Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - BASIC AND DILUTED EARNINGS PER SHARE (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - BASIC AND DILUTED EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accounting Policies [Abstract]        
Document Period End Date     Sep. 30, 2016  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     42,506  
Net income available to common stockholders $ 12,557 $ 14,531 $ 36,038 $ 33,542
Net income allocated to common stockholders (in shares) 11,209,000 12,239,000 11,437,000 12,364,000
Net income allocated to common stockholders (in dollars per share) $ 1.12 $ 1.19 $ 3.15 $ 2.71
Warrants to purchase common stock (in shares)     0 27,000
Non-vested restricted stock (in shares) 23,000 45,000 26,000 48,000
Net income allocated to common stockholders plus assumed conversions $ 12,557 $ 14,531 $ 36,038 $ 33,542
Net income allocated to common stockholders plus assumed conversions (in shares) 11,232,000 12,284,000 11,463,000 12,439,000
Net income allocated to common stockholders plus assumed conversions (in dollars per share) $ 1.12 $ 1.18 $ 3.14 $ 2.70