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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Voting and Nonvoting Common Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Balance, beginning of period at Dec. 31, 2019 $ 304,913 $ 219,423 $ 99,681 $ (14,191)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 18,362   18,362  
Other comprehensive income (loss) (4,899)     (4,899)
Dividends declared (1,802)   (1,802)  
Recognition of the fair value of share-based compensation 1,600 1,600    
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 21 21    
Common stock redeemed for the net settlement of share-based awards (93) (93)    
Balance, end of period at Sep. 30, 2020 318,102 220,951 116,241 (19,090)
Balance, beginning of period at Jun. 30, 2020 307,711 220,418 108,431 (21,138)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 8,411   8,411  
Other comprehensive income (loss) 2,048     2,048
Dividends declared (601)   (601)  
Recognition of the fair value of share-based compensation 527 527    
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 6 6    
Balance, end of period at Sep. 30, 2020 318,102 220,951 116,241 (19,090)
Balance, beginning of period at Dec. 31, 2020 330,944 221,408 126,732 (17,196)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 35,636   35,636  
Other comprehensive income (loss) 4,028     4,028
Dividends declared (1,817)   (1,817)  
Recognition of the fair value of share-based compensation 1,830 1,830    
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 16 16    
Common stock redeemed for the net settlement of share-based awards (195) (195)    
Balance, end of period at Sep. 30, 2021 370,442 223,059 160,551 (13,168)
Balance, beginning of period at Jun. 30, 2021 358,641 222,486 149,066 (12,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 12,090   12,090  
Other comprehensive income (loss) (257)     (257)
Dividends declared (605)   (605)  
Recognition of the fair value of share-based compensation 568 568    
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 5 5    
Balance, end of period at Sep. 30, 2021 $ 370,442 $ 223,059 $ 160,551 $ (13,168)