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Loans and the Allowance for Loan Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 22,658 $ 21,079
Recorded Investment, Without Valuation Allowance 15,121 13,934
Recorded Investment, With Valuation Allowance 6,491 6,122
Associated Allowance 1,128 800
Average Recorded Investment 21,894 16,574
Interest Income Recognized 278 992
Total Mortgage Loans on Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 20,590 19,921
Recorded Investment, Without Valuation Allowance 14,533 13,853
Recorded Investment, With Valuation Allowance 5,099 5,133
Associated Allowance 769 529
Average Recorded Investment 19,885 15,679
Interest Income Recognized 247 917
Residential 1-4 Family [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,451 2,496
Recorded Investment, Without Valuation Allowance 1,937 1,835
Recorded Investment, With Valuation Allowance 459 622
Associated Allowance 59 75
Average Recorded Investment 2,407 2,741
Interest Income Recognized 27 119
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 16,892 16,193
Recorded Investment, Without Valuation Allowance 11,728 11,095
Recorded Investment, With Valuation Allowance 4,288 4,274
Associated Allowance 674 415
Average Recorded Investment 16,232 11,885
Interest Income Recognized 201 727
Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 619 619
Recorded Investment, Without Valuation Allowance 527 528
Recorded Investment, With Valuation Allowance 95 96
Associated Allowance 20 22
Average Recorded Investment 620 496
Interest Income Recognized 13 43
Second Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 541 526
Recorded Investment, Without Valuation Allowance 255 309
Recorded Investment, With Valuation Allowance 257 141
Associated Allowance 16 17
Average Recorded Investment 539 511
Interest Income Recognized 6 25
Equity Line of Credit [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 87 87
Recorded Investment, Without Valuation Allowance 86 86
Recorded Investment, With Valuation Allowance 0 0
Associated Allowance 0 0
Average Recorded Investment 87 46
Interest Income Recognized 0 3
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,987 1,077
Recorded Investment, Without Valuation Allowance 507 0
Recorded Investment, With Valuation Allowance 1,392 989
Associated Allowance 359 271
Average Recorded Investment 1,928 827
Interest Income Recognized 31 74
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 81 81
Recorded Investment, Without Valuation Allowance 81 81
Recorded Investment, With Valuation Allowance 0 0
Associated Allowance 0 0
Average Recorded Investment 81 68
Interest Income Recognized $ 0 $ 1