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FAIR VALUE - Financial Assets and Liabilities Accounted for at Fair Value On a Recurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Available-for-sale investment securities    
Available-for-sale investment securities $ 5,170,689 $ 4,934,210
Equity securities 439 463
Derivative asset   51
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    
Available-for-sale investment securities 4,275,440 3,998,564
Obligations of state and political subdivisions    
Available-for-sale investment securities    
Available-for-sale investment securities 489,910 430,289
Government agency mortgage-backed securities    
Available-for-sale investment securities    
Available-for-sale investment securities 384,891 477,056
Corporate debt securities    
Available-for-sale investment securities    
Available-for-sale investment securities 7,033 7,962
Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Available-for-sale investment securities 13,415 20,339
Level 3    
Available-for-sale investment securities    
Derivative asset (32)  
Recurring    
Available-for-sale investment securities    
Available-for-sale investment securities 5,170,689 4,934,210
Equity securities 439 463
Total 5,171,111 4,935,049
Recurring | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 2 296
Derivative liability (2) (3)
Recurring | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset 15 32
Recurring | Commitments to originate real estate loans for sale    
Available-for-sale investment securities    
Derivative asset (32) 51
Recurring | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Available-for-sale investment securities 4,275,440 3,998,564
Recurring | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Available-for-sale investment securities 489,910 430,289
Recurring | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Available-for-sale investment securities 384,891 477,056
Recurring | Corporate debt securities    
Available-for-sale investment securities    
Available-for-sale investment securities 7,033 7,962
Recurring | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Available-for-sale investment securities 13,415 20,339
Recurring | Level 1    
Available-for-sale investment securities    
Available-for-sale investment securities 4,206,653 3,900,924
Equity securities 439 463
Total 4,207,092 3,901,387
Recurring | Level 1 | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 0 0
Derivative liability 0 0
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    
Available-for-sale investment securities 4,206,653 3,900,924
Recurring | Level 1 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 1 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 1 | Corporate debt securities    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 1 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 2    
Available-for-sale investment securities    
Available-for-sale investment securities 964,036 1,033,286
Equity securities 0 0
Total 964,051 1,033,611
Recurring | Level 2 | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 2 296
Derivative liability (2) (3)
Recurring | Level 2 | Forward sales commitments    
Available-for-sale investment securities    
Derivative asset 15 32
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    
Available-for-sale investment securities 68,787 97,640
Recurring | Level 2 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Available-for-sale investment securities 489,910 430,289
Recurring | Level 2 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Available-for-sale investment securities 384,891 477,056
Recurring | Level 2 | Corporate debt securities    
Available-for-sale investment securities    
Available-for-sale investment securities 7,033 7,962
Recurring | Level 2 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Available-for-sale investment securities 13,415 20,339
Recurring | Level 3    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Equity securities 0 0
Total (32) 51
Recurring | Level 3 | Interest rate swap agreements    
Available-for-sale investment securities    
Derivative asset 0 0
Derivative liability 0 0
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) 51
Recurring | Level 3 | U.S. Treasury and agency securities    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 3 | Obligations of state and political subdivisions    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 3 | Government agency mortgage-backed securities    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 3 | Corporate debt securities    
Available-for-sale investment securities    
Available-for-sale investment securities 0 0
Recurring | Level 3 | Government agency collateralized mortgage obligations    
Available-for-sale investment securities    
Available-for-sale investment securities $ 0 $ 0