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Note 11 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

At December 31, 2021

 
  

Fair Value

  

Quoted Prices in Active Markets for Identical Assets
(Level 1)

  

Significant Other Observable Inputs
(Level 2)

  

Significant Unobservable Inputs
(Level 3) (1)

 
  

(In thousands)

 

Debt securities available for sale

                

Agency residential mortgage-backed securities (MBS)

 $411,726  $-  $411,726  $- 

Securities of U.S. Government entities

  119   -   119   - 

Obligations of states and political subdivisions

  93,920   -   93,920   - 

Corporate securities

  2,746,735   -   2,746,735   - 

Collateralized loan obligations

  1,386,355   -   1,386,355   - 

Total debt securities available for sale

 $4,638,855  $-  $4,638,855  $- 
  

At December 31, 2020

 
  

Fair Value

  

Quoted Prices in Active Markets for Identical Assets
(Level 1)

  

Significant Other Observable Inputs
(Level 2)

  

Significant Unobservable Inputs
(Level 3) (1)

 
  

(In thousands)

 

Debt securities available for sale

                

Agency residential MBS

 $652,952  $-  $652,952  $- 

Securities of U.S. Government entities

  154   -   154   - 

Obligations of states and political subdivisions

  111,010   -   111,010   - 

Corporate securities

  2,117,978   -   2,117,978   - 

Commercial paper

  24,990   -   24,990   - 

Collateralized loan obligations

  1,156,101   -   1,156,101   - 

Total debt securities available for sale

 $4,063,185  $-  $4,063,185  $- 
Fair Value Measurements, Nonrecurring [Table Text Block]
                  

For the

 
                  

Year Ended

 
  

At December 31, 2021

  

December 31, 2021

 
  

Carrying Value

  

Level 1

  

Level 2

  

Level 3

  

Total Losses

 
  

(In thousands)

 

Loans:

                    

Commercial real estate

 $225  $-  $-  $225  $- 

Residential real estate

  172   -   -   172   - 

Total assets measured at fair value on a nonrecurring basis

 $397  $-  $-  $397  $- 
                  

For the

 
                  

Year Ended

 
  

At December 31, 2020

  

December 31, 2020

 
  

Carrying Value

  

Level 1

  

Level 2

  

Level 3

  

Total Losses

 
  

(In thousands)

 

Loans:

                    

Commercial

 $5,270  $-  $-  $5,270  $- 

Commercial real estate

  3,710   -   -   3,710   - 

Residential real estate

  181   -   -   181   - 

Total assets measured at fair value on a nonrecurring basis

 $9,161  $-  $-  $9,161  $- 
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

At December 31, 2021

 
  

Carrying Amount

  

Estimated Fair Value

  

Quoted Prices in Active Markets for Identical Assets
(Level 1)

  

Significant Other Observable Inputs
(Level 2 )

  

Significant Unobservable Inputs
(Level 3 )

 

Financial Assets:

 

(In thousands)

 

Cash and due from banks

 $1,132,085  $1,132,085  $1,132,085  $-  $- 

Debt securities held to maturity

  306,396   312,562   -   312,562   - 

Loans

  1,044,612   1,059,072   -   -   1,059,072 
                     

Financial Liabilities:

                    

Deposits

 $6,413,956  $6,413,244  $-  $6,270,344  $142,900 

Short-term borrowed funds

  146,246   146,246   -   146,246   - 
  

At December 31, 2020

 
  

Carrying Amount

  

Estimated Fair Value

  

Quoted Prices in Active Markets for Identical Assets
(Level 1)

  

Significant Other Observable Inputs
(Level 2 )

  

Significant Unobservable Inputs
(Level 3 )

 

Financial Assets:

 

(In thousands)

 

Cash and due from banks

 $621,275  $621,275  $621,275  $-  $- 

Debt securities held to maturity

  515,589   529,678   -   529,678   - 

Loans

  1,232,389   1,290,938   -   -   1,290,938 
                     

Financial Liabilities:

                    

Deposits

 $5,687,979  $5,688,049  $-  $5,531,590  $156,459 

Short-term borrowed funds

  102,545   102,545   -   102,545   -