Annual report pursuant to Section 13 and 15(d)

SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details)

v3.3.1.900
SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total $ 891,276 $ 1,075,235
Gross Unrealized Gains 16,661 28,737
Gross Unrealized (Losses) (4,645) (1,858)
Available for sale securities, Estimated fair value 903,292 1,102,114
US Government Agencies Debt Securities [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total   8,313
Gross Unrealized Gains   166
Gross Unrealized (Losses)   (25)
Available for sale securities, Estimated fair value   8,454
Obligations of States and Political Subdivisions [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 257,740 427,483
Gross Unrealized Gains 10,479 18,885
Gross Unrealized (Losses) (140) (721)
Available for sale securities, Estimated fair value 268,079 445,647
Corporate and Other Bonds [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 77,628 78,744
Gross Unrealized Gains 55 244
Gross Unrealized (Losses) (1,704) (308)
Available for sale securities, Estimated fair value 75,979 78,680
Mortgage Backed Securities [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 544,823 550,716
Gross Unrealized Gains 6,127 9,411
Gross Unrealized (Losses) (2,779) (798)
Available for sale securities, Estimated fair value 548,171 559,329
Other Securities [Member]    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale Securities, Amortized Cost Basis, Total 11,085 9,979
Gross Unrealized Gains   31
Gross Unrealized (Losses) (22) (6)
Available for sale securities, Estimated fair value $ 11,063 $ 10,004