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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Available for Sale    
Amortized cost $ 1,402,024 $ 1,156,031
Gross unrealized gains 16,552 28,005
Gross unrealized losses (11,236) (1,427)
Fair value 1,407,340 1,182,609
Available-for-sale, allowance for credit loss 0 0
States and political subdivisions    
Available for Sale    
Amortized cost 193,919 163,573
Gross unrealized gains 3,833 5,370
Gross unrealized losses (988) (177)
Fair value 196,764 168,766
Available-for-sale, allowance for credit loss 0 0
Corporate securities    
Available for Sale    
Amortized cost 46,999 47,351
Gross unrealized gains 194 788
Gross unrealized losses (515) (131)
Fair value 46,678 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 39,977 33,413
Gross unrealized gains 134 18
Gross unrealized losses (377) (286)
Fair value 39,734 33,145
Available-for-sale, allowance for credit loss 0 0
Residential - U.S. Government-sponsored entities    
Available for Sale    
Amortized cost 984,750 762,309
Gross unrealized gains 8,613 16,816
Gross unrealized losses (8,685) (299)
Fair value 984,678 778,826
Available-for-sale, allowance for credit loss 0 0
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 79,970 85,405
Gross unrealized gains 2,094 2,564
Gross unrealized losses (598) (500)
Fair value 81,466 87,469
Available-for-sale, allowance for credit loss 0 0
Residential - Non-government agencies    
Available for Sale    
Amortized cost 15,091 22,671
Gross unrealized gains 428 786
Gross unrealized losses (73) (34)
Fair value 15,446 23,423
Available-for-sale, allowance for credit loss 0 0
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 41,318 41,309
Gross unrealized gains 1,256 1,663
Gross unrealized losses 0 0
Fair value 42,574 42,972
Available-for-sale, allowance for credit loss $ 0 $ 0