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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]
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 (2,409)     (2,409)    
Issuance of common shares due to issuance of stock options, restricted stock and ESOP 6,771 4 6,767      
Issuance of common shares due to exercise of stock options 37,296 5 37,291      
Contingent consideration equity earnout due to SCS acquisition 24,142   24,142      
Stock compensation 493   493      
Net change in unrealized losses on securities, net of income taxes (22,906)       (22,906)  
Net income 33,386 [1]     33,386    
Balance at Mar. 31, 2017 411,748 94 253,473 158,167 14 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 (2,517)     (2,517)    
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 (2,126)   (726)     (1,400)
Stock compensation 6,322   6,322      
Net change in unrealized losses on securities, net of income taxes (30,332)       (30,332)  
Net income 36,106     36,106    
Balance at Mar. 31, 2018 $ 443,703 $ 97 $ 265,685 $ 200,753 $ (21,166) $ (1,666)
[1] See Note 1. Basis of Presentation for further discussion on the current presentation.