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, 2015	Dec. 31, 2014	Dec. 31, 2013
Recorded Investment
Total	$ 32,727	$ 43,577
Unpaid Principal Balance
Total	39,350	51,269
Related Valuation Allowance
Total	2,517	3,541
Average Recorded Investment
Total	38,514	49,602	$ 66,600
Interest Income Recognized
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	880	1,345
Construction Land Development [Member]
Recorded Investment
Impaired Loans with No Related Allowance Recorded	107	1,824
Impaired Loans with an Allowance Recorded	835	886
Total	942	2,710
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	255	2,239
Impaired Loans with an Allowance Recorded	870	931
Total	1,125	3,170
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	84	159
Total	84	159
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	1,252	2,080
Impaired Loans with an Allowance Recorded	987	1,213
Total	2,239	3,293
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6	106
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	29	81
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	35	187
Commercial Real Estate [Member]
Recorded Investment
Impaired Loans with No Related Allowance Recorded	2,363	3,087
Impaired Loans with an Allowance Recorded	7,087	8,359
Total	9,450	11,446
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	3,911	4,600
Impaired Loans with an Allowance Recorded	7,087	8,469
Total	10,998	13,069
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	429	529
Total	429	529
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	2,880	2,713
Impaired Loans with an Allowance Recorded	7,280	10,446
Total	10,160	13,159
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	16	20
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	302	461
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	318	481
Residential Real Estate [Member]
Recorded Investment
Impaired Loans with No Related Allowance Recorded	9,256	11,898
Impaired Loans with an Allowance Recorded	12,447	16,804
Total	21,703	28,702
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	13,707	16,562
Impaired Loans with an Allowance Recorded	12,803	17,693
Total	26,510	34,255
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	1,964	2,741
Total	1,964	2,741
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	10,259	11,366
Impaired Loans with an Allowance Recorded	15,136	20,793
Total	25,395	32,159
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	168	198
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	337	445
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	505	643
Commercial And Financial [Member]
Recorded Investment
Impaired Loans with No Related Allowance Recorded	17	120
Impaired Loans with an Allowance Recorded	0	0
Total	17	120
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	17	120
Impaired Loans with an Allowance Recorded	0	0
Total	17	120
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	84	110
Impaired Loans with an Allowance Recorded	0	47
Total	84	157
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	8
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	1	8
Consumer [Member]
Recorded Investment
Impaired Loans with No Related Allowance Recorded	264	65
Impaired Loans with an Allowance Recorded	351	534
Total	615	599
Unpaid Principal Balance
Impaired Loans with No Related Allowance Recorded	349	93
Impaired Loans with an Allowance Recorded	351	562
Total	700	655
Related Valuation Allowance
Impaired Loans with No Related Allowance Recorded	0	0
Impaired Loans with an Allowance Recorded	40	112
Total	40	112
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	141	291
Impaired Loans with an Allowance Recorded	495	543
Total	636	834
Interest Income Recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	3	1
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	18	25
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total	$ 21	$ 26

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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