

 
198,254

 

 
198,254

 

U.S. government agency residential mortgage-backed securities
 
14,967

 
15,112

 

 
15,112

 

Other debt securities
 
204,467

 
215,495

 

 
215,495

 

Total investment securities
 
416,672

 
428,861

 

 
428,861

 

Available for sale securities:
 
 

 
 

 
 
 
 
 
 
U.S. Treasury
 
491

 
491

 
491

 

 

Municipal and other tax-exempt securities
 
20,414

 
20,414

 

 
18,523

 
1,891

U.S. government agency residential mortgage-backed securities
 
5,379,921

 
5,379,921

 

 
5,379,921

 

Privately issued residential mortgage-backed securities
 
90,160

 
90,160

 

 
90,160

 

Commercial mortgage-backed securities guaranteed by U.S. government agencies
 
2,732,966

 
2,732,966

 

 
2,732,966

 

Other debt securities
 
25,480

 
25,480

 

 
25,008

 
472

Total available for sale securities
 
8,249,432

 
8,249,432

 
491

 
8,246,578

 
2,363

Fair value option securities – U.S. government agency residential mortgage-backed securities
 
513,668

 
513,668

 

 
513,668

 

Residential mortgage loans held for sale
 
225,190

 
225,190

 

 
211,319

 
13,871

Loans:
 
 

 
 

 
 
 
 
 
 
Commercial
 
10,919,667

 
10,682,395

 

 

 
10,682,395

Commercial real estate
 
3,506,782

 
3,437,850

 

 

 
3,437,850

Residential mortgage
 
1,945,769

 
1,926,787

 

 

 
1,926,787

Personal
 
965,632

 
956,570

 

 

 
956,570

Total loans
 
17,337,850

 
17,003,602

 

 

 
17,003,602

Allowance for loan losses
 
(223,967
)
 

 

 

 

Loans, net of allowance
 
17,113,883

 
17,003,602

 

 

 
17,003,602

Mortgage servicing rights
 
274,978

 
274,978

 

 

 
274,978

Derivative instruments with positive fair value, net of cash collateral
 
286,687

 
286,687

 
21,373

 
265,314

 

Deposits with no stated maturity
 
20,038,946

 
20,038,946

 

 

 
20,038,946

Time deposits
 
2,166,254

 
2,115,757

 

 

 
2,115,757

Other borrowed funds
 
6,273,349

 
6,236,468

 

 

 
6,236,468

Subordinated debentures
 
144,687

 
144,976

 

 
144,976

 

Derivative instruments with negative fair value, net of cash collateral
 
233,202

 
233,202

 
16,497

 
216,705

 

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 December 31, 2017 (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
 
$
602,510

 
$
602,510

 
$
602,510

 
$

 
$

Interest-bearing cash and cash equivalents
 
1,714,544

 
1,714,544

 
1,714,544

 

 

Trading securities:
 
 
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
21,196

 
21,196

 

 
21,196

 

U.S. government agency residential mortgage-backed securities
 
392,673

 
392,673

 

 
392,673

 

Municipal and other tax-exempt securities
 
13,559

 
13,559

 

 
13,559

 

Asset-backed securities
 
23,885

 
23,885

 

 
23,885

 

Other trading securities
 
11,363

 
11,363

 

 
11,363

 

Total trading securities
 
462,676

 
462,676

 

 
462,676

 

Investment securities:
 
 

 
 

 
 
 
 
 
 
Municipal and other tax-exempt securities
 
228,186

 
230,349

 

 
230,349

 

U.S. government agency residential mortgage-backed securities
 
15,891

 
16,242

 

 
16,242

 

Other debt securities
 
217,716

 
233,444

 

 
233,444

 

Total investment securities
 
461,793

 
480,035

 

 
480,035

 

Available for sale securities:
 
 

 
 

 
 
 
 
 
 
U.S. Treasury
 
1,000

 
1,000

 
1,000

 

 

Municipal and other tax-exempt securities
 
27,080

 
27,080

 

 
22,278

 
4,802

U.S. government agency residential mortgage-backed securities
 
5,309,152

 
5,309,152

 

 
5,309,152

 

Privately issued residential mortgage-backed securities
 
93,221

 
93,221

 

 
93,221

 

Commercial mortgage-backed securities guaranteed by U.S. government agencies
 
2,834,961

 
2,834,961

 

 
2,834,961

 

Other debt securities
 
25,481

 
25,481

 

 
25,009

 
472

Perpetual preferred stock
 
15,767

 
15,767

 

 
15,767

 

Equity securities and mutual funds
 
14,916

 
14,916

 

 
14,916

 

Total available for sale securities
 
8,321,578

 
8,321,578

 
1,000

 
8,315,304

 
5,274

Fair value option securities – U.S. government agency residential mortgage-backed securities
 
755,054

 
755,054

 

 
755,054

 

Residential mortgage loans held for sale
 
221,378

 
221,378

 

 
208,946

 
12,432

Loans:
 
 

 
 

 
 
 
 
 
 
Commercial
 
10,733,975

 
10,524,627

 

 

 
10,524,627

Commercial real estate
 
3,479,987

 
3,428,733

 

 

 
3,428,733

Residential mortgage
 
1,973,686

 
1,977,721

 

 

 
1,977,721

Personal
 
965,776

 
956,706

 

 

 
956,706

Total loans
 
17,153,424

 
16,887,787

 

 

 
16,887,787

Allowance for loan losses
 
(230,682
)
 

 

 

 

Loans, net of allowance
 
16,922,742

 
16,887,787

 

 

 
16,887,787

Mortgage servicing rights
 
252,867

 
252,867

 

 

 
252,867

Derivative instruments with positive fair value, net of cash collateral
 
220,502

 
220,502

 
8,179

 
212,323

 

Deposits with no stated maturity
 
19,962,889

 
19,962,889

 

 

 
19,962,889

Time deposits
 
2,098,416

 
2,064,558

 

 

 
2,064,558

Other borrowed funds
 
5,709,860

 
5,703,121

 

 

 
5,703,121

Subordinated debentures
 
144,677

 
148,207

 

 
148,207

 

Derivative instruments with negative fair value, net of cash collateral
 
171,963

 
171,963

 

 
171,963

 


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 March 31, 2017 (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
 
$
546,575

 
$
546,575

 
$
546,575

 
$

 
$

Interest-bearing cash and cash equivalents
 
2,220,640

 
2,220,640

 
2,220,640

 

 

Trading securities:
 
 
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
18,365

 
18,365

 

 
18,365

 

U.S. government agency residential mortgage-backed securities
 
578,977

 
578,977

 

 
578,977

 

Municipal and other tax-exempt securities
 
45,114

 
45,114

 

 
45,114

 

Other trading securities
 
34,700

 
34,700

 

 
34,700

 

Total trading securities
 
677,156

 
677,156

 

 
677,156

 

Investment securities:
 
 

 
 

 
 
 
 
 
 
Municipal and other tax-exempt securities
 
298,811

 
301,128

 

 
301,128

 

U.S. government agency residential mortgage-backed securities
 
19,378

 
19,967

 

 
19,967

 

Other debt securities
 
201,213

 
219,568

 

 
219,568

 

Total investment securities
 
519,402

 
540,663

 

 
540,663

 

Available for sale securities:
 
 

 
 

 
 
 
 
 
 
U.S. Treasury
 
999

 
999

 
999

 

 

Municipal and other tax-exempt securities
 
35,453

 
35,453

 

 
29,731

 
5,722

U.S. government agency residential mortgage-backed securities
 
5,372,916

 
5,372,916

 

 
5,372,916

 

Privately issued residential mortgage-backed securities
 
108,626

 
108,626

 

 
108,626

 

Commercial mortgage-backed securities guaranteed by U.S. government agencies
 
2,877,028

 
2,877,028

 

 
2,877,028

 

Other debt securities
 
4,153

 
4,153

 

 

 
4,153

Perpetual preferred stock
 
19,272

 
19,272

 

 
19,272

 

Equity securities and mutual funds
 
18,844

 
18,844

 
3,906

 
14,938

 

Total available for sale securities
 
8,437,291

 
8,437,291

 
4,905

 
8,422,511

 
9,875

Fair value option securities – U.S. government agency residential mortgage-backed securities
 
441,714

 
441,714

 

 
441,714

 

Residential mortgage loans held for sale
 
248,707

 
248,707

 

 
236,028

 
12,679

Loans:
 
 

 
 

 
 
 
 
 
 
Commercial
 
10,327,110

 
10,088,885

 

 

 
10,088,885

Commercial real estate
 
3,871,063

 
3,816,898

 

 

 
3,816,898

Residential mortgage
 
1,946,274

 
1,957,635

 

 

 
1,957,635

Personal
 
847,459

 
838,964

 

 

 
838,964

Total loans
 
16,991,906

 
16,702,382

 

 

 
16,702,382

Allowance for loan losses
 
(248,710
)
 

 

 

 

Loans, net of allowance
 
16,743,196

 
16,702,382

 

 

 
16,702,382

Mortgage servicing rights
 
249,403

 
249,403

 

 

 
249,403

Derivative instruments with positive fair value, net of cash collateral
 
304,727

 
304,727

 
23,128

 
281,599

 

Deposits with no stated maturity
 
20,331,511

 
20,331,511

 

 

 
20,331,511

Time deposits
 
2,243,848

 
2,207,968

 

 

 
2,207,968

Other borrowed funds
 
5,794,928

 
5,790,533

 

 

 
5,790,533

Subordinated debentures
 
144,649

 
140,888

 

 
140,888

 

Derivative instruments with negative fair value, net of cash collateral
 
276,422

 
276,422

 
11,628

 
264,794