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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income as reported	$ 12,391	$ 11,025
Impact of assumed conversions
Weighted average common shares outstanding (in shares)	21,928,000	20,004,000
Additional dilutive common stock equivalents (in shares)	381,000	229,000
Weighted average diluted common shares outstanding (in shares)	22,309,000	20,233,000
Basic earnings per common share (in dollars per share)	$ 0.57	$ 0.55
Diluted earnings per common share (in dollars per share)	$ 0.56	$ 0.54
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)	2,900	88,040
Convertible Debt Securities
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Convertible trust preferred securities, interest rate, stated percentage	9.00%	9.00%

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Contractual interest rate for funds borrowed, under the debt agreement.

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