Impaired Loans and Allowance for Loan Losses - Company's Recorded Investments in Impaired Loans and the Related Valuation Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Recorded Investment
Total	$ 32,718	$ 32,727
Unpaid Principal Balance
Total	39,157	39,350
Related Valuation Allowance
Total	2,454	2,517
Average Recorded Investment
Total	31,187	38,514	$ 49,600
Interest Income Recognized
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	1,586	880
Construction Land Development [Member]
Recorded Investment
Impaired Loans with no related allowance recorded	226	107
Impaired Loans with an allowance recorded	51	835
Total	277	942
Unpaid Principal Balance
Impaired Loans with no related allowance recorded	321	255
Impaired Loans with an allowance recorded	51	870
Total	372	1,125
Related Valuation Allowance
Impaired Loans with no related allowance recorded	0	0
Impaired Loans with an allowance recorded	0	84
Total	0	84
Average Recorded Investment
Impaired Loans with no related allowance recorded	193	1,252
Impaired Loans with an allowance recorded	605	987
Total	798	2,239
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	17	6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	29
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	19	35
Commercial Real Estate [Member]
Recorded Investment
Impaired Loans with no related allowance recorded	3,267	2,363
Impaired Loans with an allowance recorded	6,937	7,087
Total	10,204	9,450
Unpaid Principal Balance
Impaired Loans with no related allowance recorded	4,813	3,911
Impaired Loans with an allowance recorded	6,949	7,087
Total	11,762	10,998
Related Valuation Allowance
Impaired Loans with no related allowance recorded	0	0
Impaired Loans with an allowance recorded	395	429
Total	395	429
Average Recorded Investment
Impaired Loans with no related allowance recorded	1,784	2,880
Impaired Loans with an allowance recorded	6,699	7,280
Total	8,483	10,160
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	215	16
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	309	302
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	524	318
Residential Real Estate [Member]
Recorded Investment
Impaired Loans with no related allowance recorded	9,706	9,256
Impaired Loans with an allowance recorded	12,332	12,447
Total	22,038	21,703
Unpaid Principal Balance
Impaired Loans with no related allowance recorded	14,136	13,707
Impaired Loans with an allowance recorded	12,681	12,803
Total	26,817	26,510
Related Valuation Allowance
Impaired Loans with no related allowance recorded	0	0
Impaired Loans with an allowance recorded	2,059	1,964
Total	2,059	1,964
Average Recorded Investment
Impaired Loans with no related allowance recorded	9,370	10,259
Impaired Loans with an allowance recorded	12,015	15,136
Total	21,385	25,395
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	579	168
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	455	337
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	1,034	505
Commercial And Financial [Member]
Recorded Investment
Impaired Loans with no related allowance recorded	199	17
Impaired Loans with an allowance recorded	0	0
Total	199	17
Unpaid Principal Balance
Impaired Loans with no related allowance recorded	206	17
Impaired Loans with an allowance recorded	0	0
Total	206	17
Related Valuation Allowance
Impaired Loans with no related allowance recorded	0	0
Impaired Loans with an allowance recorded	0	0
Total	0	0
Average Recorded Investment
Impaired Loans with no related allowance recorded	15	84
Impaired Loans with an allowance recorded	0	0
Total	15	84
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	9	1
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	9	1
Consumer [Member]
Recorded Investment
Impaired Loans with no related allowance recorded	0	264
Impaired Loans with an allowance recorded	0	351
Total	0	615
Unpaid Principal Balance
Impaired Loans with no related allowance recorded	0	349
Impaired Loans with an allowance recorded	0	351
Total	0	700
Related Valuation Allowance
Impaired Loans with no related allowance recorded	0	0
Impaired Loans with an allowance recorded	0	40
Total	0	40
Average Recorded Investment
Impaired Loans with no related allowance recorded	168	141
Impaired Loans with an allowance recorded	338	495
Total	506	636
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	3
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	18
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	$ 0	$ 21

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-Publisher FASB
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