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Loans and the Allowance for Loan Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 19,828 $ 14,173
Without Valuation Allowance 13,187 8,414
With Valuation Allowance 5,540 4,636
Associated Allowance 633 798
Average Recorded Investment 15,321 13,573
Interest Income Recognized 637 660
Total Mortgage Loans on Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 18,589 13,831
Without Valuation Allowance 12,910 8,195
With Valuation Allowance 4,666 4,568
Associated Allowance 418 790
Average Recorded Investment 14,485 12,608
Interest Income Recognized 574 631
Residential 1-4 Family [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,351 2,994
Without Valuation Allowance 2,474 1,530
With Valuation Allowance 762 1,261
Associated Allowance 75 146
Average Recorded Investment 2,833 2,267
Interest Income Recognized 101 132
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 13,992 10,203
Without Valuation Allowance 9,409 6,166
With Valuation Allowance 3,756 3,208
Associated Allowance 304 608
Average Recorded Investment 10,645 9,305
Interest Income Recognized 418 473
Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 623 99
Without Valuation Allowance 533 0
With Valuation Allowance 96 99
Associated Allowance 34 36
Average Recorded Investment 454 465
Interest Income Recognized 32 5
Second Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 530 535
Without Valuation Allowance 401 499
With Valuation Allowance 52 0
Associated Allowance 5 0
Average Recorded Investment 522 571
Interest Income Recognized 21 21
Equity Line of Credit [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 93  
Without Valuation Allowance 93  
With Valuation Allowance 0  
Associated Allowance 0  
Average Recorded Investment 31  
Interest Income Recognized 2  
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,061 330
Without Valuation Allowance 196 207
With Valuation Allowance 777 68
Associated Allowance 180 8
Average Recorded Investment 772 952
Interest Income Recognized 57 28
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 178 12
Without Valuation Allowance 81 12
With Valuation Allowance 97 0
Associated Allowance 35 0
Average Recorded Investment 64 13
Interest Income Recognized $ 6 $ 1