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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, 2017   $ 176,000 $ 52,626 $ 541,600 $ 81,454 $ 200,878   $ 200,878 $ (104,502) $ (2,949)
Beginning Balance (Topic 842 Adoption [Member]) at Dec. 31, 2017             $ 0      
Beginning Balance (Topic 326 [Member]) at Dec. 31, 2017             0      
Conversion of convertible preferred stock to common stock   (84,000) 7,259 76,741            
Stock-based compensation expense       1,401            
Lapsed restricted stock units and options       (361)         869  
Net income $ 84,410         84,410        
Cash dividends declared on common stock [1]           (11,511)        
Cash dividends declared on preferred stock           (12,024)        
Transfer from retained earnings         8,713          
Transfer to legal surplus           (8,713)        
Stock repurchased 0               0  
Other comprehensive income (loss), net of tax (8,014)                 (8,014)
Ending Balance at Dec. 31, 2018 999,877 92,000 59,885 619,381 90,167 253,040   252,304 (103,633) (10,963)
Ending Balance (Topic 842 Adoption [Member]) at Dec. 31, 2018             (736)      
Ending Balance (Topic 326 [Member]) at Dec. 31, 2018             0      
Stock-based compensation expense       2,134            
Lapsed restricted stock units and options       0         1,294  
Net income 53,841         53,841        
Cash dividends declared on common stock [1]           (14,375)        
Cash dividends declared on preferred stock           (6,512)        
Transfer from retained earnings         5,612          
Transfer to legal surplus           (5,612)        
Stock repurchased 0               0  
Other comprehensive income (loss), net of tax 9,955                 9,955
Ending Balance at Dec. 31, 2019 1,045,478 92,000 59,885 621,515 95,779 279,646   $ 254,152 (102,339) (1,008)
Ending Balance (Topic 842 Adoption [Member]) at Dec. 31, 2019             0      
Ending Balance (Topic 326 [Member]) at Dec. 31, 2019             $ (25,494)      
Stock-based compensation expense       2,170            
Lapsed restricted stock units and options       (1,033)         1,616  
Net income 74,327         74,327        
Cash dividends declared on common stock [1]           (14,381)        
Cash dividends declared on preferred stock           (6,512)        
Transfer from retained earnings         7,490          
Transfer to legal surplus           (7,490)        
Stock repurchased (2,226)               (2,226)  
Other comprehensive income (loss), net of tax 12,030                 12,030
Ending Balance at Dec. 31, 2020 $ 1,085,975 $ 92,000 $ 59,885 $ 622,652 $ 103,269 $ 300,096     $ (102,949) $ 11,022
[1] [1] Dividends declared per common share during the year ended December 31, 2020 - $0.28 (2019 - $0.28; 2018 - $0.25).