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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income per share calculations for basic and diluted methods        
Net income available to common stockholders $ 24,085 $ 24,862 $ 49,554 $ 46,779
Shares:        
Weighted average common shares outstanding 55,638,000 48,815,000 54,464,000 48,796,000
Dilutive effect of outstanding options, warrants and restricted stock units as determined by the application of the treasury stock method (in shares) 303,000 409,000 300,000 407,000
Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation 55,941,000 49,224,000 54,764,000 49,203,000
Basic earnings per common share (in dollars per share) $ 0.43 $ 0.51 $ 0.91 $ 0.96
Diluted earnings per common share (in dollars per share) $ 0.43 $ 0.51 $ 0.90 $ 0.95
Stock options        
Anti-dilutive securities excluded from the calculation of common stock equivalents        
Number of anti-dilutive securities (in shares)     48,107  
RSU        
Anti-dilutive securities excluded from the calculation of common stock equivalents        
Number of anti-dilutive securities (in shares)     169,258  
Warrants        
Anti-dilutive securities excluded from the calculation of common stock equivalents        
Number of anti-dilutive securities (in shares)     191,278 191,278