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Stockholders' Equity (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 07, 2017
Jul. 17, 2017
Jun. 14, 2017
Jun. 06, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
May 05, 2017
May 04, 2017
Class of Stock [Line Items]                      
Number of shares tendered and not properly withdrawn (in shares)       2,858,425              
Tendered shares as percent of shares outstanding                     6.20%
Dividends declared (in dollars per share)     $ 0.25   $ 0.25 $ 0 $ 0.25 $ 0      
Dividends payable         $ 5,268,000   $ 5,268,000   $ 0    
Net operating losses and tax credits                 $ 113,000,000    
Subsequent Event                      
Class of Stock [Line Items]                      
Dividends declared (in dollars per share) $ 0.25                    
Dividends paid   $ 5,200,000                  
Common Stock                      
Class of Stock [Line Items]                      
Shares acquired (in shares)       1,370,891              
Cost per share (in dollars per shares)       $ 9.40              
Treasury stock acquired       $ 12,900,000              
Additional tendered shares acquires (in shares)       445,891              
Common Stock | Manager of a Financial Institution                      
Class of Stock [Line Items]                      
Shares acquired (in shares)       70,178              
Maximum                      
Class of Stock [Line Items]                      
Number of shares authorized to be repurchased (in shares)                   925,000  
Share price (in dollars per shares)                   $ 10.8  
Authorized amount                   $ 9,990,000  
Additional authorized amount (percent)                   2.00%  
Requirement to own shares outstanding as percent       4.99%              
Maximum | Manager of a Financial Institution                      
Class of Stock [Line Items]                      
Requirement to own shares outstanding as percent       4.99%              
Minimum                      
Class of Stock [Line Items]                      
Share price (in dollars per shares)                   $ 9.4