Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial assets:
Available-for-sale investment securities	$ 432,535,000us-gaap_AvailableForSaleSecurities	$ 443,224,000us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities	31,964,000us-gaap_HeldToMaturitySecurities	0us-gaap_HeldToMaturitySecurities
Valuation allowance	8,308,000	9,208,000	10,133,000	11,396,000
Carrying Value
Financial assets:
Cash and due from banks	21,316,000	25,878,000
Interest-earning deposits in other banks	55,646,000	85,956,000
Federal funds sold	366,000	218,000
Available-for-sale investment securities	432,535,000	443,224,000
Held-to-maturity Securities	31,964,000
Loans, net	564,280,000	503,149,000
Federal Home Loan Bank stock	4,791,000	4,499,000
Accrued interest receivable	5,793,000	5,026,000
Financial liabilities:
Deposits	1,039,152,000	1,004,143,000
Junior subordinated deferrable interest debentures	5,155,000	5,155,000
Accrued interest payable	114,000	129,000
Level 1
Financial assets:
Cash and due from banks	21,316,000	25,878,000
Interest-earning deposits in other banks	55,646,000	85,956,000
Federal funds sold	366,000	218,000
Available-for-sale investment securities	7,585,000	7,514,000
Held-to-maturity Securities	0
Loans, net	0	0
Accrued interest receivable	25,000	21,000
Financial liabilities:
Deposits	885,704,000	834,864,000
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	424,950,000	435,710,000
Held-to-maturity Securities	35,096,000
Loans, net	0	0
Accrued interest receivable	3,212,000	2,976,000
Financial liabilities:
Deposits	153,475,000	169,065,000
Junior subordinated deferrable interest debentures	0	0
Accrued interest payable	90,000	105,000
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 Securities	0
Loans, net	564,667,000	507,361,000
Accrued interest receivable	2,556,000	2,029,000
Financial liabilities:
Deposits	0	0
Junior subordinated deferrable interest debentures	3,119,000	2,750,000
Accrued interest payable	24,000	24,000
Fair Value
Financial assets:
Cash and due from banks	21,316,000	25,878,000
Interest-earning deposits in other banks	55,646,000	85,956,000
Federal funds sold	366,000	218,000
Available-for-sale investment securities	432,535,000	443,224,000
Held-to-maturity Securities	35,096,000
Loans, net	564,667,000	507,361,000
Accrued interest receivable	5,793,000	5,026,000
Valuation allowance	3,921,000	0
Financial liabilities:
Deposits	1,039,179,000	1,003,929,000
Junior subordinated deferrable interest debentures	3,119,000	2,750,000
Accrued interest payable	114,000	129,000
Allowance for Loan and Lease Losses, Write-offs	$ 3,539,000	$ 0

Accrued Interest Payable, Fair Value Disclosure

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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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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