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INVESTMENT SECURITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Held to Maturity    
Amortized Cost $ 262,778 $ 238,287
Gross unrealized gains 111 196
Gross unrealized losses (3,739) (2,886)
Estimated fair value 259,150 235,597
Available for Sale    
Amortized cost 1,269,531 1,216,706
Gross unrealized gains 14,930 19,186
Gross unrealized losses (10,149) (6,874)
Estimated fair value 1,274,312 1,229,018
Residential - U.S. Government sponsored entities    
Held to Maturity    
Amortized Cost 166,200 140,741
Gross unrealized gains 111 196
Gross unrealized losses (3,081) (2,150)
Estimated fair value 163,230 138,787
Available for Sale    
Amortized cost 776,223 744,527
Gross unrealized gains 7,559 11,064
Gross unrealized losses (5,715) (4,033)
Estimated fair value 778,067 751,558
Commercial - U.S. Government sponsored entities    
Held to Maturity    
Amortized Cost 96,578 97,546
Gross unrealized losses (658) (736)
Estimated fair value 95,920 96,810
Residential - Non-government agencies    
Available for Sale    
Amortized cost 69,603 45,275
Gross unrealized gains 1,273 1,510
Gross unrealized losses (519) (92)
Estimated fair value 70,357 46,693
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,535 135,630
Gross unrealized gains 2,566 2,946
Gross unrealized losses (950) (935)
Estimated fair value 137,151 137,641
States and political subdivisions debt securities    
Available for Sale    
Amortized cost 188,899 191,280
Gross unrealized gains 2,169 2,054
Gross unrealized losses (2,811) (1,689)
Estimated fair value 188,257 191,645
Corporate debt securities    
Available for Sale    
Amortized cost 98,454 99,237
Gross unrealized gains 1,262 1,492
Gross unrealized losses (154) (125)
Estimated fair value 99,562 100,604
Other    
Available for Sale    
Amortized cost 817 757
Gross unrealized gains 101 120
Estimated fair value $ 918 $ 877