Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Allowance for loan losses
Loans	$ 972,668	$ 901,461
Loans, excluding consumer finance	668,511	609,706
Pass
Allowance for loan losses
Loans, excluding consumer finance	626,586	563,666
Pass | CVBK
Allowance for loan losses
Loans	58,120
Loans, excluding consumer finance		71,140
Special Mention
Allowance for loan losses
Loans, excluding consumer finance	9,097	11,161
Special Mention | CVBK
Allowance for loan losses
Loans	4,670
Loans, excluding consumer finance		4,090
Substandard
Allowance for loan losses
Loans, excluding consumer finance	28,515	28,722
Substandard | CVBK
Allowance for loan losses
Loans	4,100
Loans, excluding consumer finance		5,150
Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	4,313	6,157
Substandard Nonaccrual | CVBK
Allowance for loan losses
Loans	187
Loans, excluding consumer finance		542
Real estate - residential mortgage
Allowance for loan losses
Loans	185,451	186,763
Loans, excluding consumer finance	185,451	186,763
Real estate - residential mortgage | Pass
Allowance for loan losses
Loans, excluding consumer finance	179,373	181,107
Real estate - residential mortgage | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	1,499	1,276
Real estate - residential mortgage | Substandard
Allowance for loan losses
Loans, excluding consumer finance	2,832	2,083
Real estate - residential mortgage | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	1,747	2,297
Real estate - construction
Allowance for loan losses
Loans	33,283	7,759
Real estate - construction | Construction Lending
Allowance for loan losses
Loans, excluding consumer finance	25,873	5,996
Real estate - construction | Construction Lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	25,873	5,924
Real estate - construction | Construction Lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance		72
Real estate - construction | Consumer lot lending
Allowance for loan losses
Loans, excluding consumer finance	7,410	1,763
Real estate - construction | Consumer lot lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	7,410	1,763
Commercial, financial and agricultural
Allowance for loan losses
Loans	390,863	356,062
Commercial, financial and agricultural | Commercial real estate lending
Allowance for loan losses
Loans, excluding consumer finance	239,291	217,616
Commercial, financial and agricultural | Commercial real estate lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	220,137	195,479
Commercial, financial and agricultural | Commercial real estate lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	5,643	6,089
Commercial, financial and agricultural | Commercial real estate lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance	11,855	13,533
Commercial, financial and agricultural | Commercial real estate lending | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	1,656	2,515
Commercial, financial and agricultural | Land acquisition and development lending
Allowance for loan losses
Loans, excluding consumer finance	60,349	46,311
Commercial, financial and agricultural | Land acquisition and development lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	58,416	45,061
Commercial, financial and agricultural | Land acquisition and development lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	710	856
Commercial, financial and agricultural | Land acquisition and development lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance	1,223	394
Commercial, financial and agricultural | Builder line lending
Allowance for loan losses
Loans, excluding consumer finance	22,499	20,971
Commercial, financial and agricultural | Builder line lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	21,569	19,252
Commercial, financial and agricultural | Builder line lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	563	829
Commercial, financial and agricultural | Builder line lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance	367	531
Commercial, financial and agricultural | Builder line lending | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance		359
Commercial, financial and agricultural | Commercial business lending
Allowance for loan losses
Loans, excluding consumer finance	68,724	71,164
Commercial, financial and agricultural | Commercial business lending | Pass
Allowance for loan losses
Loans, excluding consumer finance	57,006	57,928
Commercial, financial and agricultural | Commercial business lending | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	44	1,306
Commercial, financial and agricultural | Commercial business lending | Substandard
Allowance for loan losses
Loans, excluding consumer finance	11,532	11,844
Commercial, financial and agricultural | Commercial business lending | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	142	86
Equity lines
Allowance for loan losses
Loans	50,278	50,111
Loans, excluding consumer finance	50,278	50,111
Equity lines | Pass
Allowance for loan losses
Loans, excluding consumer finance	48,699	48,392
Equity lines | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	632	617
Equity lines | Substandard
Allowance for loan losses
Loans, excluding consumer finance	182	221
Equity lines | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	765	881
Consumer Loan
Allowance for loan losses
Loans	8,636	9,011
Loans, excluding consumer finance	8,636	9,011
Consumer Loan | Pass
Allowance for loan losses
Loans, excluding consumer finance	8,103	8,760
Consumer Loan | Special Mention
Allowance for loan losses
Loans, excluding consumer finance	6	116
Consumer Loan | Substandard
Allowance for loan losses
Loans, excluding consumer finance	524	116
Consumer Loan | Substandard Nonaccrual
Allowance for loan losses
Loans, excluding consumer finance	$ 3	$ 19