Consolidated Condensed Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	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, 2015		$ 0	$ 303,966	$ 507,505	$ (82,473)	$ (15,643)
Net Income	$ 18,686			18,686
Other comprehensive income, net of tax:
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes	11,680					11,680
Dividends on common shares at $0.94 per share				(14,487)
Cash payment for fractional shares in dividend reinvestment plan			(1)
Allocated Share-based Compensation Expense	468		468
Balance at Mar. 31, 2016		0	304,433	511,704	(82,473)	(3,963)
Balance at Dec. 31, 2016	742,240	0	305,826	535,631	(81,472)	(17,745)
Net Income	20,267			20,267
Other comprehensive income, net of tax:
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes	1,022					1,022
Dividends on common shares at $0.94 per share				(14,460)
Cash payment for fractional shares in dividend reinvestment plan			(1)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			(795)	(197)	(645)
Allocated Share-based Compensation Expense	826		826
Treasury Stock, Value, Acquired, Cost Method	(5,425)
Balance at Mar. 31, 2017	$ 744,122	$ 0	$ 305,856	$ 541,241	$ (86,252)	$ (16,723)