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Note 21 - Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value Measurements at December 31, 2023 Using

 
  

Quoted Prices in

             
  

Active Markets

  

Significant Other

  

Significant

     
  

for Identical

  

Observable Inputs

  

Unobservable

     
  

Assets (Level 1)

  

(Level 2)

  

Inputs (Level 3)

  

Total

 

 

 

(In Thousands)

 
Assets Measured on a Recurring Basis:   

Available-for-sale debt securities:

                

U.S. Treasury securities

 $340,807  $-  $-  $340,807 

Mortgage-backed securities

  -   215,485   -   215,485 

State and municipal securities

  -   10,223   -   10,223 

Corporate debt

  -   326,808   6,860   333,668 

Total available-for-sale debt securities

  340,807   552,516   6,860   900,183 

Total assets at fair value

 $340,807  $552,516  $6,860  $900,183 
  

Fair Value Measurements at December 31, 2022 Using

 
  

Quoted Prices in

             
  

Active Markets

  

Significant Other

  

Significant

     
  

for Identical

  

Observable Inputs

  

Unobservable

     
  

Assets (Level 1)

  

(Level 2)

  

Inputs (Level 3)

  

Total

 

 

 

(In Thousands)

 
Assets Measured on a Recurring Basis:   

Available-for-sale debt securities:

                

U.S. Treasury securities

 $2,969  $-  $-  $2,969 

Government agency securities

  -   9   -   9 

Mortgage-backed securities

  -   249,703   -   249,703 

State and municipal securities

  -   13,609   -   13,609 

Corporate debt

  -   367,665   10,860   378,525 

Total available-for-sale debt securities

  2,969   630,986   10,860   644,815 

Interest rate cap derivative

  -   4,201   -   4,201 

Total assets at fair value

 $2,969  $635,187  $10,860  $649,016 
Fair Value Measurements, Nonrecurring [Table Text Block]
  

Fair Value Measurements at December 31, 2023 Using

 
  

Quoted Prices in

             
  

Active Markets

  

Significant Other

  

Significant

     
  

for Identical

  

Observable

  

Unobservable

     
  

Assets (Level 1)

  

Inputs (Level 2)

  

Inputs (Level 3)

  

Total

 

 

 

(In Thousands)

 
Assets Measured on a Nonrecurring Basis:   

Loans individually evaluated

 $-  $-  $70,735  $70,735 

Other real estate owned and repossessed assets

  -   -   995   995 

Total assets at fair value

 $-  $-  $71,730  $71,730 
  

Fair Value Measurements at December 31, 2022 Using

 
  

Quoted Prices in

             
  

Active Markets

  

Significant Other

  

Significant

     
  

for Identical

  

Observable

  

Unobservable

     
  

Assets (Level 1)

  

Inputs (Level 2)

  

Inputs (Level 3)

  

Total

 

 

 

(In Thousands)

 
Assets Measured on a Nonrecurring Basis:   

Loans individually evaluated

 $-  $-  $73,017  $73,017 

Other real estate owned and repossessed assets

  -   -   248   248 

Total assets at fair value

 $-  $-  $73,265  $73,265 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

For the year ended December 31,

 
  

2023

  

2022

 
  

Available-for-sale Securities

  

Available-for-sale Securities

 
  

(In Thousands)

 

Fair value, beginning of period

 $10,860  $16,992 

Transfers into Level 3

  -   4,860 

Total realized gains included in income

  -   - 

Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end

  160   (805)

Purchases

  -   - 

Transfers out of Level 3

  (4,160)  (10,187)

Fair value, end of period

 $6,860  $10,860 
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

December 31,

 
  

2023

  

2022

 
  

Carrying Amount

  

Fair Value

  

Carrying Amount

  

Fair Value

 
  

(In Thousands)

 

Financial Assets:

                

Level 1 Inputs:

                

Cash and cash equivalents

 $2,030,513  $2,030,513  $814,538  $814,538 

Held-to-maturity U.S. Treasury securities

  508,985   484,267   507,151   470,954 
                 

Level 2 Inputs:

                

Federal funds sold

  100,575   100,575   1,515   1,515 

Held-to-maturity debt securities

  473,429   422,674   526,720   464,749 

Mortgage loans held for sale

  5,071   5,071   1,607   1,604 

Restricted equity securities

  10,226   10,226   7,734   7,734 
                 

Level 3 Inputs:

                

Held-to-maturity debt securities

  250   250   250   250 

Loans, net

  11,505,512   11,032,819   11,541,671   11,265,517 
                 

Financial Liabilities:

                

Level 2 Inputs:

                

Deposits

 $13,273,511  $13,266,640  $11,546,805  $11,529,647 

Federal funds purchased

  1,256,724   1,256,724   1,618,798   1,618,798 

Other borrowings

  64,735   58,083   64,726   57,101