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Loans and Allowance for Loan Losses (Details 2) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal $ 8,027 $ 8,589
Impaired loan balance 6,077 6,837
Impaired loans without an allowance 5,525 6,467
Impaired loans with an allowance 552 370
Related allowance recorded 37 88
Year-to-date average loan balance 6,438 7,408
Year-to-date interest income recognized 461 288
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal 309 752
Impaired loan balance 309 752
Impaired loans without an allowance 309 408
Impaired loans with an allowance 0 344
Related allowance recorded 0 78
Year-to-date average loan balance 323 1,041
Year-to-date interest income recognized 6 0
Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal 3,741 3,955
Impaired loan balance 2,006 2,220
Impaired loans without an allowance 2,006 2,220
Impaired loans with an allowance 0 0
Related allowance recorded 0 0
Year-to-date average loan balance 2,101 2,389
Year-to-date interest income recognized 56 88
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal 2,517 2,429
Impaired loan balance 2,517 2,429
Impaired loans without an allowance 2,517 2,429
Impaired loans with an allowance 0 0
Related allowance recorded 0 0
Year-to-date average loan balance 2,618 2,484
Year-to-date interest income recognized 383 175
Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal 114 637
Impaired loan balance 114 620
Impaired loans without an allowance 62 620
Impaired loans with an allowance 52 0
Related allowance recorded 13 0
Year-to-date average loan balance 138 634
Year-to-date interest income recognized 2 3
Agriculture Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal 891 189
Impaired loan balance 676 189
Impaired loans without an allowance 224 189
Impaired loans with an allowance 452 0
Related allowance recorded 2 0
Year-to-date average loan balance 686 188
Year-to-date interest income recognized 4 3
Municipal Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal 345 591
Impaired loan balance 345 591
Impaired loans without an allowance 345 591
Impaired loans with an allowance 0 0
Related allowance recorded 0 0
Year-to-date average loan balance 456 631
Year-to-date interest income recognized 10 19
Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid contractual principal 110 36
Impaired loan balance 110 36
Impaired loans without an allowance 62 10
Impaired loans with an allowance 48 26
Related allowance recorded 22 10
Year-to-date average loan balance 116 41
Year-to-date interest income recognized $ 0 $ 0