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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       987            
Lapsed restricted stock units and options       0         462  
Net income $ 47,449         47,449        
Cash dividends declared on common stock           (7,186)        
Cash dividends declared on preferred stock           (3,256)        
Transfer from retained earnings         4,852          
Transfer to legal surplus           (4,852)        
Stock repurchased 0               0  
Other comprehensive income, net of tax 7,277                 7,277
Ending Balance at Jun. 30, 2019 1,044,874 92,000 59,885 620,368 95,019 284,459     (103,171) (3,686)
Beginning Balance at Mar. 31, 2019   92,000 59,885 619,828 92,621 268,101   268,101 (103,196) (8,047)
Beginning Balance (Topic 842 Adoption [Member]) at Mar. 31, 2019             0      
Beginning Balance (Topic 326 [Member]) at Mar. 31, 2019             0      
Stock-based compensation expense       540            
Lapsed restricted stock units and options       0         25  
Net income 23,979         23,979        
Cash dividends declared on common stock           (3,595)        
Cash dividends declared on preferred stock           (1,628)        
Transfer from retained earnings         2,398          
Transfer to legal surplus           (2,398)        
Stock repurchased                 0  
Other comprehensive income, net of tax 4,361                 4,361
Ending Balance at Jun. 30, 2019 1,044,874 92,000 59,885 620,368 95,019 284,459     (103,171) (3,686)
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       1,323            
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)        
Stock repurchased (2,226)               (2,226)  
Other comprehensive income, 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 842 Adoption [Member]) at Mar. 31, 2020             0      
Beginning Balance (Topic 326 [Member]) at Mar. 31, 2020             $ 0      
Stock-based compensation expense       822            
Lapsed restricted stock units and options       (168)         168  
Net income 21,787         21,787        
Cash dividends declared on common stock           (3,588)        
Cash dividends declared on preferred stock           (1,628)        
Transfer from retained earnings         2,402          
Transfer to legal surplus           (2,403)        
Stock repurchased                 0  
Other comprehensive income, 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