Fair Value Measurement, by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financial assets [Abstract]
Securities available-for-sale	$ 301,028	$ 341,665
Securities held-to-maturity	148,559	151,168
Carrying Value [Member]
Financial assets [Abstract]
Cash and cash equivalents	63,935	59,731
Securities available-for-sale	301,028	341,665
Securities held-to-maturity	148,927	155,523
Other investments	12,090	11,526
Loans, net	1,215,107	1,128,775
Cash surrender value of life insurance policies	13,544	13,450
Financial liabilities [Abstract]
Non-interest-bearing deposits	389,734	383,257
Interest-bearing deposits	1,135,688	1,135,546
Securities sold under agreements to repurchase	67,574	53,916
Short-term Federal Home Loan Bank advances	35,000	25,000
Notes payable	26,990	27,703
Junior subordinated debentures	29,384	29,384
Fair Value [Member] | Level 1 [Member]
Financial assets [Abstract]
Cash and cash equivalents	63,935	59,731
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Other investments	12,090	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	67,574	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	301,028	341,665
Securities held-to-maturity	148,559	151,168
Other investments	0	0
Loans, net	0	0
Cash surrender value of life insurance policies	13,544	13,450
Financial liabilities [Abstract]
Non-interest-bearing deposits	389,734	383,257
Interest-bearing deposits	915,178	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	1,232,806	1,139,740
Cash surrender value of life insurance policies	0	0
Financial liabilities [Abstract]
Non-interest-bearing deposits	0	0
Interest-bearing deposits	221,008	241,359
Securities sold under agreements to repurchase	0	0
Short-term Federal Home Loan Bank advances	0	0
Notes payable	28,082	28,813
Junior subordinated debentures	$ 7,224	$ 7,776