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Loans and Allowance for Loan Losses (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal $ 8,755 $ 8,589 $ 12,504
Impaired loan balance 6,728 6,837 10,703
Impaired loans without an allowance 5,368 6,467 8,819
Impaired loans with an allowance 1,360 370 1,884
Related allowance recorded 274 88 349
Year-to-date average loan balance 7,374 7,408 12,520
Year-to-date interest income recognized 601 288 288
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal 780 752 1,589
Impaired loan balance 780 752 1,589
Impaired loans without an allowance 780 408 167
Impaired loans with an allowance 0 344 1,422
Related allowance recorded 0 78 287
Year-to-date average loan balance 798 1,041 1,611
Year-to-date interest income recognized 7 0 0
Construction Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal 3,672 3,955 6,540
Impaired loan balance 1,937 2,220 4,805
Impaired loans without an allowance 1,937 2,220 4,805
Impaired loans with an allowance 0 0 0
Related allowance recorded 0 0 0
Year-to-date average loan balance 2,068 2,389 6,366
Year-to-date interest income recognized 72 88 235
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal 2,445 2,429 2,880
Impaired loan balance 2,445 2,429 2,880
Impaired loans without an allowance 2,145 2,429 2,833
Impaired loans with an allowance 300 0 47
Related allowance recorded 81 0 17
Year-to-date average loan balance 2,587 2,484 3,009
Year-to-date interest income recognized 505 175 24
Commercial Loan [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal 355 637 371
Impaired loan balance 355 620 371
Impaired loans without an allowance 46 620 137
Impaired loans with an allowance 309 0 234
Related allowance recorded 87 0 28
Year-to-date average loan balance 425 634 393
Year-to-date interest income recognized 2 3 10
Agriculture Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal 1,173 189 285
Impaired loan balance 881 189 285
Impaired loans without an allowance 147 189 146
Impaired loans with an allowance 734 0 139
Related allowance recorded 89 0 5
Year-to-date average loan balance 1,000 188 294
Year-to-date interest income recognized 2 3 0
Municipal Bonds [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal 258 591 772
Impaired loan balance 258 591 706
Impaired loans without an allowance 258 591 706
Impaired loans with an allowance 0 0 0
Related allowance recorded 0 0 0
Year-to-date average loan balance 418 631 772
Year-to-date interest income recognized 0 19 19
Consumer Loan [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid contractual principal 72 36 67
Impaired loan balance 72 36 67
Impaired loans without an allowance 55 10 25
Impaired loans with an allowance 17 26 42
Related allowance recorded 17 10 12
Year-to-date average loan balance 78 41 75
Year-to-date interest income recognized $ 13 $ 0 $ 0