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Fair value of financial instruments (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The following table contains the estimated fair values and the related carrying values of the Company's financial instruments. Items which are not financial instruments are not included.
 
 Fair Value
June 30, 2020Carrying amountLevel 1Level 2Level 3Total
Financial assets:     
Cash and cash equivalents$717,592  $717,592  $—  $—  $717,592  
Investment securities751,767  —  751,767  —  751,767  
Loans, net4,713,894  —  —  4,755,504  4,755,504  
Loans held for sale435,479  —  435,479  —  435,479  
Interest receivable26,587  45  3,533  23,009  26,587  
Mortgage servicing rights60,508  —  —  60,508  60,508  
Derivatives80,544  —  80,544  —  80,544  
Financial liabilities: 
Deposits: 
Without stated maturities$4,761,306  $4,761,306  $—  $—  $4,761,306  
With stated maturities1,191,495  —  1,204,271  —  1,204,271  
Securities sold under agreement to
repurchase and federal funds sold
32,732  32,732  —  —  32,732  
Federal Home Loan Bank advances250,000  —  258,901  —  258,901  
Subordinated debt30,930  —  23,396  —  23,396  
Other borrowings15,000  —  15,000  —  15,000  
Interest payable7,079  207  6,872  —  7,079  
Derivatives50,069  —  50,069  —  50,069  
 
 Fair Value
December 31, 2019Carrying amountLevel 1Level 2Level 3Total
Financial assets:     
Cash and cash equivalents$232,681  $232,681  $—  $—  $232,681  
Investment securities691,676  —  691,676  —  691,676  
Loans, net4,378,503  —  —  4,363,903  4,363,903  
Loans held for sale262,518  —  262,518  —  262,518  
Interest receivable17,083  —  3,282  13,801  17,083  
Mortgage servicing rights75,521  —  —  75,521  75,521  
Derivatives21,981  —  21,981  —  21,981  
Financial liabilities: 
Deposits: 
Without stated maturities$3,743,085  $3,743,085  $—  $—  $3,743,085  
With stated maturities1,191,853  —  1,200,145  —  1,200,145  
Securities sold under agreement to
repurchase and federal funds sold
23,745  23,745  —  —  23,745  
Federal Home Loan Bank advances250,000  —  250,213  —  250,213  
Subordinated debt30,930  —  29,706  —  29,706  
Interest payable6,465  376  6,089  —  6,465  
Derivatives17,933  —  17,933  —  17,933  
Balances and Levels of Assets Measured at Fair Value on Recurring Basis
The balances and levels of the assets measured at fair value on a recurring basis at June 30, 2020 are presented in the following table:
June 30, 2020Quoted prices
in active
markets for
identical assets
(liabilities)
(level 1)
Significant
other
observable
inputs
(level 2)
Significant
unobservable
inputs
(level 3)
Total
Recurring valuations:    
Financial assets:     
Available-for-sale securities:    
U.S. government agency securities$—  $3,024  $—  $3,024  
Mortgage-backed securities—  454,606  —  454,606  
Municipals, tax-exempt—  266,052  —  266,052  
Treasury securities—  22,771  —  22,771  
Corporate securities—  985  —  985  
Equity securities—  4,329  —  4,329  
Total$—  $751,767  $—  $751,767  
Loans held for sale$—  $435,479  $—  $435,479  
Mortgage servicing rights—  —  60,508  60,508  
Derivatives—  80,544  —  80,544  
Financial Liabilities:
Derivatives—  50,069  —  50,069  
The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2019 are presented in the following table: 
At December 31, 2019
Quoted prices
in active
markets for
identical assets
(liabilities)
(level 1)
Significant
other
observable
inputs
(level 2)
Significant unobservable
inputs
(level 3)
Total
Recurring valuations:    
Financial assets:     
Available-for-sale securities:    
Mortgage-backed securities$—  $490,676  $—  $490,676  
Municipals, tax-exempt—  189,235  —  189,235  
Treasury securities—  7,448  —  7,448  
Corporate securities—  1,022  —  1,022  
Equity securities—  3,295  —  3,295  
Total$—  $691,676  $—  $691,676  
Loans held for sale$—  $262,518  $—  $262,518  
Mortgage servicing rights—  —  75,521  75,521  
Derivatives—  21,981  —  21,981  
Financial Liabilities:
Derivatives—  17,933  —  17,933  
Balances and Levels of Assets Measured at Fair Value on Non-recurring Basis
The balances and levels of the assets measured at fair value on a non-recurring basis at June 30, 2020 are presented in the following table: 
At June 30, 2020Quoted prices
in active
markets for
identical assets
(liabilities)
(level 1)
Significant
other
observable
inputs
(level 2)
Significant
unobservable
inputs
(level 3)
Total
Non-recurring valuations:    
Financial assets:    
Other real estate owned$—  $—  $3,407  $3,407  
Collateral dependent loans:
Commercial and industrial$—  $—  $3,062  $3,062  
Residential real estate:
1-4 family mortgage—  —  100  100  
Residential line of credit—  —  471  311  
Commercial real estate:
Owner occupied—  —  1,461  1,461  
Non-owner occupied—  —  8,500  8,500  
Consumer and other—  —  336  336  
Total collateral dependent loans$—  $—  $15,162  $15,162  
The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2019 are presented in the following table: 
At December 31, 2019Quoted prices
in active
markets for
identical assets
(liabilities)
(level 1)
Significant
other observable inputs
(level 2)
Significant unobservable
inputs
(level 3)
Total
Non-recurring valuations:    
Financial assets:    
Other real estate owned$—  $—  $9,774  $9,774  
Impaired Loans(1):
Commercial and industrial$—  $—  $6,481  $6,481  
Residential real estate:
1-4 family mortgage—  —  378  378  
Residential line of credit—  —  321  321  
Commercial real estate: 
Owner occupied—  —  951  951  
Non-owner occupied—  —  2,560  2,560  
Total$—  $—  $10,691  $10,691  
(1) Includes both impaired non-purchased loans and collateral-dependent PCI loans.
Information About Significant Unobservable Inputs (Level 3) Used in Valuation of Assets Measured at Fair Value on Nonrecurring Basis
The following table presents information as of June 30, 2020 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis:
Financial instrument
Fair Value
Valuation techniqueSignificant Unobservable inputsRange of
inputs
Collateral dependent loans$15,162  Valuation of collateralDiscount for comparable sales
0%-30%
Other real estate owned$3,407  Appraised value of property less costs to sellDiscount for costs to sell
0%-15%
The following table presents information as of December 31, 2019 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis:
Financial instrument
Fair Value
Valuation techniqueSignificant Unobservable inputsRange of
inputs
Impaired loans(1)
$10,691  Valuation of collateralDiscount for comparable sales
0%-30%
Other real estate owned$9,774  Appraised value of property less costs to sellDiscount for costs to sell
0%-15%
(1) Includes both impaired non-purchased loans and collateral-dependent PCI loans.
Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value
The following table summarizes the differences between the fair value and the principal balance for loans held for sale measured at fair value as of June 30, 2020 and December 31, 2019: 
June 30, 2020Aggregate
fair value
Aggregate
Unpaid
Principal
Balance
Difference
Mortgage loans held for sale measured at fair value$435,479  $413,963  $21,516  
Past due loans of 90 days or more—  —  —  
Nonaccrual loans—  —  —  
December 31, 2019 
Mortgage loans held for sale measured at fair value$262,518  $254,868  $7,650  
Past due loans of 90 days or more—  —  —  
Nonaccrual loans—  —  —