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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
Fair Value Measurements
Our available-for-sale securities, derivative instruments and certain non-marketable and other securities are financial instruments recorded at fair value on a recurring basis. We make estimates regarding valuation of assets and liabilities measured at fair value in preparing our interim consolidated financial statements.
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (the “exit price”) in an orderly transaction between market participants at the measurement date. There is a three-level hierarchy for disclosure of assets and liabilities recorded at fair value. The classification of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable and the significance of those inputs in the fair value measurement. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect our estimates about market data and views of market participants. The three levels for measuring fair value are based on the reliability of inputs and are as follows:
Level 1
Fair value measurements based on quoted prices in active markets for identical assets or liabilities that we have the ability to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these instruments does not entail a significant degree of judgment. Assets utilizing Level 1 inputs include U.S. Treasury securities, exchange-traded equity securities and certain marketable securities accounted for under fair value accounting.
Level 2
Fair value measurements based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly. Valuations for the available-for-sale securities are provided by independent external pricing service providers who have experience in valuing these securities and by comparison to and/or average of quoted market prices obtained from independent external brokers. We perform a monthly analysis on the values received from third parties to ensure that the prices represent a reasonable estimate of the fair value. The procedures include, but are not limited to, initial and ongoing review of third party pricing methodologies, review of pricing trends and monitoring of trading volumes. Additional corroboration, such as obtaining a non-binding price from a broker, may be obtained depending on the frequency of trades of the security and the level of liquidity or depth of the market. We ensure prices received from independent brokers represent a reasonable estimate of the fair value through the use of observable market inputs including comparable trades, yield curve, spreads and, when available, market indices. As a result of this analysis, if the Company determines that there is a more appropriate fair value based upon the available market data, the price received from the third party is adjusted accordingly. Below is a summary of the significant inputs used for each class of Level 2 assets and liabilities:
U.S. agency debentures: Fair value measurements of U.S. agency debentures are based on the characteristics specific to bonds held, such as issuer name, coupon rate, maturity date and any applicable issuer call option features. Valuations are based on market spreads relative to similar term benchmark market interest rates, generally U.S. Treasury securities.
Agency-issued mortgage-backed securities: Agency-issued mortgage-backed securities are pools of individual conventional mortgage loans underwritten to U.S. agency standards with similar coupon rates, tenor, and other attributes such as geographic location, loan size and origination vintage. Fair value measurements of these securities are based on observable price adjustments relative to benchmark market interest rates taking into consideration estimated loan prepayment speeds.
Agency-issued collateralized mortgage obligations: Agency-issued collateralized mortgage obligations are structured into classes or tranches with defined cash flow characteristics and are collateralized by U.S. agency-issued mortgage pass-through securities. Fair value measurements of these securities incorporate similar characteristics of mortgage pass-through securities such as coupon rate, tenor, geographic location, loan size and origination vintage, in addition to incorporating the effect of estimated prepayment speeds on the cash flow structure of the class or tranche. These measurements incorporate observable market spreads over an estimated average life after considering the inputs listed above.
Agency-issued commercial mortgage-backed securities: Fair value measurements of these securities are based on spreads to benchmark market interest rates (usually U.S. Treasury rates or rates observable in the swaps market), prepayment speeds, loan default rate assumptions and loan loss severity assumptions on underlying loans.
Municipal bonds and notes: Bonds issued by municipal governments generally have stated coupon rates, final maturity dates and are subject to being called ahead of the final maturity date at the option of the issuer. Fair value measurements of these securities are priced based on spreads to other municipal benchmark bonds with similar characteristics; or, relative to market rates on U.S. Treasury bonds of similar maturity.
Interest rate derivative assets and liabilities: Fair value measurements of interest rate derivatives are priced considering the coupon rate of the fixed leg of the contract and the variable coupon on the floating leg of the contract. Valuation is based on both spot and forward rates on the swap yield curve and the credit worthiness of the contract counterparty.
Foreign exchange forward and option contract assets and liabilities: Fair value measurements of these assets and liabilities are priced based on spot and forward foreign currency rates and option volatility assumptions.
Equity warrant assets (public portfolio): Fair value measurements of equity warrant assets of publicly-traded portfolio companies are valued based on the Black-Scholes option pricing model. The model uses the price of publicly-traded companies (underlying stock price), stated strike prices, warrant expiration dates, the risk-free interest rate and market-observable option volatility assumptions.
Level 3
The fair value measurement is derived from valuation techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect our own estimates of assumptions we believe market participants would use in pricing the asset. Below is a summary of the valuation techniques used for each class of Level 3 assets:
Other venture capital investments: Fair value measurements are based on consideration of a range of factors including, but not limited to, the price at which the investment was acquired, the term and nature of the investment, local market conditions, values for comparable securities, and as it relates to the private company, the current and projected operating performance, exit strategies and financing transactions subsequent to the acquisition of the investment. The significant unobservable inputs used in the fair value measurement include the information about each portfolio company, including actual and forecasted results, cash position, recent or planned transactions and market comparable companies. Significant changes to any one of these inputs in isolation could result in a significant change in the fair value measurement, however, we generally consider all factors available through ongoing communication with the portfolio companies and venture capital fund managers to determine whether there are changes to the portfolio company or the environment that indicate a change in the fair value measurement.
Other securities: Fair value measurements of equity securities of public companies are priced based on quoted market prices less a discount if the securities are subject to certain sales restrictions. Marketability discounts generally range from 10% to 20% depending on the duration of the sale restrictions which typically range from 3 to 6 months.
Equity warrant assets (public portfolio): Fair value measurements of equity warrant assets of publicly-traded portfolio companies are valued based on the Black-Scholes option pricing model. The model uses the price of publicly-traded companies (underlying stock price), stated strike prices, warrant expiration dates, the risk-free interest rate and market-observable option volatility assumptions. Modeled asset values are further adjusted by applying a discount of up to 20% for certain warrants that have lock-up restrictions or other features that indicate a discount to fair value is warranted. As a lock-up term nears, and other sale restrictions are lifted, discounts are adjusted downward to zero percent once all restrictions expire or are removed.
Equity warrant assets (private portfolio): Fair value measurements of equity warrant assets of private portfolio companies are priced based on a modified Black-Scholes option pricing model to estimate the asset value by using stated strike prices, option expiration dates, risk-free interest rates and option volatility assumptions. Option volatility assumptions used in the modified Black-Scholes model are based on public market indices whose members operate in similar industries as companies in our private company portfolio. Option expiration dates are modified to account for estimates to actual life relative to stated expiration. Overall model asset values are further adjusted for a general lack of liquidity due to the private nature of the associated underlying company. There is a direct correlation between changes in the volatility and remaining life assumptions in isolation and the fair value measurement while there is an inverse correlation between changes in the liquidity discount assumption and the fair value measurement.
It is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. When available, we use quoted market prices to measure fair value. If market prices are not available, fair value measurement is based upon valuation techniques that use primarily market-based or independently-sourced market parameters, including interest rate yield curves, prepayment speeds, option volatilities and currency rates. Substantially all of our financial instruments use the foregoing methodologies, and are categorized as a Level 1 or Level 2 measurement in the fair value hierarchy. However, in certain cases, when market observable inputs for our valuation techniques may not be readily available, we are required to make judgments about assumptions we believe market participants would use in estimating the fair value of the financial instrument, and based on the significance of those judgments, the measurement may be determined to be a Level 3 fair value measurement.
The degree of management judgment involved in determining the fair value of a financial instrument is dependent upon the availability of quoted market prices or observable market parameters. For financial instruments that trade actively and have quoted market prices or observable market parameters, there is minimal subjectivity involved in measuring fair value. When observable market prices and parameters are not fully available, management judgment is necessary to estimate fair value. For inactive markets, there is little information, if any, to evaluate if individual transactions are orderly. Accordingly, we are required to estimate, based upon all available facts and circumstances, the degree to which orderly transactions are occurring and provide more weighting to price quotes that are based upon orderly transactions. In addition, changes in the market conditions may reduce the availability of quoted prices or observable data. For example, reduced liquidity in the capital markets or changes in secondary market activities could result in observable market inputs becoming unavailable. Therefore, when market data is not available, we use valuation techniques requiring more management judgment to estimate the appropriate fair value measurement. Accordingly, the degree of judgment exercised by management in determining fair value is greater for financial assets and liabilities categorized as Level 3.
The following fair value hierarchy table presents information about our assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2016:
(Dollars in thousands)
 
Level 1
 
Level 2
 
Level 3
 
Balance at
March 31, 2016
Assets
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
9,954,354

 
$

 
$

 
$
9,954,354

U.S. agency debentures
 

 
2,485,431

 

 
2,485,431

Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
Agency-issued collateralized mortgage obligations - fixed rate
 

 
1,312,017

 

 
1,312,017

Agency-issued collateralized mortgage obligations - variable rate
 

 
573,034

 

 
573,034

Equity securities
 
159

 
2,084

 

 
2,243

Total available-for-sale securities
 
9,954,513

 
4,372,566

 

 
14,327,079

Non-marketable and other securities (fair value accounting):
 
 
 
 
 
 
 
 
Non-marketable securities:
 
 
 
 
 
 
 
 
Venture capital and private equity fund investments measured at net asset value (1)
 

 

 

 
145,649

Other venture capital investments (2)
 

 

 
2,040

 
2,040

Other securities (2)
 
468

 

 

 
468

Total non-marketable and other securities (fair value accounting)
 
468

 

 
2,040

 
148,157

Other assets:
 
 
 
 
 
 
 
 
Interest rate swaps
 

 
2,400

 

 
2,400

Foreign exchange forward and option contracts
 

 
47,619

 

 
47,619

Equity warrant assets
 

 
1,688

 
128,982

 
130,670

Client interest rate derivatives
 

 
6,432

 

 
6,432

Total assets (2)
 
$
9,954,981

 
$
4,430,705

 
$
131,022

 
$
14,662,357

Liabilities
 
 
 
 
 
 
 
 
Foreign exchange forward and option contracts
 
$

 
$
45,428

 
$

 
$
45,428

Client interest rate derivatives
 

 
7,263

 

 
7,263

Total liabilities
 
$

 
$
52,691

 
$

 
$
52,691

 
 
(1)
In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.
(2)
Included in Level 1 and Level 3 assets are $0.4 million and $1.8 million, respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests.

The following fair value hierarchy table presents information about our assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2015:
(Dollars in thousands)
 
Level 1
 
Level 2
 
Level 3
 
Balance at December 31, 2015
Assets
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
$
11,678,035

 
$

 
$

 
$
11,678,035

U.S. agency debentures
 

 
2,690,029

 

 
2,690,029

Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
Agency-issued collateralized mortgage obligations - fixed rate
 

 
1,399,279

 

 
1,399,279

Agency-issued collateralized mortgage obligations - variable rate
 

 
607,936

 

 
607,936

Equity securities
 
4,517

 
952

 

 
5,469

Total available-for-sale securities
 
11,682,552

 
4,698,196

 

 
16,380,748

Non-marketable and other securities (fair value accounting):
 
 
 
 
 
 
 
 
Non-marketable securities:
 
 
 
 
 
 
 
 
Venture capital and private equity fund investments measured at net asset value (1)
 

 

 

 
152,237

Other venture capital investments (2)
 

 

 
2,040

 
2,040

Other securities (2)
 
548

 

 

 
548

Total non-marketable and other securities (fair value accounting)
 
548

 

 
2,040

 
154,825

Other assets:
 
 
 
 
 
 
 
 
Interest rate swaps
 

 
2,768

 

 
2,768

Foreign exchange forward and option contracts
 

 
31,237

 

 
31,237

Equity warrant assets
 

 
1,937

 
135,168

 
137,105

Client interest rate derivatives
 

 
3,973

 

 
3,973

Total assets (2)
 
$
11,683,100

 
$
4,738,111

 
$
137,208

 
$
16,710,656

Liabilities
 
 
 
 
 
 
 
 
Foreign exchange forward and option contracts
 
$

 
$
26,353

 
$

 
$
26,353

Client interest rate derivatives
 

 
4,384

 

 
4,384

Total liabilities
 
$

 
$
30,737

 
$

 
$
30,737

 
 
(1)
In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.
(2)
Included in Level 1 and Level 3 assets are $0.4 million and $1.8 million, respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests.
The following table presents additional information about Level 3 assets measured at fair value on a recurring basis for the three months ended March 31, 2016 and 2015, respectively:
(Dollars in thousands)
 
Beginning
Balance
 
Total Realized and Unrealized Gains (Losses) Included in Income
 
Purchases  
 
Sales
 
Issuances  
 
Distributions and Other Settlements
 
Transfers Out of Level 3
 
Ending
Balance
Three months ended March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-marketable and other securities (fair value accounting):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other venture capital investments
 
$
2,040

 
$
(30
)
 
$

 
$

 
$

 
$
30

 
$

 
$
2,040

Total non-marketable and other securities (fair value accounting) (1)
 
2,040

 
(30
)
 

 

 

 
30

 

 
2,040

Other assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Equity warrant assets (2)
 
135,168

 
7,179

 

 
(15,416
)
 
2,374

 

 
(323
)
 
128,982

Total assets
 
$
137,208

 
$
7,149

 
$

 
$
(15,416
)
 
$
2,374

 
$
30

 
$
(323
)
 
$
131,022

Three months ended March 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-marketable and other securities (fair value accounting):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other venture capital investments (3)
 
$
3,291

 
$
131

 
$

 
$
(32
)
 
$

 
$

 
$

 
$
3,390

Total non-marketable and other securities (fair value accounting) (1)
 
3,291

 
131

 

 
(32
)
 

 

 

 
3,390

Other assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Equity warrant assets (2)
 
114,698

 
20,084

 

 
(14,765
)
 
2,487

 

 
(243
)
 
122,261

Total assets
 
$
117,989

 
$
20,215

 
$

 
$
(14,797
)
 
$
2,487

 
$

 
$
(243
)
 
$
125,651

 
 
(1)
Realized and unrealized gains (losses) are recorded in the line items “(losses) gains on investment securities, net” a component of noninterest income.
(2)
Realized and unrealized gains (losses) are recorded in the line item “(losses) gains on derivative instruments, net”, a component of noninterest income.
(3)
Beginning balance was adjusted to conform with our adoption of the new accounting standard (ASU 2015-02), Amendments to the Consolidation Analysis (Topic 820).
The following table presents the amount of net unrealized gains and losses included in earnings (which is inclusive of noncontrolling interest) attributable to Level 3 assets still held at March 31, 2016 and 2015, respectively:
 
 
Three months ended March 31,
(Dollars in thousands)
 
2016
 
2015
Non-marketable and other securities (fair value accounting):
 
 
 
 
Other venture capital investments
 
$

 
$
99

Other assets:
 
 
 
 
Equity warrant assets (2)
 
1,465

 
16,261

Total unrealized gains, net
 
$
1,465

 
$
16,360

Unrealized gains attributable to noncontrolling interests
 
$

 
$
88


 
 
(1)
Unrealized gains (losses) are recorded in the line item “(losses) gains on investment securities, net”, a component of noninterest income.
(2)
Unrealized gains (losses) are recorded in the line item “(losses) gains on derivative instruments, net”, a component of noninterest income.
The extent to which any unrealized gains will become realized is subject to a variety of factors, including, among other things, the expiration of current sales restrictions to which these securities are subject, the actual sales of securities and the timing of such actual sales.
The following table presents quantitative information about the significant unobservable inputs used for certain of our Level 3 fair value measurements at March 31, 2016 and December 31, 2015. We have not included in this table our venture capital and private equity fund investments (fair value accounting) as we use net asset value per share (as obtained from the general partners of the investments) as a practical expedient to determine fair value.
(Dollars in thousands)
 
Fair value
 
Valuation Technique
 
Significant Unobservable Inputs
 
Weighted 
Average
March 31, 2016:
 
 
 
 
 
 
 
 
Other venture capital investments (fair value accounting)
 
$
2,040

 
Private company equity pricing
 
(1)
 
(1
)
Equity warrant assets (public portfolio)
 
165

 
Modified Black-Scholes option pricing model
 
Volatility
 
41.5
%
 
 
 
 
Risk-Free interest rate
 
1.3
%
 
 
 
 
Sales restrictions discount (2)
 
16.8
%
Equity warrant assets (private portfolio)
 
128,817

 
Modified Black-Scholes option pricing model
 
Volatility
 
36.9
%
 
 
 
 
Risk-Free interest rate
 
0.8
%
 
 
 
 
Marketability discount (3)
 
17.3
%
 
 
 
 
Remaining life assumption (4)
 
45.0
%
December 31, 2015:
 
 
 
 
 
 
 
 
Other venture capital investments (fair value accounting)
 
$
2,040

 
Private company equity pricing
 
(1)
 
(1
)
Equity warrant assets (public portfolio)
 
1,786

 
Modified Black-Scholes option pricing model
 
Volatility
 
38.1
%
 
 
 
 
Risk-Free interest rate
 
2.1
%
 
 
 
 
Sales restrictions discount (2)
 
18.0
%
Equity warrant assets (private portfolio)
 
133,382

 
Modified Black-Scholes option pricing model
 
Volatility
 
36.0
%
 
 
 
 
Risk-Free interest rate
 
1.1
%
 
 
 
 
Marketability discount (3)
 
16.6
%
 
 
 
 
Remaining life assumption (4)
 
45.0
%
 
 
 
(1)
In determining the fair value of our other venture capital investment portfolio, we evaluate a variety of factors related to each underlying private portfolio company including, but not limited to, actual and forecasted results, cash position, recent or planned transactions and market comparable companies. Additionally, we have ongoing communication with the portfolio companies and venture capital fund managers, to determine whether there is a material change in fair value. These factors are specific to each portfolio company and a weighted average or range of values of the unobservable inputs is not meaningful.
(2)
We adjust quoted market prices of public companies, which are subject to certain sales restrictions. Sales restriction discounts generally range from 10% to 20% depending on the duration of the sales restrictions, which typically range from 3 to 6 months.
(3)
Our marketability discount is applied to all private company warrants to account for a general lack of liquidity due to the private nature of the associated underlying company. The quantitative measure used is based upon various option-pricing models. On a quarterly basis, a sensitivity analysis is performed on our marketability discount.
(4)
We adjust the contractual remaining term of private company warrants based on our estimate of the actual remaining life, which we determine by utilizing historical data on cancellations and exercises. At March 31, 2016, the weighted average contractual remaining term was 5.6 years, compared to our estimated remaining life of 2.5 years. On a quarterly basis, a sensitivity analysis is performed on our remaining life assumption.
For the three months ended March 31, 2016 and 2015, we did not have any transfers between Level 2 and Level 1 or transfers between Level 3 and Level 1. Transfers from Level 3 to Level 2 for the three months ended March 31, 2016 were due primarily due to the expiration of lock-up, and other sales restrictions on certain of our public warrant positions. Transfers from Level 3 to Level 2 for the three months ended March 31, 2015 were due primarily to the transfer of equity warrant assets from our private portfolio to our public portfolio (see our Level 3 reconciliation above). All amounts reported as transfers represent the fair value as of the date of the change in circumstances that caused the transfer.
Financial Instruments not Carried at Fair Value
FASB guidance over financial instruments requires that we disclose estimated fair values for our financial instruments not carried at fair value. Fair value estimates, methods and assumptions, set forth below for our financial instruments, are made solely to comply with these requirements.
Fair values are based on estimates or calculations at the transaction level using present value techniques in instances where quoted market prices are not available. Because broadly traded markets do not exist for many of our financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. The aggregation of the fair value calculations presented herein does not represent, and should not be construed to represent, the underlying value of the Company.
The following describes the methods and assumptions used in estimating the fair values of financial instruments for which carrying value approximates fair value and estimated fair values of financial instruments not recorded at fair value on a recurring basis and excludes financial instruments and assets and liabilities already recorded at fair value as described above.
Financial Instruments for which Carrying Value Approximates Fair Value
Certain financial instruments that are not carried at fair value on the Consolidated Balance Sheets are carried at amounts that approximate fair value, due to their short-term nature and generally negligible credit risk. These instruments include cash and cash equivalents; FHLB and FRB stock; accrued interest receivable; short-term borrowings; short-term time deposits; and accrued interest payable. In addition, U.S. GAAP requires that the fair value of deposit liabilities with no stated maturity (i.e., demand, savings and certain money market deposits) be equal to their carrying value; recognition of the inherent funding value of these instruments is not permitted.

Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on a Recurring Basis
Held-to-Maturity Securities
Held-to-maturity securities include similar investments held in our available-for-sale securities portfolio and are valued using the same methodologies. All securities included in our held-to-maturity securities portfolio are valued using Level 2 inputs. Refer to Level 2 fair value measurements above for significant inputs used in the valuation of our held-to-maturity investment securities.
Non-Marketable Securities (Cost and Equity Method Accounting)
Non-marketable securities includes other investments (equity method accounting), venture capital and private equity fund investments (cost method accounting), and other venture capital investments (cost method accounting). Other investments (equity method accounting) includes our investment in SPD-SVB, our joint venture bank in China. At this time, the carrying value of our investment in SPD-SVB is a reasonable estimate of fair value. The fair value of the remaining other investments (equity method accounting) and the fair value of venture capital and private equity fund investments (cost method accounting) and other venture capital investments (cost method accounting) is based on financial information obtained from the investee or obtained from the fund investments’ or debt fund investments’ respective general partners. For private company investments, estimated fair value is based on consideration of a range of factors including, but not limited to, the price at which the investment was acquired, the term and nature of the investment, local market conditions, values for comparable securities, current and projected operating performance, exit strategies, and financing transactions subsequent to the acquisition of the investment. For our fund investments, we utilize the net asset value per share as obtained from the general partners of the investments. We adjust the net asset value per share for differences between our measurement date and the date of the fund investment’s net asset value by using the most recently available financial information from the investee general partner, for example December 31st, for our March 31st consolidated financial statements, adjusted for any contributions paid, distributions received from the investment, and significant fund transactions or market events during the reporting period.
Loans
The fair value of fixed and variable rate loans is estimated by discounting contractual cash flows using rates that reflect current pricing for similar loans and the projected forward yield curve. This method is not based on the exit price concept of fair value required under ASC 820, Fair Value Measurements and Disclosures.
Long-Term Deposits
The fair value of long-term time deposits is estimated by discounting the cash flows using our cost of borrowings and the projected forward yield curve over their remaining contractual term.
Long-Term Debt
The fair value of long-term debt is generally based on quoted market prices, when available, or is estimated based on calculations utilizing third-party pricing services and current market spread, price indications from reputable dealers or observable market prices of the underlying instrument(s), whichever is deemed more reliable. Also included in the estimated fair value of our 6.05% Subordinated Notes are amounts related to hedge accounting associated with the notes.
Off-Balance Sheet Financial Instruments
The fair value of net available commitments to extend credit is estimated based on the average amount we would receive or pay to execute a new agreement with identical terms and pricing, while taking into account the counterparties’ credit standing.
Letters of credit are carried at their fair value, which was equivalent to the residual premium or fee at March 31, 2016 and December 31, 2015. Commitments to extend credit and letters of credit typically result in loans with a market interest rate if funded.
The following fair value hierarchy table presents the estimated fair values of our financial instruments that are not carried at fair value at March 31, 2016 and December 31, 2015:
 
 
 
 
Estimated Fair Value
(Dollars in thousands)
 
Carrying Amount
 
Total
 
Level 1
 
Level 2
 
Level 3
March 31, 2016:
 
 
 
 
 
 
 
 
 
 
Financial assets:
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
 
$
1,868,512

 
$
1,868,512

 
$
1,868,512

 
$

 
$

Held-to-maturity securities
 
8,548,238

 
8,630,952

 

 
8,630,952

 

Non-marketable securities (cost and equity method accounting) not measured at net asset value
 
117,471

 
120,299

 

 

 
120,299

Non-marketable securities (cost and equity method accounting) measured at net asset value (1)
 
245,125

 
361,657

 

 

 

Net commercial loans
 
15,633,705

 
15,703,446

 

 

 
15,703,446

Net consumer loans
 
1,871,193

 
1,847,619

 

 

 
1,847,619

FHLB and Federal Reserve Bank stock
 
56,991

 
56,991

 

 

 
56,991

Accrued interest receivable
 
105,062

 
105,062

 

 
105,062

 

Financial liabilities:
 
 
 
 
 
 
 
 
 
 
Non-maturity deposits (2)
 
38,695,925

 
38,695,925

 
38,695,925

 

 

Time deposits
 
63,796

 
63,686

 

 
63,686

 

3.50% Senior Notes
 
346,744

 
345,506

 

 
345,506

 

5.375% Senior Notes
 
347,155

 
389,946

 

 
389,946

 

6.05% Subordinated Notes (3)
 
48,045

 
49,368

 

 
49,368

 

7.0% Junior Subordinated Debentures
 
54,626

 
53,039

 

 
53,039

 

Accrued interest payable
 
4,888

 
4,888

 

 
4,888

 

Off-balance sheet financial assets:
 
 
 
 
 
 
 
 
 
 
Commitments to extend credit
 

 
25,515

 

 

 
25,515

December 31, 2015:
 
 
 
 
 
 
 
 
 
 
Financial assets:
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
 
$
1,503,257

 
$
1,503,257

 
$
1,503,257

 
$

 
$

Held-to-maturity securities
 
8,790,963

 
8,758,622

 

 
8,758,622

 

Non-marketable securities (cost and equity method accounting) not measured at net asset value
 
114,795

 
117,172

 

 

 
117,172

Non-marketable securities (cost and equity method accounting) measured at net asset value (1)
 
250,970

 
364,799

 

 

 

Net commercial loans
 
14,763,302

 
14,811,588

 

 

 
14,811,588

Net consumer loans
 
1,761,155

 
1,737,960

 

 

 
1,737,960

FHLB and Federal Reserve Bank stock
 
56,991

 
56,991

 

 

 
56,991

Accrued interest receivable
 
107,604

 
107,604

 

 
107,604

 

Financial liabilities:
 
 
 
 
 
 
 
 
 
 
Short-term FHLB advances
 
638,000

 
638,000

 
638,000

 

 

Federal funds purchased
 
135,000

 
135,000

 
135,000

 

 

Other short-term borrowings
 
1,900

 
1,900

 
1,900

 

 

Non-maturity deposits (2)
 
39,072,297

 
39,072,297

 
39,072,297

 

 

Time deposits
 
70,479

 
70,347

 

 
70,347

 

3.50% Senior Notes
 
346,667

 
333,648

 

 
333,648

 

5.375% Senior Notes
 
347,016

 
384,216

 

 
384,216

 

6.05% Subordinated Notes (3)
 
48,350

 
49,820

 

 
49,820

 

7.0% Junior Subordinated Debentures
 
54,669

 
52,905

 

 
52,905

 

Accrued interest payable
 
12,058

 
12,058

 

 
12,058

 

Off-balance sheet financial assets:
 
 
 
 
 
 
 
 
 
 
Commitments to extend credit
 

 
26,483

 

 

 
26,483

 
 
(1)
In accordance with the accounting standard (ASU 2015-07, Fair Value Measurement (Topic 820)), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements (unaudited)" under Part I, Item 1 in this report.
(2)
Includes noninterest-bearing demand deposits, interest-bearing checking accounts, money market accounts and interest-bearing sweep deposits.
(3)
At March 31, 2016 and December 31, 2015, included in the carrying value and estimated fair value of our 6.05% Subordinated Notes was an interest rate swap valued at $2.4 million and $2.8 million, respectively, related to hedge accounting associated with the notes.

Investments in Entities that Calculate Net Asset Value Per Share
FASB guidance over certain fund investments requires that we disclose the fair value of funds, significant investment strategies of the investees, redemption features of the investees, restrictions on the ability to sell investments, estimate of the period of time over which the underlying assets are expected to be liquidated by the investee, and unfunded commitments related to the investments.
Our investments in debt funds and venture capital and private equity fund investments generally cannot be redeemed. Alternatively, we expect distributions, if any, to be received primarily through IPOs and M&A activity of the underlying assets of the fund. Subject to applicable requirements under the Volcker Rule, we do not have any plans to sell any of these fund investments. If we decide to sell these investments in the future, the investee fund’s management must approve of the buyer before the sale of the investments can be completed. The fair values of the fund investments have been estimated using the net asset value per share of the investments, adjusted for any differences between our measurement date and the date of the fund investment’s net asset value by using the most recently available financial information from the investee general partner, for example December 31st, for our March 31st consolidated financial statements, adjusted for any contributions paid, distributions received from the investment, and significant fund transactions or market events during the reporting period.
The following table is a summary of the estimated fair values of these investments and remaining unfunded commitments for each major category of these investments as of March 31, 2016:
(Dollars in thousands)
 
Carrying Amount      
 
Fair Value        
 
Unfunded Commitments      
Non-marketable securities (fair value accounting):
 
 
 
 
 
 
Venture capital and private equity fund investments (1)
 
$
145,649

 
$
145,649

 
$
6,610

Non-marketable securities (equity method accounting):
 
 
 
 
 
 
Venture capital and private equity fund investments (2)
 
83,555

 
83,555

 
4,954

Debt funds (2)
 
21,809

 
23,066

 

Other investments (2)
 
22,352

 
22,352

 
886

Non-marketable securities (cost method accounting):
 
 
 
 
 
 
Venture capital and private equity fund investments (2)
 
117,409

 
232,684

 
9,938

Total
 
$
390,774

 
$
507,306

 
$
22,388

 
 
(1)
Venture capital and private equity fund investments within non-marketable securities (fair value accounting) include investments made by our managed funds of funds and one of our direct venture funds. These investments represent investments in venture capital and private equity funds that invest primarily in U.S. and global technology and life science/healthcare companies. Included in the fair value and unfunded commitments of fund investments under fair value accounting are $103 million and $5 million, respectively, attributable to noncontrolling interests. It is estimated that we will receive distributions from the fund investments over the next 10 to 13 years, depending on the age of the funds and any potential extensions of terms of the funds.
(2)
Venture capital and private equity fund investments, debt funds, and other fund investments within non-marketable securities (equity and cost method accounting) include funds that invest in or lend money to primarily U.S. and global technology and life science/healthcare companies. It is estimated that we will receive distributions from the funds over the next 10 to 13 years, depending on the age of the funds and any potential extensions of the terms of the funds.