Consolidated Condensed Statements Of Changes In Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Treasury Stock At Cost [Member]	Accumulated Other Comprehensive Income (loss) [Member]
Balance at Dec. 31, 2013		$ 0	$ 302,651	$ 460,643	$ (76,128)	$ (35,419)
Net Income	19,577			19,577
Other comprehensive income, net of tax:
Unrealized net holding gain on securities available-for-sale, net of income taxes	10,941					10,941
Cash dividends on common stock at $0.94 per share				(14,488)
Cash payment for fractional shares in dividend reinvestment plan			(1)
Allocated Share-based Compensation Expense	103		103
Treasury Stock, Value, Acquired, Cost Method					(1,485)
Balance at Mar. 31, 2014		0	302,753	463,808	(77,613)	(24,478)
Balance at Dec. 31, 2014	696,541	0	303,104	486,541	(77,439)	(13,608)
Net Income	19,044			19,044
Other comprehensive income, net of tax:
Unrealized net holding gain on securities available-for-sale, net of income taxes	7,859					7,859
Cash dividends on common stock at $0.94 per share				(14,488)
Cash payment for fractional shares in dividend reinvestment plan			(1)
Allocated Share-based Compensation Expense	259		259
Treasury Stock, Value, Acquired, Cost Method					(1,783)
Balance at Mar. 31, 2015	$ 707,431	$ 0	$ 303,362	$ 489,040	$ (79,222)	$ (5,749)