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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Revision of Prior Period, Accounting Standards Update, Adjustment
Additional Paid-in Capital
Retained Earnings
Retained Earnings
Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Other Comprehensive Income
Beginning Balances at Dec. 31, 2019 $ 656,023 $ (15,635) $ 379,853 $ 269,738 $ (15,635) $ 6,432
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 26,294     26,294    
Other comprehensive income (loss), net of tax 14,838         14,838
Amortization of unearned compensation 122   122      
Exercise of stock options 157   157      
Stock option expense 77   77      
Stock issued stock plans 514   514      
Repurchase of outstanding stock (19,636)   (19,636)      
Cash dividends on common stock (10,548)     (10,548)    
Ending Balances at Jun. 30, 2020 $ 652,206   361,087 269,849   21,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Accounting Standards Update us-gaap:AccountingStandardsUpdate201613Member          
Beginning Balances at Mar. 31, 2020 $ 630,842   361,019 260,501   9,322
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 14,639     14,639    
Other comprehensive income (loss), net of tax 11,948         11,948
Amortization of unearned compensation (79)   (79)      
Exercise of stock options (98)   (98)      
Stock option expense 27   27      
Stock issued stock plans 218   218      
Cash dividends on common stock (5,291)     (5,291)    
Ending Balances at Jun. 30, 2020 652,206   361,087 269,849   21,270
Beginning Balances at Dec. 31, 2020 692,216   362,945 301,419   27,852
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 42,595     42,595    
Other comprehensive income (loss), net of tax (9,214)         (9,214)
Amortization of unearned compensation 784   784      
Exercise of stock options 769   769      
Stock option expense 42   42      
Stock issued stock plans (1,347)   (1,347)      
Stock retirement plans (3,966)   (3,966)      
Cash dividends on common stock (11,505)     (11,505)    
Ending Balances at Jun. 30, 2021 710,374   359,227 332,509   18,638
Beginning Balances at Mar. 31, 2021 689,379   362,613 316,080   10,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 22,173     22,173    
Other comprehensive income (loss), net of tax 7,952         7,952
Amortization of unearned compensation 449   449      
Exercise of stock options 116   116      
Stock option expense 15   15      
Stock retirement plans (3,966)   (3,966)      
Cash dividends on common stock (5,744)     (5,744)    
Ending Balances at Jun. 30, 2021 $ 710,374   $ 359,227 $ 332,509   $ 18,638