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Note 2 - Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

(in thousands)

 

Amortized

  

Unrealized

  

Fair

 

September 30, 2023

 cost  

Gains

  

Losses

  value 
                 

U.S. Treasury and other U.S. Government obligations

 $123,500  $-  $(5,491) $118,009 

Government sponsored enterprise obligations

  115,862   184   (6,813)  109,233 

Mortgage backed securities - government agencies

  814,224   -   (141,558)  672,666 

Obligations of states and political subdivisions

  138,279   -   (21,388)  116,891 

Other

  3,856   -   (407)  3,449 
                 

Total available for sale debt securities

 $1,195,721  $184  $(175,657) $1,020,248 
                 

December 31, 2022

                
                 

U.S. Treasury and other U.S. Government obligations

 $122,966  $-  $(7,927) $115,039 

Government sponsored enterprise obligations

  149,773   290   (6,437)  143,626 

Mortgage backed securities - government agencies

  874,265   58   (121,585)  752,738 

Obligations of states and political subdivisions

  145,016   1   (17,418)  127,599 

Other

  5,957   -   (342)  5,615 
                 

Total available for sale debt securities

 $1,297,977  $349  $(153,709) $1,144,617 
Debt Securities, Held-to-Maturity [Table Text Block]

(in thousands)

 

Carrying

  

Unrecognized

  

Fair

 

September 30, 2023

 value  

Gains

  

Losses

  value 
                 

U.S. Treasury and other U.S. Government obligations

 $204,139  $-  $(7,645) $196,494 

Government sponsored enterprise obligations

  26,972   -   (3,536)  23,436 

Mortgage backed securities - government agencies

  214,094   -   (36,606)  177,488 
                 

Total held to maturity debt securities

 $445,205  $-  $(47,787) $397,418 
                 

December 31, 2022

                

U.S. Treasury and other U.S. Government obligations

 $217,794  $-  $(9,166) $208,628 

Government sponsored enterprise obligations

  27,507   -   (2,559)  24,948 

Mortgage backed securities - government agencies

  227,916   -   (29,659)  198,257 
                 

Total held to maturity debt securities

 $473,217  $-  $(41,384) $431,833 
Investments Classified by Contractual Maturity Date [Table Text Block]
  

AFS Debt Securities

  

HTM Debt Securities

 
             

(in thousands)

 

Amortized cost

  

Fair value

  

Carrying value

  

Fair value

 
                 

Due within one year

 $117,105  $112,410  $51,077  $50,188 

Due after one year but within five years

  54,505   50,972   153,800   147,004 

Due after five years but within 10 years

  79,708   66,296   25,660   22,176 

Due after 10 years

  130,179   117,904   574   562 

Mortgage backed securities - government agencies

  814,224   672,666   214,094   177,488 

Total

 $1,195,721  $1,020,248  $445,205  $397,418 
Schedule of Unrealized Loss on Investments [Table Text Block]
  

AFS Debt Securities

 
  

Less than 12 months

  

12 months or more

  

Total

 

(in thousands)

 

Fair

  

Unrealized

  

Fair

  

Unrealized

  

Fair

  

Unrealized

 

September 30, 2023

 

value

  

losses

  

value

  

losses

  

value

  

losses

 
                         

U.S. Treasury and other U.S. Government obligations

 $-  $-  $118,009  $(5,491) $118,009  $(5,491)

Government sponsored enterprise obligations

  10,262   (42)  83,081   (6,771)  93,343   (6,813)

Mortgage-backed securities - government agencies

  29,149   (1,633)  643,517   (139,925)  672,666   (141,558)

Obligations of states and political subdivisions

  13,482   (929)  103,094   (20,459)  116,576   (21,388)

Other

  -   -   3,449   (407)  3,449   (407)
                         

Total AFS debt securities

 $52,893  $(2,604) $951,150  $(173,053) $1,004,043  $(175,657)
                         

December 31, 2022

                        
                         

U.S. Treasury and other U.S. Government obligations

 $3,025  $(57) $111,966  $(7,870) $114,991  $(7,927)

Government sponsored enterprise obligations

  99,785   (3,553)  22,484   (2,884)  122,269   (6,437)

Mortgage-backed securities - government agencies

  180,263   (11,114)  567,988   (110,471)  748,251   (121,585)

Obligations of states and political subdivisions

  64,165   (3,763)  56,864   (13,655)  121,029   (17,418)

Other

  4,865   (213)  749   (129)  5,614   (342)
                         

Total AFS debt securities

 $352,103  $(18,700) $760,051  $(135,009) $1,112,154  $(153,709)
  

HTM Debt Securities

 
  

Less than 12 months

  

12 months or more

  

Total

 

(in thousands)

 

Fair

  

Unrecognized

  

Fair

  

Unrecognized

  

Fair

  

Unrecognized

 

September 30, 2023

 

value

  

losses

  

value

  

losses

  

value

  

losses

 
                         

U.S. Treasury and other U.S. Government obligations

 $-  $-  $196,494  $(7,645) $196,494  $(7,645)

Government sponsored enterprise obligations

  1,415   (4)  22,009   (3,532)  23,424   (3,536)

Mortgage-backed securities - government agencies

  -   -   177,451   (36,606)  177,451   (36,606)
                         

Total HTM debt securities

 $1,415  $(4) $395,954  $(47,783) $397,369  $(47,787)
                         

December 31, 2022

                        
                         

U.S. Treasury and other U.S. Government obligations

 $208,628  $(9,166) $-  $-  $208,628  $(9,166)

Government sponsored enterprise obligations

  24,948   (2,559)  -   -   24,948   (2,559)

Mortgage-backed securities - government agencies

  198,257   (29,659)  -   -   198,257   (29,659)
                         

Total HTM debt securities

 $431,833  $(41,384) $-  $-  $431,833  $(41,384)