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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Held-to-maturity:    
Amortized Cost $ 0 $ 148,508
Gross unrealized gains   19
Gross unrealized losses   (4,255)
Fair value 0 144,272
Available for Sale    
Amortized cost 1,331,648 1,227,931
Gross unrealized gains 4,603 2,754
Gross unrealized losses (16,801) (25,207)
Fair value 1,319,450 1,205,478
Equity securities    
Fair Value 910 826
Residential - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost   83,436
Gross unrealized gains   19
Gross unrealized losses   (3,174)
Fair value   80,281
Available for Sale    
Amortized cost 791,994 736,175
Gross unrealized gains 1,183 369
Gross unrealized losses (13,517) (19,492)
Fair value 779,660 717,052
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 117,671 53,014
Gross unrealized gains 87 0
Gross unrealized losses (1,283) (1,531)
Fair value 116,475 51,483
Commercial - U.S. Government-sponsored entities    
Held-to-maturity:    
Amortized Cost   65,072
Gross unrealized gains   0
Gross unrealized losses   (1,081)
Fair value   63,991
States and political subdivisions    
Available for Sale    
Amortized cost 161,638 174,114
Gross unrealized gains 1,532 1,035
Gross unrealized losses (562) (1,475)
Fair value 162,608 173,674
Corporate securities    
Available for Sale    
Amortized cost 52,893 55,259
Gross unrealized gains 90 0
Gross unrealized losses (87) (410)
Fair value 52,896 54,849
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 31,985 33,257
Gross unrealized gains 0 0
Gross unrealized losses (448) (683)
Fair value 31,537 32,574
Residential - Non-government agencies    
Available for Sale    
Amortized cost 40,648 41,245
Gross unrealized gains 573 337
Gross unrealized losses (112) (464)
Fair value 41,109 41,118
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 134,819 134,867
Gross unrealized gains 1,138 1,013
Gross unrealized losses (792) (1,152)
Fair value 135,165 134,728
Equity securities    
Equity securities    
Amortized Cost 910 826
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 910 $ 826