Loans and Allowance for Loan and Lease Losses - Credit Quality (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Non-PCI loans by the internal risk grading system
Total Gross loans	$ 1,247,280	$ 1,193,483
Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	1,190,282	1,130,984
Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	12,048	9,874
Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	44,950	52,395
Credit Risk Grades, Doubtful
Non-PCI loans by the internal risk grading system
Total Gross loans		230
Real Estate Secured
Non-PCI loans by the internal risk grading system
Total Gross loans	1,012,076	975,603
Real Estate Secured | Commercial real estate
Non-PCI loans by the internal risk grading system
Total Gross loans	579,244	588,472
Real Estate Secured | Residential 1 to 4 family
Non-PCI loans by the internal risk grading system
Total Gross loans	165,829	127,201
Real Estate Secured | Farmland
Non-PCI loans by the internal risk grading system
Total Gross loans	120,566	98,373
Real Estate Secured | Multi-family residential
Non-PCI loans by the internal risk grading system
Total Gross loans	79,381	78,645
Real Estate Secured | Construction and land
Non-PCI loans by the internal risk grading system
Total Gross loans	35,669	44,660
Real Estate Secured | Home equity lines of credit
Non-PCI loans by the internal risk grading system
Total Gross loans	31,387	38,252
Commercial
Non-PCI loans by the internal risk grading system
Total Gross loans	229,171	209,902
Commercial | Commercial and industrial
Non-PCI loans by the internal risk grading system
Total Gross loans	164,808	154,787
Commercial | Agriculture
Non-PCI loans by the internal risk grading system
Total Gross loans	64,363	55,101
Commercial | Other
Non-PCI loans by the internal risk grading system
Total Gross loans		14
Consumer
Non-PCI loans by the internal risk grading system
Total Gross loans	6,033	7,978
Non-PCI Loans
Non-PCI loans by the internal risk grading system
Total Gross loans	1,238,505	1,183,183
Non-PCI Loans | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	1,189,524	1,130,528
Non-PCI Loans | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	10,819	9,097
Non-PCI Loans | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	38,162	43,404
Non-PCI Loans | Credit Risk Grades, Doubtful
Non-PCI loans by the internal risk grading system
Total Gross loans		154
Non-PCI Loans | Real Estate Secured
Non-PCI loans by the internal risk grading system
Total Gross loans	1,005,536	968,110
Non-PCI Loans | Real Estate Secured | Commercial real estate
Non-PCI loans by the internal risk grading system
Total Gross loans	573,559	584,056
Non-PCI Loans | Real Estate Secured | Commercial real estate | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	545,614	560,478
Non-PCI Loans | Real Estate Secured | Commercial real estate | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	4,402	3,010
Non-PCI Loans | Real Estate Secured | Commercial real estate | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	23,543	20,568
Non-PCI Loans | Real Estate Secured | Residential 1 to 4 family
Non-PCI loans by the internal risk grading system
Total Gross loans	165,256	126,640
Non-PCI Loans | Real Estate Secured | Residential 1 to 4 family | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	164,226	125,733
Non-PCI Loans | Real Estate Secured | Residential 1 to 4 family | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	405	199
Non-PCI Loans | Real Estate Secured | Residential 1 to 4 family | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	625	708
Non-PCI Loans | Real Estate Secured | Farmland
Non-PCI loans by the internal risk grading system
Total Gross loans	120,566	96,708
Non-PCI Loans | Real Estate Secured | Farmland | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	118,740	92,481
Non-PCI Loans | Real Estate Secured | Farmland | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	245	2,665
Non-PCI Loans | Real Estate Secured | Farmland | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	1,581	1,562
Non-PCI Loans | Real Estate Secured | Multi-family residential
Non-PCI loans by the internal risk grading system
Total Gross loans	79,381	78,645
Non-PCI Loans | Real Estate Secured | Multi-family residential | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	79,381	78,023
Non-PCI Loans | Real Estate Secured | Multi-family residential | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans		622
Non-PCI Loans | Real Estate Secured | Construction and land
Non-PCI loans by the internal risk grading system
Total Gross loans	35,387	43,809
Non-PCI Loans | Real Estate Secured | Construction and land | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	30,219	37,422
Non-PCI Loans | Real Estate Secured | Construction and land | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	939
Non-PCI Loans | Real Estate Secured | Construction and land | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	4,229	6,387
Non-PCI Loans | Real Estate Secured | Home equity lines of credit
Non-PCI loans by the internal risk grading system
Total Gross loans	31,387	38,252
Non-PCI Loans | Real Estate Secured | Home equity lines of credit | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	31,103	37,638
Non-PCI Loans | Real Estate Secured | Home equity lines of credit | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	284	614
Non-PCI Loans | Commercial
Non-PCI loans by the internal risk grading system
Total Gross loans	226,936	207,095
Non-PCI Loans | Commercial | Commercial and industrial
Non-PCI loans by the internal risk grading system
Total Gross loans	164,025	153,403
Non-PCI Loans | Commercial | Commercial and industrial | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	152,979	138,202
Non-PCI Loans | Commercial | Commercial and industrial | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	4,730	2,943
Non-PCI Loans | Commercial | Commercial and industrial | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	6,316	12,104
Non-PCI Loans | Commercial | Commercial and industrial | Credit Risk Grades, Doubtful
Non-PCI loans by the internal risk grading system
Total Gross loans		154
Non-PCI Loans | Commercial | Agriculture
Non-PCI loans by the internal risk grading system
Total Gross loans	62,911	53,678
Non-PCI Loans | Commercial | Agriculture | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	61,340	52,678
Non-PCI Loans | Commercial | Agriculture | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	98	280
Non-PCI Loans | Commercial | Agriculture | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	1,473	720
Non-PCI Loans | Commercial | Other
Non-PCI loans by the internal risk grading system
Total Gross loans		14
Non-PCI Loans | Commercial | Other | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans		14
Non-PCI Loans | Consumer
Non-PCI loans by the internal risk grading system
Total Gross loans	6,033	7,978
Non-PCI Loans | Consumer | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	5,922	7,873
Non-PCI Loans | Consumer | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	111	105
PCI loans
Non-PCI loans by the internal risk grading system
Total Gross loans	8,775	10,300
PCI loans | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	758	456
PCI loans | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	1,229	777
PCI loans | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	6,788	8,991
PCI loans | Credit Risk Grades, Doubtful
Non-PCI loans by the internal risk grading system
Total Gross loans		76
PCI loans | Real Estate Secured
Non-PCI loans by the internal risk grading system
Total Gross loans	6,540	7,493
PCI loans | Real Estate Secured | Commercial real estate
Non-PCI loans by the internal risk grading system
Total Gross loans	5,685	4,416
PCI loans | Real Estate Secured | Commercial real estate | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans		126
PCI loans | Real Estate Secured | Commercial real estate | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	1,094	680
PCI loans | Real Estate Secured | Commercial real estate | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	4,591	3,610
PCI loans | Real Estate Secured | Residential 1 to 4 family
Non-PCI loans by the internal risk grading system
Total Gross loans	573	561
PCI loans | Real Estate Secured | Residential 1 to 4 family | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	455
PCI loans | Real Estate Secured | Residential 1 to 4 family | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	118	561
PCI loans | Real Estate Secured | Farmland
Non-PCI loans by the internal risk grading system
Total Gross loans		1,665
PCI loans | Real Estate Secured | Farmland | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans		1,665
PCI loans | Real Estate Secured | Construction and land
Non-PCI loans by the internal risk grading system
Total Gross loans	282	851
PCI loans | Real Estate Secured | Construction and land | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	228	294
PCI loans | Real Estate Secured | Construction and land | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	54
PCI loans | Real Estate Secured | Construction and land | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans		557
PCI loans | Commercial
Non-PCI loans by the internal risk grading system
Total Gross loans	2,235	2,807
PCI loans | Commercial | Commercial and industrial
Non-PCI loans by the internal risk grading system
Total Gross loans	783	1,384
PCI loans | Commercial | Commercial and industrial | Credit Risk Grades, Pass
Non-PCI loans by the internal risk grading system
Total Gross loans	75	36
PCI loans | Commercial | Commercial and industrial | Credit Risk Grades, Special Mention
Non-PCI loans by the internal risk grading system
Total Gross loans	81	97
PCI loans | Commercial | Commercial and industrial | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	627	1,175
PCI loans | Commercial | Commercial and industrial | Credit Risk Grades, Doubtful
Non-PCI loans by the internal risk grading system
Total Gross loans		76
PCI loans | Commercial | Agriculture
Non-PCI loans by the internal risk grading system
Total Gross loans	1,452	1,423
PCI loans | Commercial | Agriculture | Credit Risk Grades, Substandard
Non-PCI loans by the internal risk grading system
Total Gross loans	$ 1,452	$ 1,423