LOANS - Impaired Loans Individually Evaluated (excluding PCI loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Impaired loans (excluding PCI loans) by portfolio    
Difference between the recorded investment and unpaid principal balance $ 6,700 $ 5,200
Impaired | Non-PCI loans    
Impaired loans (excluding PCI loans) by portfolio    
With a valuation allowance, Recorded Investment 11,382 18,641
With a valuation allowance, Unpaid Principal Balance 12,228 22,523
With a valuation allowance, Average Annual Recorded Investment 11,774 19,994
With a related valuation allowance, Interest Income Recognized while on Impaired Status 358 283
With no related valuation allowance, Recorded Investment 20,221 6,250
With no related valuation allowance, Unpaid Principal Balance 26,113 7,610
With no related valuation allowance, Average Annual Recorded Investment 23,656 6,334
With no related valuation allowance, Interest Income Recognized while on Impaired Status 20 2
Total impaired loans 31,603 24,891
Total, Unpaid Principal Balance 38,341 30,133
Total, Related Valuation Allowance 2,182 2,994
Total, Average Annual Recorded Investment 35,430 26,328
Total, Interest Income Recognized While on Impaired Status 378 285
Commercial | Impaired | Commercial loan portfolio | Non-PCI loans    
Impaired loans (excluding PCI loans) by portfolio    
With a valuation allowance, Recorded Investment 3,877 5,789
With a valuation allowance, Unpaid Principal Balance 3,888 8,760
With a valuation allowance, Average Annual Recorded Investment 3,974 7,088
With a related valuation allowance, Interest Income Recognized while on Impaired Status 15  
With no related valuation allowance, Recorded Investment 2,671 781
With no related valuation allowance, Unpaid Principal Balance 7,567 781
With no related valuation allowance, Average Annual Recorded Investment 5,604 781
With no related valuation allowance, Interest Income Recognized while on Impaired Status 1  
Total impaired loans 6,548 6,570
Total, Unpaid Principal Balance 11,455 9,541
Total, Related Valuation Allowance 882 1,797
Total, Average Annual Recorded Investment 9,578 7,869
Total, Interest Income Recognized While on Impaired Status 16  
Non residential real estate | Impaired | Commercial loan portfolio | Non-PCI loans    
Impaired loans (excluding PCI loans) by portfolio    
With a valuation allowance, Recorded Investment 2,142 9,197
With a valuation allowance, Unpaid Principal Balance 2,331 9,489
With a valuation allowance, Average Annual Recorded Investment 2,379 9,225
With a related valuation allowance, Interest Income Recognized while on Impaired Status 306 267
With no related valuation allowance, Recorded Investment 16,256 4,520
With no related valuation allowance, Unpaid Principal Balance 17,058 5,840
With no related valuation allowance, Average Annual Recorded Investment 16,847 4,599
With no related valuation allowance, Interest Income Recognized while on Impaired Status 17  
Total impaired loans 18,398 13,717
Total, Unpaid Principal Balance 19,389 15,329
Total, Related Valuation Allowance 309 514
Total, Average Annual Recorded Investment 19,226 13,824
Total, Interest Income Recognized While on Impaired Status 323 267
Construction and land development | Impaired | Commercial loan portfolio | Non-PCI loans    
Impaired loans (excluding PCI loans) by portfolio    
With a valuation allowance, Recorded Investment 84  
With a valuation allowance, Unpaid Principal Balance 84 26
With a valuation allowance, Average Annual Recorded Investment 87  
With a related valuation allowance, Interest Income Recognized while on Impaired Status 7  
Total impaired loans 84  
Total, Unpaid Principal Balance 84 26
Total, Related Valuation Allowance 8  
Total, Average Annual Recorded Investment 87  
Total, Interest Income Recognized While on Impaired Status 7  
Residential real estate | Impaired | Other loan portfolio | Non-PCI loans    
Impaired loans (excluding PCI loans) by portfolio    
With a valuation allowance, Recorded Investment 3,735 3,206
With a valuation allowance, Unpaid Principal Balance 4,404 3,798
With a valuation allowance, Average Annual Recorded Investment 3,782 3,231
With a related valuation allowance, Interest Income Recognized while on Impaired Status 30 16
With no related valuation allowance, Recorded Investment 1,294 949
With no related valuation allowance, Unpaid Principal Balance 1,462 989
With no related valuation allowance, Average Annual Recorded Investment 1,179 954
With no related valuation allowance, Interest Income Recognized while on Impaired Status 2 2
Total impaired loans 5,029 4,155
Total, Unpaid Principal Balance 5,866 4,787
Total, Related Valuation Allowance 604 626
Total, Average Annual Recorded Investment 4,961 4,185
Total, Interest Income Recognized While on Impaired Status 32 18
Consumer | Impaired | Other loan portfolio | Non-PCI loans    
Impaired loans (excluding PCI loans) by portfolio    
With a valuation allowance, Recorded Investment 213 51
With a valuation allowance, Unpaid Principal Balance 190 52
With a valuation allowance, Average Annual Recorded Investment 221 52
With no related valuation allowance, Unpaid Principal Balance 26  
With no related valuation allowance, Average Annual Recorded Investment 26  
Total impaired loans 213 51
Total, Unpaid Principal Balance 216 52
Total, Related Valuation Allowance 23 7
Total, Average Annual Recorded Investment 247 52
Lease financing | Impaired | Other loan portfolio | Non-PCI loans    
Impaired loans (excluding PCI loans) by portfolio    
With a valuation allowance, Recorded Investment 1,331 398
With a valuation allowance, Unpaid Principal Balance 1,331 398
With a valuation allowance, Average Annual Recorded Investment 1,331 398
Total impaired loans 1,331 398
Total, Unpaid Principal Balance 1,331 398
Total, Related Valuation Allowance 356 50
Total, Average Annual Recorded Investment $ 1,331 $ 398