CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Retained Earnings	Cost of Common Stock in Treasury	Accumulated Other Comprehensive Income (Loss), Net
Balance at Dec. 31, 2012	$ 558,655	$ 0	$ 346,535	$ 223,715	$ (31,134)	$ 19,539
Increase (Decrease) in Stockholders' Equity
Net income	54,958	0	0	54,958	0	0
Other comprehensive income (loss)	(12,958)	0	0	0	0	(12,958)
Issuance of 118,281, 91,675, and 186,936 common shares under stock based compensation awards, including related tax effects for 2015, 2014 and 2013, respectively	3,655	0	0	(388)	4,043	0
Cost of 338,985, 597,747, and 99,064 shares of common stock acquired for treasury for 2015, 2014 and 2013, respectively	(2,273)	0	0	0	(2,273)	0
Common stock dividend ($0.671, $0.645 and $0.618 per share for 2015, 2014 and 2013, respectively)	(16,659)	0	0	(16,659)	0	0
Balance at Dec. 31, 2013	585,378	0	346,535	261,626	(29,364)	6,581
Increase (Decrease) in Stockholders' Equity
Net income	58,069	0	0	58,069	0	0
Other comprehensive income (loss)	2,826	0	0	0	0	2,826
Issuance of 118,281, 91,675, and 186,936 common shares under stock based compensation awards, including related tax effects for 2015, 2014 and 2013, respectively	1,752	0	0	(243)	1,995	0
Cost of 338,985, 597,747, and 99,064 shares of common stock acquired for treasury for 2015, 2014 and 2013, respectively	(16,342)	0	0	0	(16,342)	0
Common stock dividend ($0.671, $0.645 and $0.618 per share for 2015, 2014 and 2013, respectively)	(17,210)	0	0	(17,210)	0	0
Balance at Dec. 31, 2014	614,473	0	346,535	302,242	(43,711)	9,407
Increase (Decrease) in Stockholders' Equity
Net income	57,486	0	0	57,486	0	0
Other comprehensive income (loss)	(2,852)	0	0	0	0	(2,852)
Issuance of 118,281, 91,675, and 186,936 common shares under stock based compensation awards, including related tax effects for 2015, 2014 and 2013, respectively	2,584	0	0	(245)	2,829	0
Cost of 338,985, 597,747, and 99,064 shares of common stock acquired for treasury for 2015, 2014 and 2013, respectively	(9,970)	0	0	0	(9,970)	0
Common stock dividend ($0.671, $0.645 and $0.618 per share for 2015, 2014 and 2013, respectively)	(17,655)	0	0	(17,655)	0	0
10% common stock dividend ($13 cash paid in lieu of fractional shares)	(13)	0	90,003	(90,016)	0	0
Balance at Dec. 31, 2015	$ 644,053	$ 0	$ 436,538	$ 251,812	$ (50,852)	$ 6,555