Fair Value of Financial Instruments (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Investment securities
Bank-owned life insurance	$ 25,022,000	$ 16,362,000
Accrued interest receivable	4,999,000	4,099,000
Financial liabilities
Interest-bearing deposits	744,265,000	527,073,000
Noninterest-bearing deposits	211,096,000	114,953,000
Quoted Prices in Active Markets for Identical Assets (Level I)
Financial assets
Cash and cash equivalents	28,439,000	15,142,000
Investment securities
Available for sale	12,060,000	11,653,000
Loans held for sale	5,409,000	3,774,000
Bank-owned life insurance	25,022,000	16,362,000
Accrued interest receivable	4,999,000	4,099,000
Financial liabilities
Interest-bearing deposits	484,783,000	359,979,000
Noninterest-bearing deposits	211,096,000	114,953,000
Short-term borrowings	39,000,000	33,204,000
Accrued interest payable	442,000	366,000
Significant Other Observable Inputs (Level II)
Investment securities
Available for sale	299,229,000	277,663,000
Significant Unobservable Inputs (Level III)
Investment securities
Loans, net	774,344,000	506,406,000
Financial liabilities
Interest-bearing deposits	239,142,000	170,506,000
Long-term borrowings, FHLB	73,067,000	80,772,000
Carrying Value
Financial assets
Cash and cash equivalents	28,439,000	15,142,000
Investment securities
Available for sale	311,289,000	289,316,000
Loans held for sale	5,409,000	3,774,000
Loans, net	777,557,000	504,615,000
Bank-owned life insurance	25,022,000	16,362,000
Accrued interest receivable	4,999,000	4,099,000
Financial liabilities
Interest-bearing deposits	744,265,000	527,073,000
Noninterest-bearing deposits	211,096,000	114,953,000
Short-term borrowings	39,000,000	33,204,000
Long-term borrowings, FHLB	70,750,000	76,278,000
Accrued interest payable	442,000	366,000
Fair Value
Financial assets
Cash and cash equivalents	28,439,000	15,142,000
Investment securities
Available for sale	311,289,000	289,316,000
Loans held for sale	5,409,000	3,774,000
Loans, net	774,344,000	506,406,000
Bank-owned life insurance	25,022,000	16,362,000
Accrued interest receivable	4,999,000	4,099,000
Financial liabilities
Interest-bearing deposits	723,925,000	530,485,000
Noninterest-bearing deposits	211,096,000	114,953,000
Short-term borrowings	39,000,000	33,204,000
Long-term borrowings, FHLB	73,067,000	80,772,000
Accrued interest payable	$ 442,000	$ 366,000

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