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FAIR VALUE - Financial assets and liabilities accounted for at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Available-for-sale investment securities    
Fair Value $ 2,808,953 $ 2,919,992
Mortgage loans held for sale   400
Unpaid principal value of mortgage loans held for sale 1,200  
Transfers between Level 1 and Level 2 0  
Transfers between Level 2 and Level 1 0  
Transfers in of level 3 0  
Transfers Out of level 3 0  
U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 2,056,048 2,080,783
Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 417,443 474,363
Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 320,295 348,526
Corporate debt securities    
Available-for-sale investment securities    
Fair Value 7,497 7,394
Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 7,670 8,926
Recurring    
Available-for-sale investment securities    
Fair Value 2,808,953 2,919,992
Equity securities 2,005 372
Mortgage loans held for sale 1,229 414
Total 2,812,649 2,920,786
Recurring | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 431  
Derivative liability (431)  
Recurring | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   6
Recurring | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 462 2
Recurring | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 2,056,048 2,080,783
Recurring | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 417,443 474,363
Recurring | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 320,295 348,526
Recurring | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 7,497 7,394
Recurring | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 7,670 8,926
Recurring | Level 1    
Available-for-sale investment securities    
Fair Value 1,996,264 2,019,089
Equity securities 2,005 372
Mortgage loans held for sale 0 0
Total 1,998,269 2,019,461
Recurring | Level 1 | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 0  
Derivative liability 0  
Recurring | Level 1 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   0
Recurring | Level 1 | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 0 0
Recurring | Level 1 | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 1,996,264 2,019,089
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 812,689 900,903
Equity securities 0 0
Mortgage loans held for sale 1,229 414
Total 813,918 901,323
Recurring | Level 2 | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 431  
Derivative liability (431)  
Recurring | Level 2 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   6
Recurring | Level 2 | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 0 0
Recurring | Level 2 | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 59,784 61,694
Recurring | Level 2 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 417,443 474,363
Recurring | Level 2 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 320,295 348,526
Recurring | Level 2 | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 7,497 7,394
Recurring | Level 2 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 7,670 8,926
Recurring | Level 3    
Available-for-sale investment securities    
Fair Value 0 0
Equity securities 0 0
Mortgage loans held for sale 0 0
Total 462 2
Recurring | Level 3 | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 0  
Derivative liability 0  
Recurring | Level 3 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset   0
Recurring | Level 3 | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 462 2
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