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FAIR VALUE, Financial Assets and Liabilities Accounted for at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities $ 3,044,428  
Equity securities 451 $ 432
U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,043,759 2,023,753
Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 512,208 459,154
Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 432,862 382,477
Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,528 2,546
Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 53,071 68,119
Recurring [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 3,044,428 2,936,049
Equity securities 451 432
Mortgage loans held for sale   83
Total 3,045,144 2,936,615
Recurring [Member] | Interest Rate Swap Agreements [Member]    
Available-for-sale investment securities [Abstract]    
Derivative asset 851 793
Derivative liability (586) (742)
Recurring [Member] | U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,043,759 2,023,753
Recurring [Member] | Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 512,208 459,154
Recurring [Member] | Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 432,862 382,477
Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,528 2,546
Recurring [Member] | Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 53,071 68,119
Recurring [Member] | Level 1 [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 1,878,705 1,896,931
Equity securities 451 432
Mortgage loans held for sale   0
Total 1,879,156 1,897,363
Recurring [Member] | Level 1 [Member] | Interest Rate Swap Agreements [Member]    
Available-for-sale investment securities [Abstract]    
Derivative asset 0 0
Derivative liability 0 0
Recurring [Member] | Level 1 [Member] | U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 1,878,705 1,896,931
Recurring [Member] | Level 1 [Member] | Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 1 [Member] | Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 1 [Member] | Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 2 [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 1,165,723 1,039,118
Equity securities 0 0
Mortgage loans held for sale   83
Total 1,165,988 1,039,252
Mortgage loans held for sale 0  
Recurring [Member] | Level 2 [Member] | Interest Rate Swap Agreements [Member]    
Available-for-sale investment securities [Abstract]    
Derivative asset 851 793
Derivative liability (586) (742)
Recurring [Member] | Level 2 [Member] | U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 165,054 126,822
Recurring [Member] | Level 2 [Member] | Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 512,208 459,154
Recurring [Member] | Level 2 [Member] | Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 432,862 382,477
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,528 2,546
Recurring [Member] | Level 2 [Member] | Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 53,071 68,119
Recurring [Member] | Level 3 [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Equity securities 0 0
Mortgage loans held for sale   0
Total 0 0
Recurring [Member] | Level 3 [Member] | Interest Rate Swap Agreements [Member]    
Available-for-sale investment securities [Abstract]    
Derivative asset 0 0
Derivative liability 0 0
Recurring [Member] | Level 3 [Member] | U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 3 [Member] | Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 3 [Member] | Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 0 0
Recurring [Member] | Level 3 [Member] | Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities $ 0 $ 0