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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Legal Surplus [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period Of Adoption, Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect, Period Of Adoption, Adjusted Balance [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Member]
Beginning Balance at Dec. 31, 2019   $ 92,000 $ 59,885 $ 621,515 $ 95,779 $ 279,646   $ 254,152 $ (102,339) $ (1,008)
Beginning Balance (Topic 326 [Member]) at Dec. 31, 2019             $ (25,494)      
Redemption of preferred stock   0                
Redemption of preferred stock and issuance cost       0   0        
Stock-based compensation expense       1,323            
Stock repurchased $ (2,226)               (2,226)  
Lapsed restricted stock units and options       (978)         1,444  
Net income 23,588         23,588        
Cash dividends declared on common stock           (7,191)        
Cash dividends declared on preferred stock           (3,256)        
Transfer from retained earnings         2,568          
Transfer to legal surplus           (2,568)        
Other comprehensive income (loss), net of tax 8,596                 8,596
Ending Balance at Jun. 30, 2020 1,041,284 92,000 59,885 621,860 98,347 264,725     (103,121) 7,588
Beginning Balance at Mar. 31, 2020   92,000 59,885 621,206 95,945 250,557   250,557 (103,289) 6,290
Beginning Balance (Topic 326 [Member]) at Mar. 31, 2020             0      
Redemption of preferred stock   0                
Redemption of preferred stock and issuance cost       0   0        
Stock-based compensation expense       822            
Stock repurchased                 0  
Lapsed restricted stock units and options       (168)         168  
Net income 21,787         21,787        
Cash dividends declared on common stock [1]           (3,588)        
Cash dividends declared on preferred stock           (1,628)        
Transfer from retained earnings         2,402          
Transfer to legal surplus           (2,403)        
Other comprehensive income (loss), net of tax 1,298                 1,298
Ending Balance at Jun. 30, 2020 1,041,284 92,000 59,885 621,860 98,347 264,725     (103,121) 7,588
Beginning Balance at Dec. 31, 2020 1,085,975 92,000 59,885 622,652 103,269 300,096   300,096 (102,949) 11,022
Beginning Balance (Topic 326 [Member]) at Dec. 31, 2020             0      
Redemption of preferred stock   (68,000)                
Redemption of preferred stock and issuance cost       2,677   (2,677)        
Stock-based compensation expense       3,614            
Stock repurchased 0               0  
Lapsed restricted stock units and options       (1,948)         2,230  
Net income 71,200         71,200        
Cash dividends declared on common stock           (8,397)        
Cash dividends declared on preferred stock           (1,255)        
Transfer from retained earnings         6,966          
Transfer to legal surplus           (6,966)        
Other comprehensive income (loss), net of tax (3,422)                 (3,422)
Ending Balance at Jun. 30, 2021 1,079,997 24,000 59,885 626,995 110,235 352,001     (100,719) 7,600
Beginning Balance at Mar. 31, 2021   92,000 59,885 622,935 106,165 322,202   $ 322,202 (100,994) 6,230
Beginning Balance (Topic 326 [Member]) at Mar. 31, 2021             $ 0      
Redemption of preferred stock   (68,000)                
Redemption of preferred stock and issuance cost       2,677   (2,677)        
Stock-based compensation expense       1,405            
Stock repurchased                 0  
Lapsed restricted stock units and options       (22)         275  
Net income 40,827         40,827        
Cash dividends declared on common stock [1]           (4,281)        
Cash dividends declared on preferred stock           0        
Transfer from retained earnings         4,070          
Transfer to legal surplus           (4,070)        
Other comprehensive income (loss), net of tax 1,370                 1,370
Ending Balance at Jun. 30, 2021 $ 1,079,997 $ 24,000 $ 59,885 $ 626,995 $ 110,235 $ 352,001     $ (100,719) $ 7,600
[1] [1] Dividends declared per common share during the quarter ended June 30, 2021- $0.08 (June 30, 2020 - $0.07). Dividends declared per common share during the six-month period ended June 30, 2021 - $0.16 (June 30, 2020 - $0.14).