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FAIR VALUE, Financial Assets and Liabilities Accounted for at Fair Value On a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities $ 2,437,102  
Equity securities 461 $ 432
U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 1,506,647 2,023,753
Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 458,090 459,154
Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 411,816 382,477
Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,540 2,546
Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 58,009 68,119
Recurring [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,437,102 2,936,049
Equity securities 461 432
Mortgage loans held for sale   83
Total 2,437,910 2,936,615
Recurring [Member] | Interest Rate Swap Agreements [Member]    
Available-for-sale investment securities [Abstract]    
Derivative asset 1,095 793
Derivative liability (748) (742)
Recurring [Member] | U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 1,506,647 2,023,753
Recurring [Member] | Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 458,090 459,154
Recurring [Member] | Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 411,816 382,477
Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,540 2,546
Recurring [Member] | Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 58,009 68,119
Recurring [Member] | Level 1 [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 1,343,370 1,896,931
Equity securities 461 432
Mortgage loans held for sale   0
Total 1,343,831 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 1,343,370 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 1,093,732 1,039,118
Equity securities 0 0
Mortgage loans held for sale   83
Total 1,094,079 1,039,252
Mortgage loans held for sale, at principal value 0 100
Recurring [Member] | Level 2 [Member] | Interest Rate Swap Agreements [Member]    
Available-for-sale investment securities [Abstract]    
Derivative asset 1,095 793
Derivative liability (748) (742)
Recurring [Member] | Level 2 [Member] | U.S. Treasury and Agency Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 163,277 126,822
Recurring [Member] | Level 2 [Member] | Obligations of State and Political Subdivisions [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 458,090 459,154
Recurring [Member] | Level 2 [Member] | Government Agency Mortgage-Backed Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 411,816 382,477
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 2,540 2,546
Recurring [Member] | Level 2 [Member] | Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale investment securities [Abstract]    
Available-for-sale investment securities 58,009 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