Fair Value Measurements Estimated fair values and related carrying values of financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financial assets:
Securities held to maturity	$ 1,374	$ 1,397
Level I [Member]
Financial assets:
Cash and cash equivalents	49,407	55,022
Securities held to maturity	0	0
Securities available for sale	0	0
Loans, net	0	0
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Interest rate swaps	0	0
Financial liabilities:
Deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLB borrowings	0	0
Subordinated debt	0	0
Accrued interest payable	0	0
Interest rate swaps	0	0
Level II [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities held to maturity	1,374	1,397
Securities available for sale	351,990	348,263
Loans, net	3,156	1,289
Bank owned life insurance	22,940	22,617
Accrued interest receivable	4,785	4,285
Interest rate swaps	52	50
Financial liabilities:
Deposits	1,005,476	989,563
Securities sold under agreements to repurchase	24,049	38,551
FHLB borrowings	69,701	55,042
Subordinated debt	5,133	5,159
Accrued interest payable	363	403
Interest rate swaps	341	337
Level III [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Securities available for sale	0	0
Loans, net	765,958	750,283
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Interest rate swaps	0	0
Financial liabilities:
Deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLB borrowings	0	0
Subordinated debt	0	0
Accrued interest payable	0	0
Interest rate swaps	0	0
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	49,407	55,022
Securities held to maturity	1,500	1,500
Securities available for sale	351,990	348,263
Loans, net	761,196	743,060
Bank owned life insurance	22,940	22,617
Accrued interest receivable	4,785	4,285
Interest rate swaps	52	50
Financial liabilities:
Deposits	1,005,452	989,080
Securities sold under agreements to repurchase	24,049	38,551
FHLB borrowings	70,000	55,000
Subordinated debt	5,155	5,155
Accrued interest payable	363	403
Interest rate swaps	341	337
Fair Value [Member]
Financial assets:
Cash and cash equivalents	49,407	55,022
Securities held to maturity	1,374	1,397
Securities available for sale	351,990	348,263
Loans, net	769,114	751,572
Bank owned life insurance	22,940	22,617
Accrued interest receivable	4,785	4,285
Interest rate swaps	52	50
Financial liabilities:
Deposits	1,005,476	989,563
Securities sold under agreements to repurchase	24,049	38,551
FHLB borrowings	69,701	55,042
Subordinated debt	5,133	5,159
Accrued interest payable	363	403
Interest rate swaps	$ 341	$ 337