Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Readily Available Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents	$ 30,136	[1]	$ 43,702	[2]
Investment securities	0	[1]	0	[2]
Loans held for sale			0	[2]
Loans
Agricultural	0	[1]	0	[2]
Commercial and financial	0	[1]	0	[2]
Real estate:
Construction, 1 to 4 family residential	0	[1]	0	[2]
Construction, land development and commercial	0	[1]	0	[2]
Mortgage, farmland	0	[1]	0	[2]
Mortgage, 1 to 4 family first liens	0	[1]	0	[2]
Mortgage, 1 to 4 family junior liens	0	[1]	0	[2]
Mortgage, multi-family	0	[1]	0	[2]
Mortgage, commercial	0	[1]	0	[2]
Loans to individuals	0	[1]	0	[2]
Obligations of state and political subdivisions	0	[1]	0	[2]
Accrued interest receivable	0	[2]	0	[2]
Total financial instrument assets	30,136	[1]	43,702	[2]
Deposits
Noninterest-bearing deposits	0	[1]	0	[2]
Interest-bearing deposits	0	[1]	0	[2]
Short-term borrowings	0	[1]	0	[2]
Federal Home Loan Bank borrowings	0	[1]	0	[2]
Accrued interest payable	0	[1]	0	[2]
Total financial instrument liabilities	0	[1]	0	[2]
Financial instrument with off-balance sheet risk:
Loan commitments	0	[1]	0	[2]
Letters of credit	0	[1]	0	[2]
Total financial instrument liabilities with off-balance-sheet risk	0	[1]	0	[2]
Observable Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents	0	[3]	0	[3]
Investment securities	247,458	[3]	246,089	[3]
Loans held for sale	7,959	[3]	4,927	[3]
Loans
Agricultural	0	[3]	0	[3]
Commercial and financial	0	[3]	0	[3]
Real estate:
Construction, 1 to 4 family residential	0	[3]	0	[3]
Construction, land development and commercial	0	[3]	0	[3]
Mortgage, farmland	0	[3]	0	[3]
Mortgage, 1 to 4 family first liens	0	[3]	0	[3]
Mortgage, 1 to 4 family junior liens	0	[3]	0	[3]
Mortgage, multi-family	0	[3]	0	[3]
Mortgage, commercial	0	[3]	0	[3]
Loans to individuals	0	[3]	0	[3]
Obligations of state and political subdivisions	0	[3]	0	[3]
Accrued interest receivable	8,251	[3]	7,676	[3]
Total financial instrument assets	263,668	[3]	258,692	[3]
Deposits
Noninterest-bearing deposits	261,565	[3]	256,788	[3]
Interest-bearing deposits	1,468,410	[3]	1,461,454	[3]
Short-term borrowings	68,572	[3]	42,016	[3]
Federal Home Loan Bank borrowings	131,356	[3]	132,469	[3]
Accrued interest payable	930	[3]	1,102	[3]
Total financial instrument liabilities	1,930,833	[3]	1,893,829	[3]
Financial instrument with off-balance sheet risk:
Loan commitments	0	[3]	0	[3]
Letters of credit	0	[3]	0	[3]
Total financial instrument liabilities with off-balance-sheet risk	0	[3]	0	[3]
Company Determined Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents	0	[4]	0	[4]
Investment securities	0	[4]	0	[4]
Loans held for sale			0	[4]
Loans
Agricultural	89,378	[4]	86,137	[4]
Commercial and financial	190,186	[4]	176,385	[4]
Real estate:
Construction, 1 to 4 family residential	31,408	[4]	28,364	[4]
Construction, land development and commercial	72,631	[4]	65,544	[4]
Mortgage, farmland	138,847	[4]	137,938	[4]
Mortgage, 1 to 4 family first liens	618,387	[4]	595,054	[4]
Mortgage, 1 to 4 family junior liens	106,338	[4]	104,133	[4]
Mortgage, multi-family	235,599	[4]	240,595	[4]
Mortgage, commercial	314,137	[4]	310,558	[4]
Loans to individuals	20,654	[4]	19,710	[4]
Obligations of state and political subdivisions	54,929	[4]	45,184	[4]
Accrued interest receivable	0	[4]	0	[4]
Total financial instrument assets	1,872,494	[4]	1,809,602	[4]
Deposits
Noninterest-bearing deposits	0	[4]	0	[4]
Interest-bearing deposits	0	[4]	0	[4]
Short-term borrowings	0	[4]	0	[4]
Federal Home Loan Bank borrowings	0	[4]	0	[4]
Accrued interest payable	0	[4]	0	[4]
Total financial instrument liabilities	0	[4]	0	[4]
Financial instrument with off-balance sheet risk:
Loan commitments	0	[4]	0	[4]
Letters of credit	0	[4]	0	[4]
Total financial instrument liabilities with off-balance-sheet risk	0	[4]	0	[4]
Carrying Amount [Member]
Financial instrument assets:
Cash and cash equivalents	30,136		43,702
Investment securities	247,458		246,089
Loans held for sale	7,959		4,927
Loans
Agricultural	82,168		79,286
Commercial and financial	173,395		161,369
Real estate:
Construction, 1 to 4 family residential	32,641		29,298
Construction, land development and commercial	74,605		67,275
Mortgage, farmland	141,301		140,128
Mortgage, 1 to 4 family first liens	623,000		599,586
Mortgage, 1 to 4 family junior liens	107,032		104,822
Mortgage, multi-family	236,512		242,026
Mortgage, commercial	315,810		312,464
Loans to individuals	20,510		19,554
Obligations of state and political subdivisions	54,701		44,798
Accrued interest receivable	8,251		7,676
Total financial instrument assets	2,155,479		2,103,000
Deposits
Noninterest-bearing deposits	261,565		256,788
Interest-bearing deposits	1,464,759		1,453,089
Short-term borrowings	68,572		42,016
Federal Home Loan Bank borrowings	125,000		125,000
Accrued interest payable	930		1,102
Total financial instrument liabilities	1,920,826		1,877,995
Financial instrument with off-balance sheet risk:
Loan commitments	394,585		360,945
Letters of credit	14,417		11,019
Total financial instrument liabilities with off-balance-sheet risk	409,002		371,964
Estimated Fair Value [Member]
Financial instrument assets:
Cash and cash equivalents	30,136		43,702
Investment securities	247,458		246,089
Loans held for sale	7,959		4,927
Loans
Agricultural	89,378		86,137
Commercial and financial	190,186		176,385
Real estate:
Construction, 1 to 4 family residential	31,408		28,364
Construction, land development and commercial	72,631		65,544
Mortgage, farmland	138,847		137,938
Mortgage, 1 to 4 family first liens	618,387		595,054
Mortgage, 1 to 4 family junior liens	106,338		104,133
Mortgage, multi-family	235,599		240,595
Mortgage, commercial	314,137		310,558
Loans to individuals	20,654		19,710
Obligations of state and political subdivisions	54,929		45,184
Accrued interest receivable	8,251		7,676
Total financial instrument assets	2,166,298		2,111,996
Deposits
Noninterest-bearing deposits	261,565		256,788
Interest-bearing deposits	1,468,410		1,461,454
Short-term borrowings	68,572		42,016
Federal Home Loan Bank borrowings	131,356		132,469
Accrued interest payable	930		1,102
Total financial instrument liabilities	1,930,833		1,893,829
Financial instrument with off-balance sheet risk:
Loan commitments	0		0
Letters of credit	0		0
Total financial instrument liabilities with off-balance-sheet risk	$ 0		$ 0

[1] Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).

[2] Considered Level 1 under ASC 820.

[3] Considered Level 2 under ASC 820.

[4] Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.