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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
The following table sets forth the Company’s financial assets by level within the fair value hierarchy that were measured at fair value on a recurring basis as of December 31, 2021 and 2020. 

  Fair Value Measurements
(In thousands)Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable Inputs
(Level 3)
December 31, 2021    
Available-for-sale securities    
U.S. Treasury$300 $300 $— $— 
U.S. Government agencies364,641 — 364,641 — 
Mortgage-backed securities4,448,616 — 4,448,616 — 
State and political subdivisions1,819,658 — 1,819,658 — 
Other securities480,330 — 480,330 — 
Mortgage loans held for sale36,356 — — 36,356 
Derivative asset25,852 — 25,852 — 
Derivative liability(15,443)— (15,443)— 
December 31, 2020    
Available-for-sale securities    
U.S. Government agencies477,237 — 477,237 — 
Mortgage-backed securities1,394,936 — 1,394,936 — 
State and political subdivisions1,470,723 — 1,470,723 — 
Other securities130,702 — 130,702 — 
Mortgage loans held for sale137,378 — — 137,378 
Derivative asset35,846 — 35,846 — 
Other liabilities held for sale(154,620)— — (154,620)
Derivative liability(36,141)— (36,141)— 
Fair Value, Assets Measured on Nonrecurring
The following table sets forth the Company’s financial assets by level within the fair value hierarchy that were measured at fair value on a nonrecurring basis as of December 31, 2021 and 2020.
 
  Fair Value Measurements Using
(In thousands)Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable Inputs
(Level 3)
December 31, 2021    
Individually assessed loans (1) (2) (collateral-dependent)
$47,089 $— $— $47,089 
Foreclosed assets and other real estate owned (1)
4,875 — — 4,875 
December 31, 2020    
Individually assessed loans (1) (2) (collateral-dependent)
$66,209 $— $— $66,209 
Foreclosed assets and other real estate owned (1)
17,074 — — 17,074 
______________________
(1)    These amounts represent the resulting carrying amounts on the consolidated balance sheets for collateral-dependent loans and foreclosed assets and other real estate owned for which fair value re-measurements took place during the period.
(2)    Identified reserves of $4,214,000 and $13,725,000 were related to collateral-dependent loans for which fair value re-measurements took place during the years ended December 31, 2021 and 2020, respectively.
Fair Value, by Balance Sheet Grouping
The estimated fair values, and related carrying amounts, of the Company’s financial instruments are as follows: 
 CarryingFair Value Measurements
(In thousands)AmountLevel 1Level 2Level 3Total
December 31, 2021     
Financial assets:     
Cash and cash equivalents$1,650,653 $1,650,653 $— $— $1,650,653 
Interest bearing balances due from banks - time1,882 — 1,882 — 1,882 
Held-to-maturity securities, net1,529,221 — 1,517,378 — 1,517,378 
Interest receivable72,990 — 72,990 — 72,990 
Loans, net11,807,171 — — 11,922,735 11,922,735 
Financial liabilities:     
Non-interest bearing transaction accounts5,325,318 — 5,325,318 — 5,325,318 
Interest bearing transaction accounts and savings deposits
11,588,770 — 11,588,770 — 11,588,770 
Time deposits2,452,460 — — 2,451,055 2,451,055 
Federal funds purchased and securities sold under agreements to repurchase
185,403 — 185,403 — 185,403 
Other borrowings1,337,973 — 1,393,711 — 1,393,711 
Subordinated notes and debentures384,131 — 394,464 — 394,464 
Interest payable6,759 — 6,759 — 6,759 
December 31, 2020     
Financial assets:     
Cash and cash equivalents$3,472,152 $3,472,152 $— $— $3,472,152 
Interest bearing balances due from banks - time1,579 — 1,579 — 1,579 
Held-to-maturity securities, net333,031 — 341,925 — 341,925 
Interest receivable72,597 — 72,597 — 72,597 
Loans, net12,662,847 — — 12,736,991 12,736,991 
Financial liabilities:     
Non-interest bearing transaction accounts4,482,091 — 4,482,091 — 4,482,091 
Interest bearing transaction accounts and savings deposits
9,672,608 — 9,672,608 — 9,672,608 
Time deposits2,832,327 — — 2,848,621 2,848,621 
Federal funds purchased and securities sold under agreements to repurchase
299,111 — 299,111 — 299,111 
Other borrowings1,342,067 — 1,448,625 — 1,448,625 
Subordinated debentures382,874 — 398,827 — 398,827 
Interest payable8,887 — 8,887 — 8,887