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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Voting and Nonvoting Common Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of adoption of new accounting standards [1] $ 0   $ 1,063 $ (1,063)
Retained earnings 57,103      
Retained earnings | Accounting Standards Update 2018-02 1,100      
Retained earnings | Accounting Standards Update 2016-01 (100)      
Balance, beginning of period at Dec. 31, 2017 224,127 $ 172,043 57,103 (5,019)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 18,324   18,324  
Other comprehensive loss (8,365)     (8,365)
Dividends declared ($0.18 per share) (1,757)   (1,757)  
Net cash proceeds from common stock issuance 54,334 54,334    
Recognition of the fair value of share-based compensation 1,257 1,257    
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 30 30    
Common stock redeemed for the net settlement of share-based awards (210) (210)    
Balance, end of period at Sep. 30, 2018 287,740 $ 227,454 $ 74,733 $ (14,447)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Retained earnings $ 74,733      
[1] Represents the impact of adopting Accounting Standards Update (“ASU”) 2018-02 and ASU 2016-01. ASU 2018-02 increased retained earnings and accumulated other comprehensive loss by $1.1 million. ASU 2016-01 decreased retained earnings and accumulated other comprehensive loss by $0.1 million. See Note 12 to the condensed consolidated financial statements for more information.