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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets    
Securities available for sale $ 1,611,883 $ 1,618,273
Estimate of Fair Value Measurement    
Assets    
Other investments 71,149 63,255
Obligations of U.S. Government-sponsored enterprises    
Assets    
Securities available for sale 295,802 296,446
Obligations of states and political subdivisions    
Assets    
Securities available for sale 422,979 432,171
Agency mortgage-backed securities    
Assets    
Securities available for sale 704,191 700,381
Corporate debt securities    
Assets    
Securities available for sale 181,100 181,701
U.S. Treasury bills    
Assets    
Securities available for sale 7,811 7,574
Recurring basis | Estimate of Fair Value Measurement    
Assets    
Securities available for sale 1,611,883 1,618,273
Other investments 2,928 2,941
Derivatives 18,564 17,789
Total assets 1,633,375 1,639,003
Liabilities    
Derivatives 20,455 16,184
Total liabilities 20,455 16,184
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement    
Assets    
Securities available for sale 295,802 296,446
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement    
Assets    
Securities available for sale 422,979 432,171
Recurring basis | Agency mortgage-backed securities | Estimate of Fair Value Measurement    
Assets    
Securities available for sale 704,191 700,381
Recurring basis | Corporate debt securities | Estimate of Fair Value Measurement    
Assets    
Securities available for sale 7,811 7,574
Recurring basis | U.S. Treasury bills | Estimate of Fair Value Measurement    
Assets    
Securities available for sale 181,100 181,701
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Securities available for sale 0 0
Other investments 0 0
Derivatives 0 0
Total assets 0 0
Liabilities    
Derivatives 0 0
Total liabilities 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Government-sponsored enterprises    
Assets    
Securities available for sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions    
Assets    
Securities available for sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency mortgage-backed securities    
Assets    
Securities available for sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities    
Assets    
Securities available for sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury bills    
Assets    
Securities available for sale 0 0
Recurring basis | Significant Other Observable Inputs (Level 2)    
Assets    
Securities available for sale 1,611,883 1,618,273
Other investments 2,928 2,941
Derivatives 18,564 17,789
Total assets 1,633,375 1,639,003
Liabilities    
Derivatives 20,455 16,184
Total liabilities 20,455 16,184
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises    
Assets    
Securities available for sale 295,802 296,446
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions    
Assets    
Securities available for sale 422,979 432,171
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities    
Assets    
Securities available for sale 704,191 700,381
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Assets    
Securities available for sale 7,811 7,574
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasury bills    
Assets    
Securities available for sale 181,100 181,701
Recurring basis | Significant Unobservable Inputs (Level 3)    
Assets    
Securities available for sale 0 0
Other investments 0 0
Derivatives 0 0
Total assets 0 0
Liabilities    
Derivatives 0 0
Total liabilities 0 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government-sponsored enterprises    
Assets    
Securities available for sale 0 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions    
Assets    
Securities available for sale 0 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Agency mortgage-backed securities    
Assets    
Securities available for sale 0 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities    
Assets    
Securities available for sale 0
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. Treasury bills    
Assets    
Securities available for sale $ 0 $ 0