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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Held-to-Maturity:    
Amortized Cost $ 234,230 $ 247,917
Gross unrealized gains 3,836 123
Gross unrealized losses 0 (3,904)
Fair value 238,066 244,136
Available for Sale    
Amortized cost 1,226,539 1,267,503
Gross unrealized gains 34,324 13,615
Gross unrealized losses (270) (8,863)
Fair value 1,260,593 1,272,255
Residential - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 139,626 152,315
Gross unrealized gains 835 123
Gross unrealized losses 0 (2,915)
Fair value 140,461 149,523
Available for Sale    
Amortized cost 738,692 771,657
Gross unrealized gains 12,222 5,885
Gross unrealized losses (251) (5,633)
Fair value 750,663 771,909
Commercial - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 94,604 95,602
Gross unrealized gains 3,001 0
Gross unrealized losses 0 (989)
Fair value 97,605 94,613
States and political subdivisions    
Available for Sale    
Amortized cost 186,202 187,552
Gross unrealized gains 7,680 3,819
Gross unrealized losses (19) (898)
Fair value 193,863 190,473
Corporate securities    
Available for Sale    
Amortized cost 106,907 107,721
Gross unrealized gains 3,017 1,077
Gross unrealized losses 0 (227)
Fair value 109,924 108,571
Residential - Non-government agencies    
Available for Sale    
Amortized cost 58,734 64,286
Gross unrealized gains 2,736 733
Gross unrealized losses 0 (987)
Fair value 61,470 64,032
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,344 135,439
Gross unrealized gains 8,589 2,033
Gross unrealized losses 0 (1,118)
Fair value 143,933 136,354
Other    
Available for Sale    
Amortized cost 660 848
Gross unrealized gains 80 68
Gross unrealized losses 0 0
Fair value $ 740 $ 916