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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 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 1,176,462 1,227,931
Gross unrealized gains 14,418 2,754
Gross unrealized losses (4,005) (25,207)
Fair value 1,186,875 1,205,478
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 721,081 736,175
Gross unrealized gains 5,796 369
Gross unrealized losses (3,233) (19,492)
Fair value 723,644 717,052
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 86,697 53,014
Gross unrealized gains 1,431 0
Gross unrealized losses (386) (1,531)
Fair value 87,742 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 122,171 174,114
Gross unrealized gains 2,593 1,035
Gross unrealized losses (53) (1,475)
Fair value 124,711 173,674
Corporate securities    
Available for Sale    
Amortized cost 30,436 55,259
Gross unrealized gains 277 0
Gross unrealized losses 0 (410)
Fair value 30,713 54,849
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 43,213 33,257
Gross unrealized gains 17 0
Gross unrealized losses (333) (683)
Fair value 42,897 32,574
Residential - Non-government agencies    
Available for Sale    
Amortized cost 38,140 41,245
Gross unrealized gains 969 337
Gross unrealized losses 0 (464)
Fair value 39,109 41,118
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 134,724 134,867
Gross unrealized gains 3,335 1,013
Gross unrealized losses 0 (1,152)
Fair value $ 138,059 $ 134,728