As provided for by accounting standards, the Company records and/or discloses financial instruments on a fair value basis. These financial assets and financial liabilities are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the assumptions used to determine fair value. These levels are: Level 1 - quoted market prices in active markets for identical assets or liabilities that a company has the ability to access at the measurement date; Level 2 - inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly; Level 3 – significant unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity. In instances where the fair value measurement is based on inputs from different levels, the level within which the entire fair value measurement will be categorized is based on the lowest level input that is significant to the fair value measurement in its entirety; this assessment of the significance of an input requires management judgment.

Disclosure of the fair value of financial instruments, whether recognized or not recognized in the consolidated balance sheet, is required for those instruments for which it is practicable to estimate that value, with the exception of certain financial instruments and all nonfinancial instruments as provided for by the accounting standards. For financial instruments recognized at fair value in the consolidated balance sheets, the fair value disclosure requirements also apply.

Fair value (i.e. the price that would be received in an orderly transaction that is not a forced liquidation or distressed sale at the measurement date), among other things, is based on exit price versus entry price, should include assumptions about risk such as nonperformance risk in liability fair values, and is a market-based measurement versus an entity-specific measurement.

The following table presents the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented:

The following table presents the changes in Level 3 assets measured at fair value on a recurring basis during the years ended December 31:

The following is a description of the valuation methodologies used by the Company for the items noted in the tables above. Where quoted market prices on securities exchanges are available, the investment is classified as Level 1. Level 1 investments primarily include exchange-traded equity securities available for sale. If quoted market prices are not available, fair value is generally determined using prices obtained from independent pricing vendors who use pricing models (with typical inputs including benchmark yields, reported trades for similar securities, issuer spreads or relationship to other benchmark quoted securities), or discounted cash flows, and are classified as Level 2. Examples of these investments include mortgage-related securities and obligations of state, county and municipals. Finally, in certain cases where there is limited activity or less transparency around inputs to the estimated fair value, investments are classified within Level 3 of the hierarchy. Examples of these include corporate debt securities. At December 31, 2016 and 2015, it was determined that carrying value was the best approximation of fair value for these Level 3 securities, based primarily on the internal analysis on the corporate debt securities.

The following table presents the Company’s collateral-dependent impaired loans and OREO measured at fair value on a nonrecurring basis as of December 31, 2016 and 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

The Company is required under accounting guidance to report the fair value of all financial instruments in the consolidated balance sheets, including those financial instruments carried at cost. The carrying amounts and estimated fair values of the Company's financial instruments at December 31, 2016 and 2015 are shown below.

Certificates of deposits in other banks: Fair values are estimated using discounted cash flow analysis based on current interest rates being offered by instruments with similar terms and represents a Level 2 measurement.

Securities AFS and other investments: Fair values for securities are based on quoted market prices on securities exchanges, when available, which is considered a Level 1 measurement. If quoted market prices are not available, fair value is generally determined using pricing models widely used in the industry, quoted market prices of securities with similar characteristics, or discounted cash flows, which is considered a Level 2 measurement, and Level 3 was deemed appropriate for auction rate securities (for which there has been no liquid market since 2008) and corporate debt securities which include trust preferred security instruments. The corporate debt securities were acquired in the Mid-Wisconsin acquisition and valued based on a discounted cash flow analysis and the underlying credit quality of the issuer. The fair value approximates the cost at acquisition. For other investments, the carrying amount of Federal Reserve Bank, Bankers Bank, Farmer Mac, and FHLB stock is a reasonably accepted fair value estimate given their restricted nature. Fair value is the redeemable (carrying) value based on the redemption provisions of the instruments which is considered a Level 2 measurement. The carrying amount of the remaining other investments (particularly common stocks of companies or other banks that are not publicly traded) approximates their fair value, determined primarily by analysis of company financial statements and recent capital issuances of the respective companies or banks, if any and represents a Level 3 measurement.

Loans held for sale: The fair value estimation process for the loans held for sale portfolio is segregated by loan type. The estimated fair value was based on what secondary markets are currently offering for portfolios with similar characteristics and represents a Level 2 measurement.

Loans, net: For variable-rate loans that reprice frequently and with no significant change in credit risk or other optionality, fair values are based on carrying values. Fair values for all other loans are estimated by discounting contractual cash flows using estimated market discount rates, which reflect the credit and interest rate risk inherent in the loan. Collateral-dependent impaired loans are included in loans, net. The fair value of loans is considered to be a Level 3 measurement due to internally developed discounted cash flow measurements.

MSR asset: To estimate the fair value of the MSR asset, the underlying serviced loan pools are stratified by interest rate tranche and term of the loan, and a valuation model is used to calculate the present value of expected future cash flows for each stratum. When the carrying value of the MSR asset related to a stratum exceeds its fair value, the stratum is recorded at fair value, generally through a valuation allowance. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as costs to service, a discount rate, ancillary income, default rates and losses, and prepayment speeds. Although some of these assumptions are based on observable market data, other assumptions are based on unobservable estimates of what market participants would use to measure fair value. As a result, the fair value measurement of mortgage servicing rights is considered a Level 3 measurement and represents an income approach to fair value.

Deposits: The fair value of deposits with no stated maturity (such as demand deposits, savings, interest and non-interest checking, and money market accounts) is, by definition, equal to the amount payable on demand at the reporting date. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered in the market place on certificates of similar remaining maturities. Use of internal discounted cash flows provides a Level 3 fair value measurement.

Notes payable: The fair value of the FHLB advances is obtained from the FHLB which uses a discounted cash flow analysis based on current market rates of similar maturity debt securities and represents a Level 2 measurement. The fair values of remaining notes payable are estimated using discounted cash flow analysis based on current interest rates being offered by instruments with similar terms and credit quality which represents a Level 2 measurement.

Junior subordinated debentures: The fair values of junior subordinated debentures are estimated based on an evaluation of current interest rates being offered by instruments with similar terms and credit quality. Since the market for these instruments is limited, the internal evaluation represents a Level 3 measurement.

Subordinated notes: The fair values of subordinated notes are estimated based on an evaluation of current interest rates being offered by instruments with similar terms and credit quality. Since the market for these instruments is limited, the internal evaluation represents a Level 3 measurement.

Off-balance-sheet instruments: The estimated fair value of letters of credit at December 31, 2016 and 2015 was insignificant. Loan commitments on which the committed interest rate is less than the current market rate are also insignificant at December 31, 2016 and 2015.