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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Surplus
Retained Earnings
Other Comprehensive Income (Loss)
Treasury Stock
Total
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          
Increase (decrease) in shareholders' equity            
Net Income     106,307     106,307
Dividends:            
Cash ($.50 and $.33 per share) for the six month period ended June 30, 2019 and 2018, respectively)     (21,814)     (21,815)
Purchase of treasury stock (1,953, 1,298, 3,258 and 1,298 shares) for the three and six month periods ended June 30, 2019 and 2018, respectively)         (57) (57)
Exercise of stock options $ 47 770       818
Exercise of stock options (in shares) 47          
Stock compensation expense recognized in earnings   470       470
Other comprehensive income (loss), net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (44,973)   (44,973)
Balance at Jun. 30, 2018 $ 96,066 173,056 1,982,465 (79,537) (292,320) 1,879,730
Balance (in shares) at Jun. 30, 2018 96,066          
Balance at Mar. 31, 2018 $ 96,044 172,416 1,923,411 (68,350) (292,263) 1,831,258
Balance (in shares) at Mar. 31, 2018 96,044          
Increase (decrease) in shareholders' equity            
Net Income     52,887     52,887
Dividends:            
Purchase of treasury stock (1,953, 1,298, 3,258 and 1,298 shares) for the three and six month periods ended June 30, 2019 and 2018, respectively)         (57) (57)
Exercise of stock options $ 22 355       377
Exercise of stock options (in shares) 22          
Stock compensation expense recognized in earnings   285       285
Other comprehensive income (loss), net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       (5,020)   (5,020)
Balance at Jun. 30, 2018 $ 96,066 173,056 1,982,465 (79,537) (292,320) 1,879,730
Balance (in shares) at Jun. 30, 2018 96,066          
Dividends:            
Cumulative adjustment for adoption of new accounting standards     6,167 (6,167)    
Balance at Dec. 31, 2018 $ 96,104 145,283 2,064,134 (54,634) (311,305) 1,939,582
Balance (in shares) at Dec. 31, 2018 96,104          
Increase (decrease) in shareholders' equity            
Net Income     101,926     101,926
Dividends:            
Cash ($.50 and $.33 per share) for the six month period ended June 30, 2019 and 2018, respectively)     (32,821)     (32,821)
Purchase of treasury stock (1,953, 1,298, 3,258 and 1,298 shares) for the three and six month periods ended June 30, 2019 and 2018, respectively)         (128) (128)
Exercise of stock options $ 47 827       874
Exercise of stock options (in shares) 47          
Stock compensation expense recognized in earnings   504       504
Other comprehensive income (loss), net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       50,382   50,382
Balance at Jun. 30, 2019 $ 96,151 146,614 2,133,239 (4,252) (311,433) 2,060,319
Balance (in shares) at Jun. 30, 2019 96,151          
Balance at Mar. 31, 2019 $ 96,137 146,113 2,083,219 (29,405) (311,359) 1,984,705
Balance (in shares) at Mar. 31, 2019 96,137          
Increase (decrease) in shareholders' equity            
Net Income     50,020     50,020
Dividends:            
Purchase of treasury stock (1,953, 1,298, 3,258 and 1,298 shares) for the three and six month periods ended June 30, 2019 and 2018, respectively)         (74) (74)
Exercise of stock options $ 14 262       276
Exercise of stock options (in shares) 14          
Stock compensation expense recognized in earnings   239       239
Other comprehensive income (loss), net of tax:            
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments       25,153   25,153
Balance at Jun. 30, 2019 $ 96,151 $ 146,614 $ 2,133,239 $ (4,252) $ (311,433) $ 2,060,319
Balance (in shares) at Jun. 30, 2019 96,151