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Summarized Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 44,348 $ 42,729 $ 39,180 $ 37,644 $ 37,053 $ 36,366 $ 35,298 $ 34,214 $ 163,901 $ 142,930 $ 132,152
Taxable equivalent adjustment (194) (187) (187) (187) (371) (358) (370) (357)      
Interest income (FTE) 44,542 42,916 39,367 37,831 37,424 36,724 35,668 34,571      
Interest expense 7,917 7,171 5,607 4,997 4,664 4,340 4,036 3,767 25,692 16,805 13,207
Net Interest Income 36,625 35,745 33,760 32,834 32,760 32,384 31,632 30,804      
Provision for loan losses (400) (27) (2,064) 181 422 1,393 510 681 (2,310) 3,006 4,395
Investment securities gains (losses)         200 0 0 4,276      
Equity Securities, FV-NI, Unrealized Gain (Loss) (1,246) 384 492 280         (90)    
Noninterest income 15,952 15,369 15,119 14,212 15,367 14,611 14,921 14,231 60,564 63,607 58,825
Noninterest expense 38,178 25,040 24,911 24,937 22,893 24,309 24,176 24,600 113,066 95,981 96,164
Income before income tax expense 13,553 26,485 26,524 22,208 25,012 21,293 21,867 24,030 88,017 90,745 77,211
Income tax expense 2,646 5,606 5,358 4,405 14,972 7,003 6,812 7,647 18,015 36,435 25,083
Interest Income Taxable Equivalent Adjustment - Tax 194 187 187 187 371 358 370 357      
Net Income Available to Common Shareholders 10,713 20,692 20,979 17,616 9,669 13,932 14,685 16,026 70,002 54,310 52,128
Net earnings allocated to common shareholders $ 10,623 $ 20,491 $ 20,768 $ 17,421 $ 9,560 $ 13,778 $ 14,531 $ 15,849 $ 69,348 $ 53,719 $ 51,505
Basic earnings per common share $ 0.68 $ 1.34 $ 1.36 $ 1.13 $ 0.62 $ 0.89 $ 0.94 $ 1.04 $ 4.50 $ 3.49 $ 3.46
Diluted earnings per common share $ 0.68 $ 1.33 $ 1.35 $ 1.13 $ 0.62 $ 0.89 $ 0.94 $ 1.04 $ 4.49 $ 3.48 $ 3.45
Basic 15,603 15,340 15,326 15,414 15,472 15,485 15,462 15,252 15,421 15,412 14,900
Average shares outstanding, diluted 15,618 15,358 15,345 15,436 15,497 15,505 15,487 15,277 15,439 15,436 14,913