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PARENT COMPANY AND REGULATORY RESTRICTIONS (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Expense:                      
Interest on long-term debt                 $ 2,626 $ 2,572 $ 3,119
Income tax expense (benefit)                 27,088 20,389 (112,247)
Net income $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 13,265 $ 8,230 $ 9,150 $ 9,808 45,868 40,453 172,075
Parent                      
Income:                      
Dividends from subsidiary banks                 111,765 159,319 0
Interest income:                      
Interest from subsidiary banks                 9 16 30
Other income                 91 89 2,001
Total income                 111,865 159,424 2,031
Expense:                      
Interest on long-term debt                 2,626 2,572 3,118
Other expenses                 2,551 2,262 2,679
Total expenses                 5,177 4,834 5,797
Gain (loss) before income taxes and equity in undistributed income of subsidiaries                 106,688 154,590 (3,766)
Income tax expense (benefit)                 670 (2,520) (31,891)
Income before equity in undistributed income of subsidiaries                 106,018 157,110 28,125
Equity in undistributed income (loss) of subsidiary bank                 (60,150) (116,657) 143,945
Equity in undistributed income of other subsidiaries                 0 0 5
Net income                 $ 45,868 $ 40,453 $ 172,075