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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Total
Balance at Dec. 31, 2014   $ 95,784 $ 165,520 $ 1,585,389 $ 11,397 $ (277,432) $ 1,580,658
Balance (in shares) at Dec. 31, 2014 95,784            
Increase (decrease) in shareholders' equity              
Net Income       136,726     136,726
Dividends:              
Cash ($.66, $.60 and $.58 per share) for the year ended December 31, 2017, 2016 and 2015, respectively)       (38,515)     (38,515)
Purchase of treasury stock (4,870, 349,029 and 261,079 shares) for the years ended December 31, 2017, 2016 and 2015, respectively)           (6,678) (6,678)
Exercise of stock options   82 1,288       1,370
Options exercised (in shares) 82            
Stock compensation expense recognized in earnings     1,172       1,172
Other comprehensive income, net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         (9,230)   (9,230)
Balance at Dec. 31, 2015   95,866 167,980 1,683,600 2,167 (284,110) 1,665,503
Balance (in shares) at Dec. 31, 2015 95,866            
Increase (decrease) in shareholders' equity              
Net Income       133,932     133,932
Dividends:              
Cash ($.66, $.60 and $.58 per share) for the year ended December 31, 2017, 2016 and 2015, respectively)       (39,569)     (39,569)
Purchase of treasury stock (4,870, 349,029 and 261,079 shares) for the years ended December 31, 2017, 2016 and 2015, respectively)           (7,966) (7,966)
Exercise of stock options   44 505       549
Options exercised (in shares) 44            
Stock compensation expense recognized in earnings     1,082       1,082
Other comprehensive income, net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         (28,864)   (28,864)
Balance at Dec. 31, 2016   95,910 169,567 1,777,963 (26,697) (292,076) 1,724,667
Balance (in shares) at Dec. 31, 2016 95,910            
Increase (decrease) in shareholders' equity              
Net Income       157,436     157,436
Dividends:              
Cash ($.66, $.60 and $.58 per share) for the year ended December 31, 2017, 2016 and 2015, respectively)       (43,594)     (43,594)
Purchase of treasury stock (4,870, 349,029 and 261,079 shares) for the years ended December 31, 2017, 2016 and 2015, respectively)           (187) (187)
Exercise of stock options   109 1,346       1,455
Options exercised (in shares) 109            
Stock compensation expense recognized in earnings     903       903
Other comprehensive income, net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments         (1,700)   (1,700)
Balance at Dec. 31, 2017   $ 96,019 $ 171,816 $ 1,891,805 $ (28,397) $ (292,263) $ 1,838,980
Balance (in shares) at Dec. 31, 2017 96,019