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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Available for Sale    
Amortized cost $ 1,539,488 $ 1,156,031
Gross unrealized gains 13,371 28,005
Gross unrealized losses (17,409) (1,427)
Fair value 1,535,450 1,182,609
Available-for-sale, allowance for credit loss 0 0
States and political subdivisions    
Available for Sale    
Amortized cost 210,330 163,573
Gross unrealized gains 3,336 5,370
Gross unrealized losses (1,799) (177)
Fair value 211,867 168,766
Available-for-sale, allowance for credit loss 0 0
Corporate securities    
Available for Sale    
Amortized cost 41,836 47,351
Gross unrealized gains 133 788
Gross unrealized losses (719) (131)
Fair value 41,250 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 38,093 33,413
Gross unrealized gains 87 18
Gross unrealized losses (391) (286)
Fair value 37,789 33,145
Available-for-sale, allowance for credit loss 0 0
Residential - U.S. Government-sponsored entities    
Available for Sale    
Amortized cost 1,118,545 762,309
Gross unrealized gains 6,771 16,816
Gross unrealized losses (13,553) (299)
Fair value 1,111,763 778,826
Available-for-sale, allowance for credit loss 0 0
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 76,120 85,405
Gross unrealized gains 1,504 2,564
Gross unrealized losses (868) (500)
Fair value 76,756 87,469
Available-for-sale, allowance for credit loss 0 0
Residential - Non-government agencies    
Available for Sale    
Amortized cost 13,241 22,671
Gross unrealized gains 493 786
Gross unrealized losses (79) (34)
Fair value 13,655 23,423
Available-for-sale, allowance for credit loss 0 0
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 41,323 41,309
Gross unrealized gains 1,047 1,663
Gross unrealized losses 0 0
Fair value 42,370 42,972
Available-for-sale, allowance for credit loss $ 0 $ 0