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Selected Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 67,855 $ 66,723 $ 64,914 $ 61,150 $ 59,096 $ 57,808 $ 55,850 $ 55,019 $ 260,642 $ 227,774 $ 203,548
Interest expense 10,027 9,267 8,344 7,272 6,638 6,353 6,142 5,382 34,909 24,515 15,997
Provision for loan losses 982 2,850 4,869 5,183 5,586 2,516 4,848 5,014 13,883 17,965 10,388
Net Interest Income After Provision for Loan Losses 56,846 54,606 51,701 48,695 46,872 48,939 44,860 44,623 211,850 185,294 177,163
Security (losses) gains, net (986) 0 3,617 370 0 0 0 0      
Noninterest income 13,636 13,551 12,648 12,626 12,922 13,448 12,448 15,817 55,462 54,635 51,033
Noninterest expense 37,947 36,553 36,597 36,808 35,625 34,439 34,753 38,416 147,907 143,232 136,717
Income Before Taxes 31,549 31,604 31,369 24,883 24,169 27,948 22,555 22,024      
Provision for income taxes 22,255 8,883 8,604 6,695 6,510 7,367 5,496 5,931 46,437 25,305 24,398
Net Income Allocated to Common Shareholders $ 9,294 $ 22,721 $ 22,765 $ 18,188 $ 17,659 $ 20,581 $ 17,059 $ 16,093 $ 72,726 $ 71,167 $ 66,801
Per Share Data                      
Common earnings per share-diluted (in USD per share) $ 0.27 $ 0.65 $ 0.65 $ 0.52 $ 0.51 $ 0.59 $ 0.49 $ 0.46 $ 2.09 $ 2.05 $ 1.98
Dividends declared per common share (in USD per share) 0.22 0.20 0.20 0.20 0.20 0.19 0.19 0.19 $ 0.82 $ 0.77 $ 0.73
Common book value (in USD per share) $ 25.28 $ 25.37 $ 24.90 $ 24.45 $ 24.12 $ 24.02 $ 23.63 $ 23.23