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Fair Value Measurements
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements [Text Block] Fair Value Measurements
Fair value is defined by applicable accounting guidance as the price to sell an asset or transfer a liability in an orderly transaction between market participants in the principal market for the given asset or liability at the measurement date based on market conditions at that date. An orderly transaction assumes exposure to the market for a customary period for marketing activities prior to the measurement date and not a forced liquidation or distressed sale. Certain assets and liabilities are recorded in the Company’s financial statements at fair value. Some are recorded on a recurring basis and some on a non-recurring basis.

For some assets and liabilities, observable market transactions and market information might be available. For other assets and liabilities, observable market transactions and market information might not be available. A hierarchy for fair value has been established which categorizes into three levels the inputs to valuation techniques used to measure fair value. The three levels are as follows:

Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) - fair value is based on unadjusted quoted prices in active markets for identical assets or liabilities.

Significant Other Observable Inputs (Level 2) - fair value is based on significant other observable inputs which are generally determined based on a single price for each financial instrument provided to us by an applicable third-party pricing service and is based on one or more of the following:

Quoted prices for similar, but not identical, assets or liabilities in active markets;
Quoted prices for identical or similar assets or liabilities in inactive markets;
Inputs other than quoted prices that are observable, such as interest rate and yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates;
Other inputs derived from or corroborated by observable market inputs.

Significant Unobservable Inputs (Level 3) - fair value is based upon model-based valuation techniques for which at least one significant assumption is not observable in the market.

Transfers between levels are recognized as of the end of the reporting period. There were no transfers in or out of quoted prices in active markets for identical instruments to significant other observable inputs or significant unobservable inputs during the year ended December 31, 2021 and 2020, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the year ended December 31, 2021 and 2020 are included in the summary of changes in recurring fair values measured using unobservable inputs.

The underlying methods used by the third-party pricing services are considered in determining the primary inputs used to determine fair values. Management has evaluated the methodologies employed by the third-party pricing services by comparing the price provided by the pricing service with other sources, including brokers' quotes, sales or purchases of similar instruments and discounted cash flows to establish a basis for reliance on the pricing service values. Significant differences between the pricing service provided value and other sources are discussed with the pricing service to understand the basis for their values. Based on all observable inputs, management may adjust prices obtained from third-party pricing services to more appropriately reflect the prices that would be received to sell assets or paid to transfer liabilities in orderly transactions in the current market. No significant adjustments were made to prices provided by third-party pricing services at December 31, 2021 and 2020.
Assets and Liabilities Measured at Fair Value on a Recurring Basis

The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2021 (in thousands):
 TotalQuoted Prices in Active Markets for Identical InstrumentsSignificant Other Observable InputsSignificant Unobservable Inputs
Assets:    
Trading securities:
U.S. government securities$23,610 $4,999 $18,611 $ 
Residential agency mortgage-backed securities9,068,900  9,068,900  
Municipal securities25,783  25,783  
Other trading securities18,520  18,520  
Total trading securities9,136,813 4,999 9,131,814  
Available for sale securities:    
U.S. Treasury1,000 1,000   
Municipal securities508,365  508,365  
Residential agency mortgage-backed securities8,006,616  8,006,616  
Residential non-agency mortgage-backed securities24,339  24,339  
Commercial agency mortgage-backed securities4,617,025  4,617,025  
Other debt securities472   472 
Total available for sale securities13,157,817 1,000 13,156,345 472 
Fair value option securities — Residential agency mortgage-backed securities43,770  43,770  
Residential mortgage loans held for sale1
192,295  185,969 6,326 
Mortgage servicing rights, net2
163,198   163,198 
Derivative contracts, net of cash margin3
1,097,297 8,331 1,088,966  
Liabilities: 
Derivative contracts, net of cash margin3
275,625  275,625  
1Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 95.07% of the unpaid principal balance.
2A 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 7, Mortgage Banking Activities.
3See 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 derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded energy derivative contracts, fully offset by cash margin.
The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2020 (in thousands):
 TotalQuoted Prices in Active Markets for Identical InstrumentsSignificant Other Observable InputsSignificant Unobservable Inputs
Assets:    
Trading securities:
U.S. government securities$9,183 $4,999 $4,184 $— 
Residential agency mortgage-backed securities4,669,148 — 4,669,148 — 
Municipal securities19,172 — 19,172 — 
Other trading securities10,472 — 10,472 — 
Total trading securities4,707,975 4,999 4,702,976 — 
Available for sale securities:    
U.S. Treasury508 508 — — 
Municipal securities167,979 — 167,979 — 
Residential agency mortgage-backed securities9,340,471 — 9,340,471 — 
Residential non-agency mortgage-backed securities32,770 — 32,770 — 
Commercial agency mortgage-backed securities3,508,465 — 3,508,465 — 
Other debt securities472 — — 472 
Total available for sale securities13,050,665 508 13,049,685 472 
Fair value option securities — Residential agency mortgage-backed securities114,982 — 114,982 — 
Residential mortgage loans held for sale1
252,316 — 245,299 7,017 
Mortgage servicing rights, net2
101,172 — — 101,172 
Derivative contracts, net of cash margin3
810,688 10,780 799,908 — 
Liabilities: 
Derivative contracts, net of cash margin3
405,779 — 405,779 — 
1Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance.
2A 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 7, Mortgage Banking Activities.
3See 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 derivative contracts, 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, energy and agricultural contracts, fully offset by cash margin.
Following is a description of the Company's valuation methodologies used for assets and liabilities measured on a recurring basis:
Securities
The fair values of trading, available for sale and fair value option securities are based on quoted prices for identical instruments in active markets, when available. If quoted prices for identical instruments are not available, fair values are based on significant other observable inputs such as quoted prices of comparable instruments or interest rates and credit spreads, yield curves, volatilities, prepayment speeds and loss severities.

The fair value of certain available for sale and held-to-maturity municipal and other debt securities may be based on significant unobservable inputs. These significant unobservable inputs include limited observed trades, projected cash flows, current credit rating of the issuers and, when applicable, the insurers of the debt and observed trades of similar debt. Discount rates are primarily based on reference to interest rate spreads on comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies adjusted for a lack of trading volume. Significant unobservable inputs are developed by investment securities professionals involved in the active trading of similar securities. A summary of significant inputs used to value these securities follows. A management committee composed of senior members from the Company's Capital Markets, Risk Management and Finance departments assess the appropriateness of these inputs quarterly.

Derivatives

All derivative instruments are carried on the balance sheet at fair value. Fair values for exchange-traded contracts are based on quoted prices. Fair values for over-the-counter interest rate, commodity and foreign exchange contracts are based on valuations provided either by third-party dealers in the contracts, quotes provided by independent pricing services, or a third-party provided pricing model that uses significant other observable market inputs.

Credit risk is considered in determining the fair value of derivative instruments. Management determines fair value adjustments based on various risk factors including but not limited to counterparty credit rating or equivalent loan grading, derivative contract notional size, price volatility of the underlying commodity, duration of the derivative contracts and expected loss severity. Expected loss severity is based on historical losses for similarly risk graded commercial loan customers. Decreases in counterparty credit rating or grading and increases in price volatility and expected loss severity all tend to increase the credit quality adjustment which reduces the fair value of asset contracts.

We also consider our own credit risk in determining the fair value of derivative contracts. Changes in our credit rating would affect the fair value of our derivative liabilities. In the event of a credit downgrade, the fair value of our derivative liabilities would increase.
Residential Mortgage Loans Held for Sale
Residential mortgage loans held for sale are carried on the balance sheet at fair value. The fair values of conforming residential mortgage loans held for sale are based upon quoted market prices of such loans sold in securitization transactions, including related unfunded loan commitments. The fair value of mortgage loans that are unable to be sold to U.S. government agencies is determined using quoted prices of loans that are sold in securitization transactions with a liquidity discount applied.
Fair Value of Assets and Liabilities Measured on a Non-Recurring Basis

Assets measured at fair value on a non-recurring basis include pension plan assets, which are based on quoted prices in active markets for identical instruments, collateral for certain nonaccruing loans and real property and other assets acquired to satisfy loans, which are based primarily on comparisons to completed sales of similar assets.

The following represents the carrying value of assets measured at fair value on a non-recurring basis and related losses recorded during the year. The carrying value represents only those assets with the balance sheet date for which the fair value was adjusted during the year:
 Carrying Value at December 31, 2021Fair Value Adjustments for the Year Ended December 31, 2021 Recognized In:
 Quoted Prices
in Active Markets for Identical Instruments
Significant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Gross charge-offs against allowance for loan lossesOther gains (losses), net
Nonaccruing loans$ $808 $1,990 $2,087 $ 
Real estate and other repossessed assets
 1,706   (150)
 
 Carrying Value at December 31, 2020Fair Value Adjustments for the Year Ended December 31, 2020 Recognized In:
 Quoted Prices
in Active Markets for Identical Instruments
Significant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Gross charge-offs against allowance for loan lossesOther gains (losses), net
Nonaccruing loans$— $801 $20,423 $39,299 $— 
Real estate and other repossessed assets— 18,188 2,842 — 4,602 

The fair value of collateral-dependent nonaccruing loans and real estate and other repossessed assets and the related fair value adjustments are generally based on unadjusted third-party appraisals. Our appraisal review policies require appraised values to be supported by observed inputs derived principally from or corroborated by observable market data. Appraisals that are not based on observable inputs or that require significant adjustments or fair value measurements that are not based on third-party appraisals are considered to be based on significant unobservable inputs. Non-recurring fair value measurements of collateral-dependent nonaccruing loans and real estate and other repossessed assets based on significant unobservable inputs are generally due to estimates of current fair values between appraisal dates. Significant unobservable inputs include listing prices for comparable assets, uncorroborated expert opinions or management's knowledge of the collateral or industry. Non-recurring fair value measurements of collateral dependent loans secured by mineral rights are generally determined by our internal staff of engineers on projected cash flows under current market conditions and are based on significant unobservable inputs. Projected cash flows are discounted according to risk characteristics of the underlying oil and gas properties. Assets are evaluated to demonstrate with reasonable certainty that crude oil, natural gas and natural gas liquids can be recovered from known oil and gas reservoirs under existing economic and operating conditions at current prices with existing conventional equipment, operating methods and costs. Significant unobservable inputs are developed by asset management and workout professionals and approved by senior Credit Administration executives.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2021 follows (in thousands):
Quantitative Information about Level 3 Non-recurring Fair Value Measurements
Fair ValueValuation Technique(s)Significant Unobservable InputRange
(Weighted Average)
Nonaccruing loans$1,990 Discounted cash flowsManagement knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs
16% - 97% (37%)1
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 December 31, 2020 follows (in thousands):
Quantitative Information about Level 3 Non-recurring Fair Value Measurements
Fair ValueValuation Technique(s)Significant Unobservable InputRange
(Weighted Average)
Nonaccruing loans$20,423 Discounted cash flowsManagement knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs
1% - 91% (23%)1
Real estate and other repossessed assets2,842 Discounted cash flowsManagement knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costsN/A
1    Represents fair value as a percentage of the unpaid principal balance.

The fair value of pension plan assets was approximately $39 million at December 31, 2021 and $38 million at December 31, 2020, determined by significant other observable inputs. Fair value adjustments of pension plan assets along with changes in the projected benefit obligation are recognized in other comprehensive income.
Fair Value of Financial Instruments

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 (dollars in thousands):
December 31, 2021
Carrying
Value
Estimated Fair ValueQuoted 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$712,067 $712,067 $712,067 $ $ 
Interest-bearing cash and cash equivalents2,125,343 2,125,343 2,125,343   
Trading securities:
U.S. government securities23,610 23,610 4,999 18,611  
Residential agency mortgage-backed securities
9,068,900 9,068,900  9,068,900  
Municipal securities25,783 25,783  25,783  
Other trading securities18,520 18,520  18,520  
Total trading securities9,136,813 9,136,813 4,999 9,131,814  
Investment securities:   
Municipal securities203,772 223,609  57,698 165,911 
Residential agency mortgage-backed securities
6,939 7,500  7,500  
Other debt securities288 286  286  
Total investment securities210,999 231,395  65,484 165,911 
Allowance for credit losses(555)    
Investment securities, net of allowance210,444 231,395  65,484 165,911 
Available for sale securities:   
U.S. Treasury1,000 1,000 1,000   
Municipal securities508,365 508,365  508,365  
Residential agency mortgage-backed securities
8,006,616 8,006,616  8,006,616  
Residential non-agency mortgage-backed securities
24,339 24,339  24,339  
Commercial agency mortgage-backed securities
4,617,025 4,617,025  4,617,025  
Other debt securities472 472   472 
Total available for sale securities13,157,817 13,157,817 1,000 13,156,345 472 
Fair value option securities — Residential agency mortgage-backed securities43,770 43,770  43,770  
Residential mortgage loans held for sale192,295 192,295  185,969 6,326 
Loans:  
Commercial12,506,465 12,395,664   12,395,664 
Commercial real estate3,831,325 3,786,767   3,786,767 
Paycheck protection program276,341 269,912   269,912 
Loans to individuals3,591,549 3,586,878   3,586,878 
Total loans20,205,680 20,039,221   20,039,221 
Allowance for loan losses(256,421)    
Loans, net of allowance19,949,259 20,039,221   20,039,221 
Mortgage servicing rights163,198 163,198   163,198 
Derivative instruments with positive fair value, net of cash margin
1,097,297 1,097,297 8,331 1,088,966  
Deposits with no stated maturity39,537,731 39,537,731   39,537,731 
Time deposits1,704,328 1,703,886   1,703,886 
Other borrowed funds2,363,202 2,360,746   2,360,746 
Subordinated debentures131,226 141,761  141,761  
Derivative instruments with negative fair value, net of cash margin
275,625 275,625  275,625  
December 31, 2020
Carrying
Value
Estimated Fair ValueQuoted 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$798,757 $798,757 $798,757 $— $— 
Interest-bearing cash and cash equivalents381,816 381,816 381,816 — — 
Trading securities:
U.S. government securities9,183 9,183 4,999 4,184 — 
Residential agency mortgage-backed securities
4,669,148 4,669,148 — 4,669,148 — 
Municipal securities19,172 19,172 — 19,172 — 
Other trading securities10,472 10,472 — 10,472 — 
Total trading securities4,707,975 4,707,975 4,999 4,702,976 — 
Investment securities:   
Municipal securities229,245 255,270 — 69,404 185,866 
Residential agency mortgage-backed securities
8,913 9,790 — 9,790 — 
Other debt securities7,373 7,371 — 7,371 — 
Total investment securities245,531 272,431 — 86,565 185,866 
Allowance for credit losses(688)— — — — 
Investment securities, net of allowance244,843 272,431 — 86,565 185,866 
Available for sale securities:   
U.S. Treasury securities508 508 508 — — 
Municipal securities167,979 167,979 — 167,979 — 
Residential agency mortgage-backed securities
9,340,471 9,340,471 — 9,340,471 — 
Residential non-agency mortgage-backed securities
32,770 32,770 — 32,770 — 
Commercial agency mortgage-backed securities
3,508,465 3,508,465 — 3,508,465 — 
Other debt securities472 472 — — 472 
Total available for sale securities13,050,665 13,050,665 508 13,049,685 472 
Fair value option securities — Residential agency mortgage-backed securities114,982 114,982 — 114,982 — 
Residential mortgage loans held for sale252,316 252,316 — 245,299 7,017 
Loans:
Commercial13,077,535 13,003,383 — — 13,003,383 
Commercial real estate4,698,538 4,649,763 — — 4,649,763 
Paycheck protection program1,682,310 1,669,461 — — 1,669,461 
Loans to individuals3,549,137 3,563,199 — — 3,563,199 
Total loans23,007,520 22,885,806 — — 22,885,806 
Allowance for loan losses(388,640)— — — — 
Loans, net of allowance22,618,880 22,885,806 — — 22,885,806 
Mortgage servicing rights101,172 101,172 — — 101,172 
Derivative instruments with positive fair value, net of cash margin
810,688 810,688 10,780 799,908 — 
Deposits with no stated maturity34,176,752 34,176,752 — — 34,176,752 
Time deposits1,967,128 1,976,936 — — 1,976,936 
Other borrowed funds3,545,356 3,542,489 — — 3,542,489 
Subordinated debentures276,005 269,544 — 269,544 — 
Derivative instruments with negative fair value, net of cash margin
405,779 405,779 — 405,779 — 

Because no market exists for certain of these financial instruments and management does not intend to sell these financial instruments, the fair values shown in the tables above may not represent values at which the respective financial instruments could be sold individually or in the aggregate at the given reporting date.
Fair Value Election

As more fully disclosed in Note 2 and Note 7 to the Consolidated Financial Statements, the Company has elected to carry all securities held as economic hedges against changes in the fair value of mortgage servicing rights and all residential mortgage loans originated for sale at fair value. Changes in the fair value of these financial instruments are recognized in earnings.