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Loans - Schedule of Ending Balances of Loans and the Related Allowance by Segment and Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI $ 20,986 $ 20,951 $ 21,292 $ 21,977 $ 22,112 $ 22,374
Allowance for loan losses, Loans individually evaluated for impairment 500   686      
Allowance for loan losses, Loans collectively evaluated 20,150   20,245      
Allowance for loan losses, Total 20,986   21,292      
Total loans receivable, PCI 1,927,200   1,796,495      
Total loans receivable, Loans individually evaluated for impairment 22,725   24,345      
Total loans receivable, Loans collectively evaluated 1,904,475   1,772,150      
Total loans 1,955,629   1,832,459      
Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 336 356 361 355   401
Total loans receivable, PCI 28,429   35,964      
Retail Consumer Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 9,813 10,446 11,549 12,070 12,426 12,575
Total loans 1,115,856   1,082,586      
Retail Consumer Loans | One-to-four family            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 343   187      
Allowance for loan losses, Loans collectively evaluated 5,097   6,385      
Allowance for loan losses, Total 5,456   6,595      
Total loans receivable, PCI 602,934   616,663      
Total loans receivable, Loans individually evaluated for impairment 10,980   12,411      
Total loans receivable, Loans collectively evaluated 591,954   604,252      
Total loans 608,118   623,701      
Retail Consumer Loans | One-to-four family | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 16   23      
Total loans receivable, PCI 5,184   7,038      
Retail Consumer Loans | HELOCs - originated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 9   288      
Allowance for loan losses, Loans collectively evaluated 1,714   1,709      
Allowance for loan losses, Total 1,723   1,997      
Total loans receivable, PCI 156,332   163,015      
Total loans receivable, Loans individually evaluated for impairment 14   1,145      
Total loans receivable, Loans collectively evaluated 156,318   161,870      
Total loans 156,615   163,293      
Retail Consumer Loans | HELOCs - originated | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 0   0      
Total loans receivable, PCI 283   278      
Retail Consumer Loans | HELOCs - purchased            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 0   0      
Allowance for loan losses, Loans collectively evaluated 694   558      
Allowance for loan losses, Total 694   558      
Total loans receivable, PCI 173,511   144,377      
Total loans receivable, Loans individually evaluated for impairment 0   0      
Total loans receivable, Loans collectively evaluated 173,511   144,377      
Total loans 173,511   144,377      
Retail Consumer Loans | HELOCs - purchased | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 0   0      
Total loans receivable, PCI 0   0      
Retail Consumer Loans | Construction and land/lots            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 0   198      
Allowance for loan losses, Loans collectively evaluated 959   1,146      
Allowance for loan losses, Total 959   1,344      
Total loans receivable, PCI 42,092   37,528      
Total loans receivable, Loans individually evaluated for impairment 659   392      
Total loans receivable, Loans collectively evaluated 41,433   37,136      
Total loans 42,628   38,102      
Retail Consumer Loans | Construction and land/lots | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 0   0      
Total loans receivable, PCI 536   574      
Retail Consumer Loans | Indirect auto finance            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 0   0      
Allowance for loan losses, Loans collectively evaluated 942   1,016      
Allowance for loan losses, Total 942   1,016      
Total loans receivable, PCI 129,132   108,478      
Total loans receivable, Loans individually evaluated for impairment 31   0      
Total loans receivable, Loans collectively evaluated 129,101   108,478      
Total loans 129,132   108,478      
Retail Consumer Loans | Indirect auto finance | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 0   0      
Total loans receivable, PCI 0   0      
Retail Consumer Loans | Consumer            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 10   10      
Allowance for loan losses, Loans collectively evaluated 45   51      
Allowance for loan losses, Total 55   61      
Total loans receivable, PCI 5,846   4,626      
Total loans receivable, Loans individually evaluated for impairment 10   0      
Total loans receivable, Loans collectively evaluated 5,836   4,626      
Total loans 5,852   4,635      
Retail Consumer Loans | Consumer | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 0   0      
Total loans receivable, PCI 6   9      
Commercial Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 10,837 $ 10,149 9,382 $ 9,552 $ 9,358 $ 9,398
Total loans 839,773   749,873      
Commercial Loans | Commercial real estate            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 135   0      
Allowance for loan losses, Loans collectively evaluated 6,471   6,142      
Allowance for loan losses, Total 6,896   6,430      
Total loans receivable, PCI 514,800   465,238      
Total loans receivable, Loans individually evaluated for impairment 5,928   5,376      
Total loans receivable, Loans collectively evaluated 508,872   459,862      
Total loans 531,321   486,561      
Commercial Loans | Commercial real estate | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 290   288      
Total loans receivable, PCI 16,521   21,323      
Commercial Loans | Construction and development            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 0   0      
Allowance for loan losses, Loans collectively evaluated 2,629   1,891      
Allowance for loan losses, Total 2,641   1,908      
Total loans receivable, PCI 126,589   83,693      
Total loans receivable, Loans individually evaluated for impairment 2,083   1,789      
Total loans receivable, Loans collectively evaluated 124,506   81,904      
Total loans 129,370   86,840      
Commercial Loans | Construction and development | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 12   17      
Total loans receivable, PCI 2,781   3,147      
Commercial Loans | Commercial and industrial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 3   3      
Allowance for loan losses, Loans collectively evaluated 949   685      
Allowance for loan losses, Total 970   721      
Total loans receivable, PCI 74,234   69,694      
Total loans receivable, Loans individually evaluated for impairment 2,726   2,927      
Total loans receivable, Loans collectively evaluated 71,508   66,767      
Total loans 77,352   73,289      
Commercial Loans | Commercial and industrial | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 18   33      
Total loans receivable, PCI 3,118   3,595      
Commercial Loans | Municipal leases            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Loans individually evaluated for impairment 0   0      
Allowance for loan losses, Loans collectively evaluated 650   662      
Allowance for loan losses, Total 650   662      
Total loans receivable, PCI 101,730   103,183      
Total loans receivable, Loans individually evaluated for impairment 294   305      
Total loans receivable, Loans collectively evaluated 101,436   102,878      
Total loans 101,730   103,183      
Commercial Loans | Municipal leases | Purchased Credit Impaired (PCI) Loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, PCI 0   0      
Total loans receivable, PCI $ 0   $ 0