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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Held-to-maturity:    
Amortized Cost $ 158,156 $ 191,753
Gross unrealized gains 3 106
Gross unrealized losses (5,829) (2,658)
Fair value 152,330 189,201
Available for Sale    
Amortized cost 1,308,514 1,306,741
Gross unrealized gains 2,891 8,458
Gross unrealized losses (31,436) (11,133)
Fair value 1,279,969 1,304,066
Equity securities    
Fair Value 844 825
Residential - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost 92,247 100,279
Gross unrealized gains 3 106
Gross unrealized losses (3,916) (2,222)
Fair value 88,334 98,163
Available for Sale    
Amortized cost 797,679 808,242
Gross unrealized gains 389 2,230
Gross unrealized losses (24,343) (9,789)
Fair value 773,725 800,683
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 54,429 40,012
Gross unrealized gains 0 0
Gross unrealized losses (2,006) (287)
Fair value 52,423 39,725
Commercial - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost 65,909 91,474
Gross unrealized gains 0 0
Gross unrealized losses (1,913) (436)
Fair value 63,996 91,038
States and political subdivisions    
Available for Sale    
Amortized cost 176,640 178,459
Gross unrealized gains 1,258 2,041
Gross unrealized losses (1,980) (719)
Fair value 175,918 179,781
Corporate securities    
Available for Sale    
Amortized cost 65,908 73,772
Gross unrealized gains 28 582
Gross unrealized losses (504) (76)
Fair value 65,432 74,278
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 35,746 25,519
Gross unrealized gains 23 60
Gross unrealized losses (266) (69)
Fair value 35,503 25,510
Residential - Non-government agencies    
Available for Sale    
Amortized cost 43,150 45,679
Gross unrealized gains 316 1,084
Gross unrealized losses (620) 0
Fair value 42,846 46,763
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 134,962 135,058
Gross unrealized gains 877 2,461
Gross unrealized losses (1,717) (193)
Fair value 134,122 137,326
Equity securities    
Equity securities    
Amortized Cost 692 686
Gross Unrealized Gains 152 139
Gross Unrealized Losses 0 0
Fair Value $ 844 $ 825