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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Other Commitments      
Unused commitments to extend credit $ 51,791   $ 39,609
Variable rate commitments 28,612 $ 9,932  
Fixed rate commitments 23,179 $ 29,677  
Remaining borrowing capacity 347,718   340,397
Required cash reserve 2,150   2,346
Letters of credit outstanding $ 2,094   2,326
Minimum      
Other Commitments      
Fixed interest rate (as a percent) 2.24% 2.02%  
Loan commitments, term 3 years    
Maximum      
Other Commitments      
Fixed interest rate (as a percent) 5.33% 7.99%  
Loan commitments, term 30 years    
Construction and development      
Other Commitments      
Unused commitments to extend credit $ 123,871   $ 125,157