LOANS - PCI Loans - Changes in the accretable yield for PCI loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in the accretable yield for PCI loans      
Balance at beginning of period $ 10,526 $ 16,198 $ 5,480
New loans purchased – Heartland acquisition     11,242
Accretion (8,579) (5,676) (1,393)
Disposals related to foreclosures     (3)
Other adjustments (including maturities, charge-offs and impact of changes in timing of expected cash flows) 915   608
Reclassification from (to) non-accretable 6,173 4 264
Balance at end of period $ 9,035 $ 10,526 $ 16,198