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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Assets    
Securities available-for-sale $ 2,204,511 $ 1,862,270
Estimate of Fair Value Measurement    
Assets    
Other investments 85,521 69,801
Obligations of U.S. Government-sponsored enterprises    
Assets    
Securities available-for-sale 242,370 276,040
Obligations of states and political subdivisions    
Assets    
Securities available-for-sale 464,052 409,197
Agency mortgage-backed securities    
Assets    
Securities available-for-sale 1,358,510 1,027,394
U.S. Treasury bills    
Assets    
Securities available-for-sale 116,055 128,893
Corporate debt securities    
Assets    
Securities available-for-sale 23,524 20,746
Recurring basis | Estimate of Fair Value Measurement    
Assets    
Securities available-for-sale 2,204,511 1,862,270
Other investments 3,078 2,983
Derivative financial instruments 13,862 15,144
Total assets 2,221,451 1,880,397
Liabilities    
Derivative financial instruments 11,037 18,692
Total liabilities 11,037 18,692
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement    
Assets    
Securities available-for-sale 242,370 276,040
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement    
Assets    
Securities available-for-sale 464,052 409,197
Recurring basis | Agency mortgage-backed securities | Estimate of Fair Value Measurement    
Assets    
Securities available-for-sale 1,358,510 1,027,394
Recurring basis | U.S. Treasury bills | Estimate of Fair Value Measurement    
Assets    
Securities available-for-sale 23,524 128,893
Recurring basis | Corporate debt securities | Estimate of Fair Value Measurement    
Assets    
Securities available-for-sale 116,055 20,746
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Securities available-for-sale 0 0
Other investments 0 0
Derivative financial instruments 0 0
Total assets 0 0
Liabilities    
Derivative financial instruments 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) | U.S. Treasury bills    
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 | Significant Other Observable Inputs (Level 2)    
Assets    
Securities available-for-sale 2,204,511 1,862,270
Other investments 3,078 2,983
Derivative financial instruments 13,862 15,144
Total assets 2,221,451 1,880,397
Liabilities    
Derivative financial instruments 11,037 18,692
Total liabilities 11,037 18,692
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises    
Assets    
Securities available-for-sale 242,370 276,040
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions    
Assets    
Securities available-for-sale 464,052 409,197
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities    
Assets    
Securities available-for-sale 1,358,510 1,027,394
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasury bills    
Assets    
Securities available-for-sale 23,524 128,893
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Assets    
Securities available-for-sale 116,055 20,746
Recurring basis | Significant Unobservable Inputs (Level 3)    
Assets    
Securities available-for-sale 0 0
Other investments 0 0
Derivative financial instruments 0 0
Total assets 0 0
Liabilities    
Derivative financial instruments 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) | U.S. Treasury bills    
Assets    
Securities available-for-sale 0 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities    
Assets    
Securities available-for-sale $ 0 $ 0