v3.26.1
FAIR VALUE - Financial assets and liabilities accounted for at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
FAIR VALUE    
Fair value assets, Level 1 to level 2 $ 0  
Fair value assets, Level 2 to level 1 0  
Fair value liabilities, Level 1 to level 2 0  
Fair value liabilities, Level 2 to level 1 0  
Transfers into level 3 0  
Transfers out of level 3 0  
Available-for-sale investment securities    
Fair Value 2,957,963 $ 2,875,341
Derivative asset 4,528  
Derivative liability (8,054)  
U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 2,219,381 2,195,226
Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 435,993 391,917
Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 284,451 278,885
Corporate debt securities    
Available-for-sale investment securities    
Fair Value 8,471 4,912
Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 9,667 4,401
Level 2    
Available-for-sale investment securities    
Mortgage loans held for sale 1,600 100
Recurring    
Available-for-sale investment securities    
Fair Value 2,957,963 2,875,341
Equity securities 3,661 4,414
Mortgage loans held for sale 1,571 108
Total 2,959,669 2,880,032
Recurring | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 391 154
Recurring | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   15
Recurring | Interest rate swaps    
Available-for-sale investment securities    
Derivative asset 4,137 7,524
Derivative liability (8,054) (7,524)
Recurring | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 2,219,381 2,195,226
Recurring | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 435,993 391,917
Recurring | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 284,451 278,885
Recurring | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 8,471 4,912
Recurring | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 9,667 4,401
Recurring | Level 1    
Available-for-sale investment securities    
Fair Value 2,143,656 2,133,932
Equity securities 3,661 4,414
Mortgage loans held for sale 0 0
Total 2,147,317 2,138,346
Recurring | Level 1 | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 0 0
Recurring | Level 1 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   0
Recurring | Level 1 | Interest rate swaps    
Available-for-sale investment securities    
Derivative asset 0 0
Derivative liability 0 0
Recurring | Level 1 | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 2,143,656 2,133,932
Recurring | Level 1 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 1 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 1 | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 1 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 2    
Available-for-sale investment securities    
Fair Value 814,307 741,409
Equity securities 0 0
Mortgage loans held for sale 1,571 108
Total 811,961 741,532
Recurring | Level 2 | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 0 0
Recurring | Level 2 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   15
Recurring | Level 2 | Interest rate swaps    
Available-for-sale investment securities    
Derivative asset 4,137 7,524
Derivative liability (8,054) (7,524)
Recurring | Level 2 | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 75,725 61,294
Recurring | Level 2 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 435,993 391,917
Recurring | Level 2 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 284,451 278,885
Recurring | Level 2 | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 8,471 4,912
Recurring | Level 2 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 9,667 4,401
Recurring | Level 3    
Available-for-sale investment securities    
Fair Value 0 0
Equity securities 0 0
Mortgage loans held for sale 0 0
Total 391 154
Recurring | Level 3 | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 391 154
Recurring | Level 3 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   0
Recurring | Level 3 | Interest rate swaps    
Available-for-sale investment securities    
Derivative asset 0 0
Derivative liability 0 0
Recurring | Level 3 | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 3 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 3 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 3 | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 0 0
Recurring | Level 3 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value $ 0 $ 0