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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Parent [Member]
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Noncontrolling Interest
Beginning Balance at Sep. 30, 2017 $ 434,496 $ 434,496 $ 288 $ 258,144 $ 167,164 $ 9,166 $ (266) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cash dividends declared on common stock (2,517) (2,517)     (2,517)      
Issuance of common shares due to exercise of stock options 147 147   147        
Issuance of common shares due to restricted stock 2 2 2          
Issuance of common shares due to ESOP 1,606 1,606 1 1,605        
Shares repurchased for tax withholdings on stock compensation (2,126) (2,126)   (726)     (1,400)  
Stock compensation 6,321 6,321   6,321        
Total other comprehensive income (30,332) (30,332)       (30,332)    
Net income 36,106 36,106     36,106      
Ending Balance at Mar. 31, 2018 443,703 443,703 291 265,491 200,753 (21,166) (1,666) 0
Beginning Balance at Dec. 31, 2017 437,705 437,705 290 262,678 170,578 5,782 (1,623) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cash dividends declared on common stock (1,261) (1,261)     (1,261)      
Issuance of common shares due to exercise of stock options 147 147   147        
Issuance of common shares due to restricted stock 1 1 1          
Shares repurchased for tax withholdings on stock compensation (455) (455)   (412)     (43)  
Stock compensation 3,078 3,078   3,078        
Total other comprehensive income (26,948) (26,948)       (26,948)    
Net income 31,436 31,436     31,436      
Ending Balance at Mar. 31, 2018 443,703 443,703 291 265,491 200,753 (21,166) (1,666) 0
Beginning Balance at Sep. 30, 2018 747,726 744,152 393 565,811 213,048 (33,111) (1,989) 3,574
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cash dividends declared on common stock (3,943) (3,943)     (3,943)      
Issuance of common shares due to exercise of stock options 54 54   54        
Issuance of common shares due to restricted stock 3 3 3          
Issuance of common shares due to ESOP 2,010 2,010   2,010        
Shares repurchased for tax withholdings on stock compensation (2,967) (2,967) (1) 1     (2,967) 0
Stock compensation 8,530 8,530   8,530        
Total other comprehensive income 23,322 23,322       23,322    
Net income 49,518 47,518     47,518     2,000
Net investment by (distribution to) noncontrolling interests (2,046)             (2,046)
Ending Balance at Mar. 31, 2019 823,709 820,181 395 576,406 258,600 (10,264) (4,956) 3,528
Beginning Balance at Dec. 31, 2018 770,728 767,461 394 572,156 228,453 (29,186) (4,356) 3,267
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cash dividends declared on common stock (1,973) (1,973)     (1,973)      
Issuance of common shares due to exercise of stock options 1 1 1          
Shares repurchased for tax withholdings on stock compensation (600) (600)   0     (600)  
Stock compensation 4,250 4,250   4,250        
Total other comprehensive income 18,922 18,922       18,922    
Net income 33,198 32,120     32,120     1,078
Net investment by (distribution to) noncontrolling interests (817)             (817)
Ending Balance at Mar. 31, 2019 $ 823,709 $ 820,181 $ 395 $ 576,406 $ 258,600 $ (10,264) $ (4,956) $ 3,528