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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Held to Maturity    
Amortized cost $ 247,917 $ 238,287
Gross unrealized gains 123 196
Gross unrealized losses (3,904) (2,886)
Estimated fair value 244,136 235,597
Available for Sale    
Amortized cost 1,267,503 1,216,706
Gross unrealized gains 13,615 19,186
Gross unrealized losses (8,863) (6,874)
Available for sale, at fair value 1,272,255 1,229,018
Residential - U.S. Government sponsored entities    
Held to Maturity    
Amortized cost 152,315 140,741
Gross unrealized gains 123 196
Gross unrealized losses (2,915) (2,150)
Estimated fair value 149,523 138,787
Available for Sale    
Amortized cost 771,657 744,527
Gross unrealized gains 5,885 11,064
Gross unrealized losses (5,633) (4,033)
Available for sale, at fair value 771,909 751,558
Commercial - U.S. Government sponsored entities    
Held to Maturity    
Amortized cost 95,602 97,546
Gross unrealized gains 0 0
Gross unrealized losses (989) (736)
Estimated fair value 94,613 96,810
Available for Sale    
Amortized cost 135,439 135,630
Gross unrealized gains 2,033 2,946
Gross unrealized losses (1,118) (935)
Available for sale, at fair value 136,354 137,641
States and political subdivisions    
Available for Sale    
Amortized cost 187,552 191,280
Gross unrealized gains 3,819 2,054
Gross unrealized losses (898) (1,689)
Available for sale, at fair value 190,473 191,645
Corporate securities    
Available for Sale    
Amortized cost 107,721 99,237
Gross unrealized gains 1,077 1,492
Gross unrealized losses (227) (125)
Available for sale, at fair value 108,571 100,604
Residential - Non-government sponsored entities    
Available for Sale    
Amortized cost 64,286 45,275
Gross unrealized gains 733 1,510
Gross unrealized losses (987) (92)
Available for sale, at fair value 64,032 46,693
Other    
Available for Sale    
Amortized cost 848 757
Gross unrealized gains 68 120
Gross unrealized losses 0 0
Available for sale, at fair value $ 916 $ 877