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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Held-to-maturity:    
Amortized Cost $ 177,078 $ 191,753
Gross unrealized gains 29 106
Gross unrealized losses (5,708) (2,658)
Fair value 171,399 189,201
Available for Sale    
Amortized cost 1,349,380 1,306,741
Gross unrealized gains 3,407 8,458
Gross unrealized losses (26,695) (11,133)
Fair value 1,326,092 1,304,066
Equity securities    
Fair Value 753 825
Residential - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost 96,619 100,279
Gross unrealized gains 29 106
Gross unrealized losses (3,510) (2,222)
Fair value 93,138 98,163
Available for Sale    
Amortized cost 831,728 808,242
Gross unrealized gains 493 2,230
Gross unrealized losses (20,899) (9,789)
Fair value 811,322 800,683
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 54,628 40,012
Gross unrealized gains 0 0
Gross unrealized losses (1,171) (287)
Fair value 53,457 39,725
Commercial - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost 80,459 91,474
Gross unrealized gains 0 0
Gross unrealized losses (2,198) (436)
Fair value 78,261 91,038
States and political subdivisions    
Available for Sale    
Amortized cost 177,766 178,459
Gross unrealized gains 1,385 2,041
Gross unrealized losses (1,930) (719)
Fair value 177,221 179,781
Corporate securities    
Available for Sale    
Amortized cost 68,433 73,772
Gross unrealized gains 51 582
Gross unrealized losses (426) (76)
Fair value 68,058 74,278
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 37,148 25,519
Gross unrealized gains 84 60
Gross unrealized losses (79) (69)
Fair value 37,153 25,510
Residential - Non-government agencies    
Available for Sale    
Amortized cost 44,667 45,679
Gross unrealized gains 396 1,084
Gross unrealized losses (623) 0
Fair value 44,440 46,763
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,010 135,058
Gross unrealized gains 998 2,461
Gross unrealized losses (1,567) (193)
Fair value 134,441 137,326
Equity securities    
Equity securities    
Amortized Cost 619 686
Gross Unrealized Gains 134 139
Gross Unrealized Losses 0 0
Fair Value $ 753 $ 825