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FAIR VALUE - Financial assets and liabilities accounted for at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Available-for-sale investment securities    
Fair Value $ 2,863,864 $ 2,919,992
Equity securities 388 372
Mortgage loans held for sale   400
Unpaid principal value of mortgage loans held for sale 100  
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 2,055,517 2,080,783
Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 460,149 474,363
Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 332,479 348,526
Corporate debt securities    
Available-for-sale investment securities    
Fair Value 7,440 7,394
Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 8,279 8,926
Recurring    
Available-for-sale investment securities    
Fair Value 2,863,864 2,919,992
Equity securities 388 372
Mortgage loans held for sale 88 414
Total 2,864,409 2,920,786
Recurring | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset 37 6
Recurring | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 32 2
Recurring | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Fair Value 2,055,517 2,080,783
Recurring | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 460,149 474,363
Recurring | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 332,479 348,526
Recurring | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 7,440 7,394
Recurring | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 8,279 8,926
Recurring | Level 1    
Available-for-sale investment securities    
Fair Value 1,995,421 2,019,089
Equity securities 388 372
Mortgage loans held for sale 0 0
Total 1,995,809 2,019,461
Recurring | Level 1 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset 0 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 1,995,421 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 868,443 900,903
Equity securities 0 0
Mortgage loans held for sale 88 414
Total 868,568 901,323
Recurring | Level 2 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset 37 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 60,096 61,694
Recurring | Level 2 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Fair Value 460,149 474,363
Recurring | Level 2 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Fair Value 332,479 348,526
Recurring | Level 2 | Corporate debt securities    
Available-for-sale investment securities    
Fair Value 7,440 7,394
Recurring | Level 2 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Fair Value 8,279 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 32 2
Recurring | Level 3 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset 0 0
Recurring | Level 3 | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset 32 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