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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available for Sale    
Amortized cost $ 1,213,382 $ 1,156,031
Gross unrealized gains 20,630 28,005
Gross unrealized losses (17,671) (1,427)
Fair value 1,216,341 1,182,609
Available-for-sale, allowance for credit loss 0 0
States and political subdivisions    
Available for Sale    
Amortized cost 165,180 163,573
Gross unrealized gains 3,355 5,370
Gross unrealized losses (2,190) (177)
Fair value 166,345 168,766
Available-for-sale, allowance for credit loss 0 0
Corporate securities    
Available for Sale    
Amortized cost 47,175 47,351
Gross unrealized gains 189 788
Gross unrealized losses (1,197) (131)
Fair value 46,167 48,008
Available-for-sale, allowance for credit loss 0 0
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 41,565 33,413
Gross unrealized gains 90 18
Gross unrealized losses (478) (286)
Fair value 41,177 33,145
Available-for-sale, allowance for credit loss 0 0
Residential - U.S. Government-sponsored entities    
Available for Sale    
Amortized cost 814,051 762,309
Gross unrealized gains 13,300 16,816
Gross unrealized losses (12,085) (299)
Fair value 815,266 778,826
Available-for-sale, allowance for credit loss 0 0
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 85,778 85,405
Gross unrealized gains 1,710 2,564
Gross unrealized losses (1,609) (500)
Fair value 85,879 87,469
Available-for-sale, allowance for credit loss 0 0
Residential - Non-government agencies    
Available for Sale    
Amortized cost 18,318 22,671
Gross unrealized gains 594 786
Gross unrealized losses (112) (34)
Fair value 18,800 23,423
Available-for-sale, allowance for credit loss 0 0
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 41,315 41,309
Gross unrealized gains 1,392 1,663
Gross unrealized losses 0 0
Fair value 42,707 42,972
Available-for-sale, allowance for credit loss $ 0 $ 0