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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Series A 3% Preferred Stock [Member]
Retained Earnings [Member]
Series A 3% Preferred Stock [Member]
Series B-1 8.48% Preferred Stock [Member]
Retained Earnings [Member]
Series B-1 8.48% Preferred Stock [Member]
Preferred Equity [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2014         $ 17,340 $ 144 $ 72,955 $ 203,312 $ (9,011) $ (5,208) $ 279,532
Comprehensive income:                      
Net income               28,337     28,337
Other comprehensive income, net of tax                 (2,316)   (2,316)
Purchases of common stock for treasury                   (202) (202)
Share-based compensation plans:                      
Share-based compensation             674       674
Stock options exercised             6     353 359
Restricted stock awards issued, net             (1,052)     1,052  
Excess tax benefit             79       79
Stock awards             28     82 110
Cash dividends declared:                      
Preferred stock dividends per share $ (4) $ (4) $ (1,458) $ (1,458)              
Common stock dividends per share               (11,267)     (11,267)
Balance at Dec. 31, 2015         17,340 144 72,690 218,920 (11,327) (3,923) 293,844
Comprehensive income:                      
Net income               31,931     31,931
Other comprehensive income, net of tax                 (2,624)   (2,624)
Common stock issued           3 8,097       8,100
Share-based compensation plans:                      
Share-based compensation             845       845
Stock options exercised             23     941 964
Restricted stock awards issued, net             24     (24)  
Excess tax benefit             30       30
Stock awards             46     82 128
Cash dividends declared:                      
Preferred stock dividends per share (4) (4) (1,458) (1,458)              
Common stock dividends per share               (11,702)     (11,702)
Balance at Dec. 31, 2016         17,340 147 81,755 237,687 (13,951) (2,924) 320,054
Cumulative-effect adjustment             (279) 279      
Adjusted Balance at Dec. 31, 2016         17,340 147 81,476 237,966 (13,951) (2,924) 320,054
Comprehensive income:                      
Net income               33,526     33,526
Other comprehensive income, net of tax                 2,035   2,035
Common stock issued           14 38,289       38,303
Purchases of common stock for treasury                   (148) (148)
Repurchase of Series A 3% preferred stock         (5)   2       (3)
Repurchase of Series B-1 8.48% preferred stock         (6)           (6)
Share-based compensation plans:                      
Share-based compensation             1,174       1,174
Stock options exercised             5     408 413
Restricted stock awards issued, net             21     (21)  
Stock awards             91     152 243
Cash dividends declared:                      
Preferred stock dividends per share $ (4) $ (4) $ (1,458) $ (1,458)              
Common stock dividends per share               (12,952)     (12,952)
Balance at Dec. 31, 2017         $ 17,329 $ 161 $ 121,058 $ 257,078 $ (11,916) $ (2,533) $ 381,177