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Quarterly Financial Data (unaudited) (Tables)
12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
The following table is a summary of selected quarterly results of operations for the years ended December 31, 2019 and 2018.

Three Months Ended
(Dollars in thousands, except share data)March 31June 30Sept. 30Dec. 31
2019:
   Interest income$81,856  $92,226  $94,589  $91,829  
   Interest expense14,080  16,375  17,488  14,820  
   Net interest income67,776  75,851  77,101  77,009  
 Provision for (recovery of) loan losses 2,498  1,919  1,967  (213) 
   Income before income taxes30,476  26,548  37,532  30,215  
   Net income25,455  22,163  31,146  23,936  
   Per common share data:
      Net income per common share -  basic1.63  1.34  1.90  1.46  
      Net income per common share -  diluted1.62  1.33  1.89  1.45  
   Weighted-average common shares outstanding - basic15,651,541  16,560,545  16,382,798  16,342,485  
   Weighted-average common shares equivalent - diluted15,744,777  16,642,571  16,475,741  16,454,553  
2018:
   Interest income$73,714  $74,691  $80,229  $82,167  
   Interest expense8,864  9,949  12,553  12,537  
   Net interest income64,850  64,742  67,676  69,630  
 Provision for loan losses 260  1,386  2,940  3,359  
   Income before income taxes37,185  34,064  29,484  30,566  
   Net income31,123  28,241  24,762  26,261  
   Per common share data:
      Net income per common share -  basic2.04  1.85  1.58  1.67  
      Net income per common share -  diluted2.02  1.83  1.56  1.67  
   Weighted-average common shares outstanding - basic15,288,332  15,285,532  15,686,542  15,695,522  
   Weighted-average common shares equivalent - diluted15,431,625  15,417,607  15,832,734  15,764,548