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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, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 16,692 $ 21,079
Recorded Investment, Without Valuation Allowance 13,155 13,934
Recorded Investment, With Valuation Allowance 1,954 6,122
Associated Allowance 439 800
Average Recorded Investment 18,423 16,574
Interest Income Recognized 546 992
Total Mortgage Loans on Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 15,675 19,921
Recorded Investment, Without Valuation Allowance 12,992 13,853
Recorded Investment, With Valuation Allowance 1,346 5,133
Associated Allowance 256 529
Average Recorded Investment 16,856 15,679
Interest Income Recognized 525 917
Residential 1-4 Family [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,449 2,496
Recorded Investment, Without Valuation Allowance 1,980 1,835
Recorded Investment, With Valuation Allowance 390 622
Associated Allowance 75 75
Average Recorded Investment 2,429 2,741
Interest Income Recognized 74 119
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 12,430 16,193
Recorded Investment, Without Valuation Allowance 10,758 11,095
Recorded Investment, With Valuation Allowance 436 4,274
Associated Allowance 87 415
Average Recorded Investment 13,447 11,885
Interest Income Recognized 435 727
Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 93 619
Recorded Investment, Without Valuation Allowance 0 528
Recorded Investment, With Valuation Allowance 93 96
Associated Allowance 18 22
Average Recorded Investment 269 496
Interest Income Recognized 4 43
Second Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 359 526
Recorded Investment, Without Valuation Allowance 201 309
Recorded Investment, With Valuation Allowance 137 141
Associated Allowance 15 17
Average Recorded Investment 461 511
Interest Income Recognized 12 25
Equity Line of Credit [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 344 87
Recorded Investment, Without Valuation Allowance 53 86
Recorded Investment, With Valuation Allowance 290 0
Associated Allowance 61 0
Average Recorded Investment 250 46
Interest Income Recognized 0 3
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,017 1,077
Recorded Investment, Without Valuation Allowance 163 0
Recorded Investment, With Valuation Allowance 608 989
Associated Allowance 183 271
Average Recorded Investment 1,513 827
Interest Income Recognized 21 74
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 81
Recorded Investment, Without Valuation Allowance 0 81
Recorded Investment, With Valuation Allowance 0 0
Associated Allowance 0 0
Average Recorded Investment 54 68
Interest Income Recognized $ 0 $ 1