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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
Total
Series A 3% Preferred Stock [Member]
Series B-1 8.48% Preferred Stock [Member]
Cumulative-Effect Adjustment [Member]
Adjusted Balance [Member]
Preferred Equity [Member]
Preferred Equity [Member]
Adjusted Balance [Member]
Common Stock [Member]
Common Stock [Member]
Adjusted Balance [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Adjusted Balance [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Series A 3% Preferred Stock [Member]
Retained Earnings [Member]
Series B-1 8.48% Preferred Stock [Member]
Retained Earnings [Member]
Cumulative-Effect Adjustment [Member]
Retained Earnings [Member]
Adjusted Balance [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Loss [Member]
Adjusted Balance [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Adjusted Balance [Member]
Balance at Dec. 31, 2019 $ 438,947,000     $ (8,719,000) $ 430,228,000 $ 17,328,000 $ 17,328,000 $ 161,000 $ 161,000 $ 124,582,000 $ 124,582,000 $ 313,364,000     $ (8,719,000) $ 304,645,000 $ (14,513,000) $ (14,513,000) $ (1,975,000) $ (1,975,000)
Comprehensive income:                                        
Net income 38,332,000                     38,332,000                
Other comprehensive income (loss), net of tax 16,641,000                               16,641,000      
Purchase of common stock for treasury (209,000)                                   (209,000)  
Share-based compensation plans:                                        
Share-based compensation 1,333,000                 1,333,000                    
Restricted stock units released                   (511,000)                 511,000  
Restricted stock awards issued, net                   (272,000)                 272,000  
Stock awards 165,000                 (14,000)                 179,000  
Cash dividends declared:                                        
Preferred stock dividends per share   $ (4,000) $ (1,457,000)                   $ (4,000) $ (1,457,000)            
Common stock dividends per share (16,666,000)                     (16,666,000)                
Balance at Dec. 31, 2020 468,363,000         17,328,000   161,000   125,118,000   324,850,000         2,128,000   (1,222,000)  
Comprehensive income:                                        
Net income 77,697,000                     77,697,000                
Other comprehensive income (loss), net of tax (15,335,000)                               (15,335,000)      
Common stock issued 301,000                 3,000                 298,000  
Purchase of common stock for treasury (9,235,000)                                   (9,235,000)  
Purchases of 8.48% preferred stock (43,000)         (36,000)       (7,000)                    
Share-based compensation plans:                                        
Share-based compensation 1,743,000                 1,743,000                    
Restricted stock units released                   (574,000)                 574,000  
Restricted stock awards issued, net                   (223,000)                 223,000  
Stock awards 191,000                 45,000                 146,000  
Cash dividends declared:                                        
Preferred stock dividends per share   (4,000) (1,456,000)                   (4,000) (1,456,000)            
Common stock dividends per share (17,080,000)                     (17,080,000)                
Balance at Dec. 31, 2021 505,142,000         17,292,000   161,000   126,105,000   384,007,000         (13,207,000)   (9,216,000)  
Comprehensive income:                                        
Net income 56,573,000                     56,573,000                
Other comprehensive income (loss), net of tax (124,280,000)                               (124,280,000)      
Purchase of common stock for treasury (15,340,000)                                   (15,340,000)  
Share-based compensation plans:                                        
Share-based compensation 2,551,000                 2,551,000                    
Restricted stock units released                   (1,628,000)                 1,628,000  
Restricted stock awards issued, net                   (360,000)                 360,000  
Stock awards 199,000                 (32,000)                 231,000  
Cash dividends declared:                                        
Preferred stock dividends per share   $ (4,000) $ (1,455,000)                   $ (4,000) $ (1,455,000)            
Common stock dividends per share (17,781,000)                     (17,781,000)                
Balance at Dec. 31, 2022 $ 405,605,000         $ 17,292,000   $ 161,000   $ 126,636,000   $ 421,340,000         $ (137,487,000)   $ (22,337,000)