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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Held-to-maturity:    
Amortized Cost $ 152,852 $ 191,753
Gross unrealized gains 0 106
Gross unrealized losses (6,386) (2,658)
Fair value 146,466 189,201
Available for Sale    
Amortized cost 1,269,884 1,306,741
Gross unrealized gains 1,561 8,458
Gross unrealized losses (38,443) (11,133)
Fair value 1,233,002 1,304,066
Equity securities    
Fair Value 885 825
Residential - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost 87,356 100,279
Gross unrealized gains 0 106
Gross unrealized losses (4,339) (2,222)
Fair value 83,017 98,163
Available for Sale    
Amortized cost 763,635 808,242
Gross unrealized gains 297 2,230
Gross unrealized losses (29,575) (9,789)
Fair value 734,357 800,683
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 53,618 40,012
Gross unrealized gains 0 0
Gross unrealized losses (2,413) (287)
Fair value 51,205 39,725
Commercial - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost 65,496 91,474
Gross unrealized gains 0 0
Gross unrealized losses (2,047) (436)
Fair value 63,449 91,038
States and political subdivisions    
Available for Sale    
Amortized cost 175,495 178,459
Gross unrealized gains 788 2,041
Gross unrealized losses (2,731) (719)
Fair value 173,552 179,781
Corporate securities    
Available for Sale    
Amortized cost 65,587 73,772
Gross unrealized gains 23 582
Gross unrealized losses (477) (76)
Fair value 65,133 74,278
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 34,566 25,519
Gross unrealized gains 0 60
Gross unrealized losses (647) (69)
Fair value 33,919 25,510
Residential - Non-government agencies    
Available for Sale    
Amortized cost 42,069 45,679
Gross unrealized gains 132 1,084
Gross unrealized losses (831) 0
Fair value 41,370 46,763
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 134,914 135,058
Gross unrealized gains 321 2,461
Gross unrealized losses (1,769) (193)
Fair value 133,466 137,326
Equity securities    
Equity securities    
Amortized Cost 712 686
Gross Unrealized Gains 173 139
Gross Unrealized Losses 0 0
Fair Value $ 885 $ 825