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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of Accounting Standards Update 2016-09     $ 104 $ (104)    
Balance at Sep. 30, 2016 $ 334,975 $ 85 184,780 127,190 $ 22,920 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cash dividends declared on common stock (3,625)     (3,625)    
Issuance of common shares due to ESOP 1,174   1,174      
Issuance of common shares due to acquisition 37,296 5 37,291      
Issuance of common shares due to exercise of stock options 529   529      
Contingent consideration equity earnout due to acquisition 24,142   24,142      
Issuance of common shares due to restricted stock 4 4        
Shares repurchased for tax withholdings on stock compensation (337)   (337)      
Stock compensation 8,405   8,405      
Net change in unrealized losses on securities, net of income taxes (15,523)       (15,523)  
Net income 43,173     43,173    
Balance at Jun. 30, 2017 430,213 94 256,088 166,634 7,397 0
Balance at Sep. 30, 2017 434,496 96 258,336 167,164 9,166 (266)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cash dividends declared on common stock (3,778)     (3,778)    
Issuance of common shares due to exercise of stock options 147   147      
Issuance of common shares due to restricted stock 1 1        
Issuance of common shares due to ESOP 1,606   1,606      
Shares repurchased for tax withholdings on stock compensation (2,131)   (726)     (1,405)
Stock compensation 8,441   8,441      
Net change in unrealized losses on securities, net of income taxes (37,767)       (37,767)  
Net income 42,898     42,898    
Balance at Jun. 30, 2018 $ 443,913 $ 97 $ 267,804 $ 206,284 $ (28,601) $ (1,671)