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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Held-to-Maturity:    
Amortized Cost $ 241,597 $ 247,917
Gross unrealized gains 1,972 123
Gross unrealized losses (497) (3,904)
Fair value 243,072 244,136
Available for Sale    
Amortized cost 1,274,800 1,267,503
Gross unrealized gains 25,732 13,615
Gross unrealized losses (1,356) (8,863)
Fair value 1,299,176 1,272,255
Residential - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 146,497 152,315
Gross unrealized gains 242 123
Gross unrealized losses (497) (2,915)
Fair value 146,242 149,523
Available for Sale    
Amortized cost 782,288 771,657
Gross unrealized gains 10,358 5,885
Gross unrealized losses (1,000) (5,633)
Fair value 791,646 771,909
Commercial - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 95,100 95,602
Gross unrealized gains 1,730 0
Gross unrealized losses 0 (989)
Fair value 96,830 94,613
States and political subdivisions    
Available for Sale    
Amortized cost 186,878 187,552
Gross unrealized gains 5,280 3,819
Gross unrealized losses (356) (898)
Fair value 191,802 190,473
Corporate securities    
Available for Sale    
Amortized cost 107,315 107,721
Gross unrealized gains 2,481 1,077
Gross unrealized losses 0 (227)
Fair value 109,796 108,571
Residential - Non-government agencies    
Available for Sale    
Amortized cost 62,274 64,286
Gross unrealized gains 1,966 733
Gross unrealized losses 0 (987)
Fair value 64,240 64,032
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,392 135,439
Gross unrealized gains 5,578 2,033
Gross unrealized losses 0 (1,118)
Fair value 140,970 136,354
Other    
Available for Sale    
Amortized cost 653 848
Gross unrealized gains 69 68
Gross unrealized losses 0 0
Fair value $ 722 $ 916