Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial assets:
Available-for-sale investment securities	$ 427,811us-gaap_AvailableForSaleSecurities	$ 432,535us-gaap_AvailableForSaleSecurities
Held-to-maturity investment securities	32,096us-gaap_HeldToMaturitySecurities	31,964us-gaap_HeldToMaturitySecurities
Carrying Value
Financial assets:
Cash and due from banks	27,213	21,316
Interest-earning deposits in other banks	57,974	55,646
Federal funds sold	184	366
Available-for-sale investment securities	427,811	432,535
Held-to-maturity investment securities	32,096	31,964
Loans, net	568,594	564,280
Federal Home Loan Bank stock	4,791	4,791
Accrued interest receivable	5,203	5,793
Financial liabilities:
Deposits	1,041,863	1,039,152
Junior subordinated deferrable interest debentures	5,155	5,155
Accrued interest payable	111	114
Level 1
Financial assets:
Cash and due from banks	27,213	21,316
Interest-earning deposits in other banks	57,974	55,646
Federal funds sold	184	366
Available-for-sale investment securities	7,655	7,585
Held-to-maturity investment securities	0	0
Loans, net	0	0
Accrued interest receivable	24	25
Financial liabilities:
Deposits	890,367	885,704
Junior subordinated deferrable interest debentures	0	0
Accrued interest payable	0	0
Level 2
Financial assets:
Cash and due from banks	0	0
Interest-earning deposits in other banks	0	0
Federal funds sold	0	0
Available-for-sale investment securities	420,156	424,950
Held-to-maturity investment securities	35,486	35
Loans, net	0	0
Accrued interest receivable	2,811	3,212
Financial liabilities:
Deposits	151,438	153,475
Junior subordinated deferrable interest debentures	0	0
Accrued interest payable	87	90
Level 3
Financial assets:
Cash and due from banks	0	0
Interest-earning deposits in other banks	0	0
Federal funds sold	0	0
Available-for-sale investment securities	0	0
Held-to-maturity investment securities	0	0
Loans, net	566,525	564,667
Accrued interest receivable	2,368	2,556
Financial liabilities:
Deposits	0	0
Junior subordinated deferrable interest debentures	3,175	3,119
Accrued interest payable	24	24
Fair Value
Financial assets:
Cash and due from banks	27,213	21,316
Interest-earning deposits in other banks	57,974	55,646
Federal funds sold	184	366
Available-for-sale investment securities	427,811	432,535
Held-to-maturity investment securities	35,486	35
Loans, net	566,525	564,667
Accrued interest receivable	5,203	5,793
Financial liabilities:
Deposits	1,041,805	1,039,179
Junior subordinated deferrable interest debentures	3,175	3,119
Accrued interest payable	$ 111	$ 114

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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