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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, 2018   $ 92,000 $ 59,885 $ 619,381 $ 90,167 $ 253,040   $ 252,304 $ (103,633) $ (10,963)
Beginning Balance (Topic 842 Adoption [Member]) at Dec. 31, 2018             $ (736)      
Beginning Balance (Topic 326 [Member]) at Dec. 31, 2018             0      
Stock-based compensation expense       1,567            
Lapsed restricted stock units and options       0         697  
Net income $ 54,832         54,832        
Cash dividends declared on common stock           (10,782)        
Cash dividends declared on preferred stock           (4,884)        
Transfer from retained earnings         5,616          
Transfer to legal surplus           (5,616)        
Stock repurchased 0               0  
Other comprehensive income, net of tax 8,505                 8,505
Ending Balance at Sep. 30, 2019 1,049,076 92,000 59,885 620,948 95,783 285,854     (102,936) (2,458)
Beginning Balance at Jun. 30, 2019   92,000 59,885 620,368 95,019 284,459   284,459 (103,171) (3,686)
Beginning Balance (Topic 842 Adoption [Member]) at Jun. 30, 2019             0      
Beginning Balance (Topic 326 [Member]) at Jun. 30, 2019             0      
Stock-based compensation expense       580            
Lapsed restricted stock units and options       0         235  
Net income 7,383         7,383        
Cash dividends declared on common stock           (3,596)        
Cash dividends declared on preferred stock           (1,628)        
Transfer from retained earnings         764          
Transfer to legal surplus           (764)        
Stock repurchased                 0  
Other comprehensive income, net of tax 1,228                 1,228
Ending Balance at Sep. 30, 2019 1,049,076 92,000 59,885 620,948 95,783 285,854     (102,936) (2,458)
Beginning Balance at Dec. 31, 2019 1,045,478 92,000 59,885 621,515 95,779 279,646   254,152 (102,339) (1,008)
Beginning Balance (Topic 842 Adoption [Member]) at Dec. 31, 2019             0      
Beginning Balance (Topic 326 [Member]) at Dec. 31, 2019             (25,494)      
Stock-based compensation expense       1,468            
Lapsed restricted stock units and options       (1,005)         1,470  
Net income 51,026         51,026        
Cash dividends declared on common stock           (10,787)        
Cash dividends declared on preferred stock           (4,884)        
Transfer from retained earnings         5,454          
Transfer to legal surplus           (5,454)        
Stock repurchased (2,226)               (2,226)  
Other comprehensive income, net of tax 9,276                 9,276
Ending Balance at Sep. 30, 2020 1,064,322 92,000 59,885 621,978 101,233 284,053     (103,095) 8,268
Beginning Balance at Jun. 30, 2020   92,000 59,885 621,860 98,347 264,724   $ 264,724 (103,121) 7,588
Beginning Balance (Topic 842 Adoption [Member]) at Jun. 30, 2020             0      
Beginning Balance (Topic 326 [Member]) at Jun. 30, 2020             $ 0      
Stock-based compensation expense       144            
Lapsed restricted stock units and options       (26)         26  
Net income 27,438         27,438        
Cash dividends declared on common stock           (3,595)        
Cash dividends declared on preferred stock           (1,628)        
Transfer from retained earnings         2,886          
Transfer to legal surplus           (2,886)        
Stock repurchased                 0  
Other comprehensive income, net of tax 680                 680
Ending Balance at Sep. 30, 2020 $ 1,064,322 $ 92,000 $ 59,885 $ 621,978 $ 101,233 $ 284,053     $ (103,095) $ 8,268