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Securities - Unrealized Losses on Available-for-Sale of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value    
Less than 12 Months $ 38,070 $ 31,829
12 Months or Longer 988,694 1,011,691
Total 1,026,764 1,043,520
Unrealized Losses    
Less than 12 Months 344 286
12 Months or Longer 150,519 140,922
Total 150,863 141,208
U.S. Treasuries    
Fair Value    
Less than 12 Months 9,942 0
12 Months or Longer 65,460 65,663
Total 75,402 65,663
Unrealized Losses    
Less than 12 Months 1 0
12 Months or Longer 5,243 5,009
Total 5,244 5,009
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 14,384 14,453
12 Months or Longer 219,684 220,913
Total 234,068 235,366
Unrealized Losses    
Less than 12 Months 188 110
12 Months or Longer 23,407 22,167
Total 23,595 22,277
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 1,607 10,572
12 Months or Longer 78,913 69,601
Total 80,520 80,173
Unrealized Losses    
Less than 12 Months 13 106
12 Months or Longer 8,749 7,971
Total 8,762 8,077
U.S. Government agencies    
Fair Value    
Less than 12 Months 1,137 1,145
12 Months or Longer 41,049 43,764
Total 42,186 44,909
Unrealized Losses    
Less than 12 Months 8 4
12 Months or Longer 5,195 4,740
Total 5,203 4,744
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 11,000 5,659
12 Months or Longer 581,249 609,456
Total 592,249 615,115
Unrealized Losses    
Less than 12 Months 134 66
12 Months or Longer 107,764 100,829
Total 107,898 100,895
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 2,339 2,294
Total 2,339 2,294
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 161 206
Total $ 161 $ 206