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NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift, Interest [Abstract]                      
Net interest income $ 59,158 $ 57,971 $ 57,441 $ 57,697 $ 58,748 $ 56,971 $ 52,637 $ 45,493 $ 232,267 $ 213,849 $ 178,691
Provision for loan losses 4,100 4,734 4,522 4,006 4,431 4,240 4,204 3,851 17,362 16,726 14,968
Net interest income after provision for loan losses                 214,905 197,123 163,723
Total non-interest income 16,725 18,941 14,555 15,630 12,248 12,698 16,780 12,562 65,851 54,288 47,770
Total non-interest expense 61,090 48,844 46,268 47,100 48,279 49,378 54,025 45,148 203,302 196,829 165,986
Income from continuing operations before income taxes 10,693 23,334 21,206 22,221 18,286 16,051 11,188 9,056 77,454 54,582 45,507
Income tax expense 362 6,953 5,249 6,220 2,273 1,350 1,144 297 18,784 5,064 11,763
Net income $ 10,331 $ 16,381 $ 15,957 $ 16,001 $ 16,013 $ 14,701 $ 10,044 $ 8,759 $ 58,670 $ 49,518 $ 33,744