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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Cumulative Effect Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect Adjustment [Member]
Common Stock Outstanding [Member]
Common Stock Amount Issued [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Treasury Stock [Member]
Deferred Compensation Arrangements [Member]
Total
Balance at Dec. 31, 2019       $ 51,975 $ 927,337 $ 882,851 $ (10,226) $ (6,823) $ 10,120 $ 1,855,234
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 (loss), 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 (ASU 2016-13 [Member]) at Mar. 31, 2020 $ 530 $ 530                
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              
Balance at Dec. 31, 2020       53,755 1,025,163 960,183 62,077 (6,198) 9,127 2,104,107
Balance (in shares) at Dec. 31, 2020     53,593,127              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income           52,850       52,850
Other comprehensive income (loss), net of tax             (172,034)     (172,034)
Dividends declared:                    
Common           (22,529)       (22,529)
Common stock activity under employee stock plans       264 7,065         7,329
Common stock activity under employee stock plans (in shares)     264,775              
Stock-based compensation         1,674         1,674
Distribution of stock under deferred compensation arrangements         323     694 (1,017) 0
Distribution of stock under deferred compensation arrangements (in shares)     18,089              
Treasury stock issued to benefit plans, net               (68) 68 0
Treasury stock issued to benefit plans, net (in shares)     1,012              
Balance at Mar. 31, 2021       $ 54,019 $ 1,034,225 $ 990,504 $ (109,957) $ (5,572) $ 8,178 $ 1,971,397
Balance (in shares) at Mar. 31, 2021     53,874,979