Accounting for Certain Loans Acquired in a Transfer - Summary of contractually required payments receivable at acquisition (Details 2) (Dupont State Bank, Loans Receivable, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Contractually required payments receivable at acquisition
Total required payments receivable	$ 5,285
Cash flows expected to be collected at acquisition	3,838
Basis in acquired loans at acquisition	3,088
Construction / Land
Contractually required payments receivable at acquisition
Total required payments receivable	750
One-to-four family residential
Contractually required payments receivable at acquisition
Total required payments receivable	2,193
Multi-family residential
Contractually required payments receivable at acquisition
Total required payments receivable	687
Nonresidential and agricultural land
Contractually required payments receivable at acquisition
Total required payments receivable	1,530
Commercial
Contractually required payments receivable at acquisition
Total required payments receivable	73
Consumer
Contractually required payments receivable at acquisition
Total required payments receivable	$ 52