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Earnings Per Common Share (Summary Of Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Income available to common shareholders	$ 19,032	$ 19,998	$ 39,299	$ 38,684
Denominator for basic earnings per share (weighted average common shares outstanding)	15,297,085	15,330,802	15,304,572	15,330,808
Effect of dilutive options and warrants	101,780	68,481	111,193	72,088
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	15,398,865	15,399,283	15,415,765	15,402,896
Basic earnings per common share	$ 1.24	$ 1.30	$ 2.57	$ 2.52
Diluted earnings per common share	$ 1.24	$ 1.30	$ 2.55	$ 2.51

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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