Fair Value Measurement, by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financial assets [Abstract]
Securities available-for-sale	$ 288,397	$ 341,665	[1]
Securities held-to-maturity	144,597	151,168
Carrying Value [Member]
Financial assets [Abstract]
Cash and cash equivalents	54,215	59,731
Securities available-for-sale	288,397	341,665
Securities held-to-maturity	145,030	155,523
Other investments	12,091	11,526
Loans, net	1,238,948	1,128,775
Cash surrender value of life insurance policies	13,565	13,450
Financial liabilities [Abstract]
Non-interest-bearing deposits	396,263	383,257
Interest-bearing deposits	1,124,581	1,135,546
Securities sold under agreements to repurchase	70,964	53,916
Short-term Federal Home Loan Bank advances	35,000	25,000
Notes payable	26,384	27,703
Junior subordinated debentures	22,167	29,384
Fair Value [Member] | Level 1 [Member]
Financial assets [Abstract]
Cash and cash equivalents	54,215	59,731
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Other investments	12,091	11,526
Loans, net	0	0
Cash surrender value of life insurance policies	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0
Interest-bearing deposits	0	0
Securities sold under agreements to repurchase	70,964	53,916
Short-term Federal Home Loan Bank advances	0	0
Notes payable	0	0
Junior subordinated debentures	0	0
Fair Value [Member] | Level 2 [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Securities available-for-sale	288,397	341,665
Securities held-to-maturity	144,597	151,168
Other investments	0	0
Loans, net	0	0
Cash surrender value of life insurance policies	13,565	13,450
Financial liabilities [Abstract]
Non-interest-bearing deposits	396,263	383,257
Interest-bearing deposits	909,014	895,346
Securities sold under agreements to repurchase	0	0
Short-term Federal Home Loan Bank advances	35,000	25,000
Notes payable	0	0
Junior subordinated debentures	22,167	22,167
Fair Value [Member] | Level 3 [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Other investments	0	0
Loans, net	1,247,751	1,139,740
Cash surrender value of life insurance policies	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0
Interest-bearing deposits	215,623	241,359
Securities sold under agreements to repurchase	0	0
Short-term Federal Home Loan Bank advances	0	0
Notes payable	27,297	28,813
Junior subordinated debentures	$ 0	$ 7,776

[1] Derived from audited financial statements.