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Securities - Unrealized Losses on Held-to-Maturity Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months $ 8,293 $ 24,543
12 Months or Longer 258,806 237,149
Total 267,099 261,692
Unrealized Losses    
Less than 12 Months 604 3,903
12 Months or Longer 44,654 46,749
Total 45,258 50,652
U.S. Treasuries    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 75,459 73,542
Total 75,459 73,542
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 10,966 12,937
Total 10,966 12,937
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 8,293 24,543
12 Months or Longer 183,347 163,607
Total 191,640 188,150
Unrealized Losses    
Less than 12 Months 604 3,903
12 Months or Longer 33,688 33,812
Total $ 34,292 $ 37,715