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Unaudited Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Interest and dividend income $ 51,936 $ 51,077 $ 50,417 $ 49,309 $ 48,565 $ 47,530 $ 46,423 $ 46,228 $ 202,739 $ 188,746 $ 184,493
Interest expense 5,562 5,760 5,510 5,271 5,128 5,144 5,093 5,000 22,103 20,365 20,683
Net Interest Income 46,374 45,317 44,907 44,038 43,437 42,386 41,330 41,228 180,636 168,381 163,810
Provision for loan and lease losses 1,706 782 978 855 1,533 281 922 209 4,321 2,945 2,306
Income before income tax expense 21,595 22,116 21,625 21,180 20,444 21,645 26,452 18,973 86,516 87,514 77,576
Net Income $ 15,118 $ 15,138 $ 14,833 $ 14,251 $ 13,854 $ 14,497 $ 17,390 $ 12,680 $ 59,340 $ 58,421 $ 52,041
Net income per common share (basic) (in dollars per share) $ 1.00 $ 1.01 $ 0.99 $ 0.95 $ 0.93 $ 0.97 $ 1.16 $ 0.85 $ 3.94 $ 3.91 $ 3.51
Net income per common share (diluted) (in dollars per share) $ 0.99 $ 1.00 $ 0.98 $ 0.94 $ 0.92 $ 0.96 $ 1.15 $ 0.84 $ 3.91 $ 3.87 $ 3.48