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Earnings Per Share (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
Antidilutive Securities Excluded from Computation of Earnings Per Share                      
Net income as reported $ 13,628 $ 11,832 $ 12,352 $ 11,025 $ 10,679 $ 9,709 $ 8,716 $ 9,346 $ 48,837 $ 38,450 $ 27,173
Impact of assumed conversions                      
Interest on 9% convertible trust preferred securities, net of income tax                 0 0 66
Net income available to common shareholders after assumed conversions                 $ 48,837 $ 38,450 $ 27,239
Weighted average common shares outstanding (in shares)                 20,003,000 19,984,000 19,761,000
Incremental shares from assumed conversions of convertible trust preferred securities (in shares)                 0 0 57,000
Additional dilutive common stock equivalents (in shares)                 287,000 333,000 292,000
Weighted average diluted common shares outstanding (in shares)                 20,290,000 20,317,000 20,110,000
Basic earnings per common share (in dollars per share) $ 0.68 $ 0.59 $ 0.62 $ 0.55 $ 0.53 $ 0.49 $ 0.44 $ 0.47 $ 2.44 $ 1.92 $ 1.38
Diluted earnings per common share (in dollars per share) $ 0.67 $ 0.59 $ 0.61 $ 0.54 $ 0.52 $ 0.48 $ 0.43 $ 0.46 $ 2.41 $ 1.89 $ 1.35
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)                 0 79,670 287,546
Convertible Debt Securities                      
Debt Instrument, Interest Rate, Stated Percentage [Abstract]                      
Convertible trust preferred securities, interest rate, stated percentage 9.00%       9.00%       9.00% 9.00% 9.00%