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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Series A 3% Preferred Stock [Member]	Series B-1 8.48% Preferred Stock [Member]	Preferred Equity [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Series A 3% Preferred Stock [Member]	Retained Earnings [Member] Series B-1 8.48% Preferred Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2017	$ 381,177			$ 17,329	$ 161	$ 121,058	$ 257,078			$ (11,916)	$ (2,533)
Comprehensive income:
Net income	9,288						9,288
Other comprehensive income (loss), net of tax	(6,247)									(6,247)
Purchases of common stock for treasury	(113)										(113)
Share-based compensation plans:
Share-based compensation	302					302
Stock options exercised	76					(1)					77
Restricted stock awards forfeited						446					(446)
Cash dividends declared:
Preferred stock dividends per share		$ (1)	$ (364)					$ (1)	$ (364)
Common stock dividends per share	(3,816)						(3,816)
Balance at Mar. 31, 2018	380,302			17,329	161	121,805	262,185			(18,163)	(3,015)
Cumulative-effect adjustment	(710)						(710)
Balance at Dec. 31, 2018	396,293			17,328	161	122,704	279,867			(21,281)	(2,486)
Adjusted Balance at Dec. 31, 2018	395,583			17,328	161	122,704	279,157			(21,281)	(2,486)
Comprehensive income:
Net income	11,521						11,521
Other comprehensive income (loss), net of tax	5,510									5,510
Reclassification of income tax effects							2,783			(2,783)
Purchases of common stock for treasury	(193)										(193)
Share-based compensation plans:
Share-based compensation	182					182
Restricted stock units released						(362)					362
Cash dividends declared:
Preferred stock dividends per share		$ (1)	$ (364)					$ (1)	$ (364)
Common stock dividends per share	(3,985)						(3,985)
Balance at Mar. 31, 2019	$ 408,253			$ 17,328	$ 161	$ 122,524	$ 289,111			$ (18,554)	$ (2,317)

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