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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Common Stock Shares Outstanding [Member]
Common Stock Amount Issued [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect of Change in Accounting Principle - Current Expected Credit Losses [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Treasury Stock [Member]
Deferred Compensation Arrangements [Member]
Total
Cumulative Effect of Change in Accounting Principle - Current Expected Credit Losses [Member]
Balance at Dec. 31, 2018   $ 51,577 $ 911,748 $ 795,563   $ (45,305) $ (11,528) $ 11,728 $ 1,713,783  
Balance (in shares) at Dec. 31, 2018 51,257,824                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income       41,946         41,946  
Other comprehensive income, net of tax           18,543     18,543  
Dividends declared:                    
Common       (19,576)         (19,576)  
Common stock activity under employee stock plans   151 (995)           (844)  
Common stock activity under employee stock plans (in shares) 150,919                  
Stock-based compensation     1,391           1,391  
Distribution of stock under deferred compensation arrangements     1,064       830 (1,894) 0  
Distribution of stock under deferred compensation arrangements (in shares) 32,431                  
Treasury stock issued to benefit plans, net     709       1,097 79 1,885  
Treasury stock issued to benefit plans, net (in shares) 30,197                  
Balance at Mar. 31, 2019   51,728 913,917 817,933   (26,762) (9,601) 9,913 1,757,128  
Balance (in shares) at Mar. 31, 2019 51,471,371                  
Balance at Dec. 31, 2019   51,975 927,337 882,851 $ 530 (10,226) (6,823) 10,120 1,855,234 $ 530
Balance (in shares) at Dec. 31, 2019 51,793,923                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income       40,134         40,134  
Other comprehensive income, net of tax           93,670     93,670  
Dividends declared:                    
Common       (21,367)         (21,367)  
Common stock activity under employee stock plans   215 6,184           6,399  
Common stock activity under employee stock plans (in shares) 214,588                  
Stock-based compensation     1,952           1,952  
Distribution of stock under deferred compensation arrangements     415       849 (1,264) 0  
Distribution of stock under deferred compensation arrangements (in shares) 22,497                  
Treasury stock issued to benefit plans, net     36       (31) 74 79  
Treasury stock issued to benefit plans, net (in shares) 84                  
Balance at Mar. 31, 2020   $ 52,190 $ 935,924 $ 902,148   $ 83,444 $ (6,005) $ 8,930 $ 1,976,631  
Balance (in shares) at Mar. 31, 2020 52,031,092