Fair Value Measurements Estimated fair values and related carrying values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Securities held to maturity	$ 4,163	$ 1,397
Level I [Member]
Financial assets:
Cash and cash equivalents	39,228	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 contracts		0
Financial liabilities:
Deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLB borrowings	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Interest rate contracts		0
Level II [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities held to maturity	4,163	1,397
Securities available for sale	374,571	348,263
Loans, net	0	1,289
Bank owned life insurance	23,273	22,617
Accrued interest receivable	5,204	4,285
Interest rate contracts		50
Financial liabilities:
Deposits	1,040,016	989,563
Securities sold under agreements to repurchase	26,869	38,551
FHLB borrowings	85,033	55,042
Subordinated notes	5,157	5,159
Accrued interest payable	410	403
Interest rate contracts		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	802,535	750,283
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Interest rate contracts		0
Financial liabilities:
Deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLB borrowings	0	0
Subordinated notes	0	0
Accrued interest payable	0	0
Interest rate contracts		0
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	39,228	55,022
Securities held to maturity	4,207	1,500
Securities available for sale	374,571	348,263
Loans, net	794,635	743,060
Bank owned life insurance	23,273	22,617
Accrued interest receivable	5,204	4,285
Interest rate contracts		50
Financial liabilities:
Deposits	1,040,800	989,080
Securities sold under agreements to repurchase	26,869	38,551
FHLB borrowings	85,000	55,000
Subordinated notes	5,155	5,155
Accrued interest payable	410	403
Interest rate contracts		337
Fair Value [Member]
Financial assets:
Cash and cash equivalents	39,228	55,022
Securities held to maturity	4,163	1,397
Securities available for sale	374,571	348,263
Loans, net	802,535	751,572
Bank owned life insurance	23,273	22,617
Accrued interest receivable	5,204	4,285
Interest rate contracts		50
Financial liabilities:
Deposits	1,040,016	989,563
Securities sold under agreements to repurchase	26,869	38,551
FHLB borrowings	85,033	55,042
Subordinated notes	5,157	5,159
Accrued interest payable	410	403
Interest rate contracts		$ 337
Interest Rate Swap [Member] | Level I [Member]
Financial assets:
Interest rate contracts	0
Financial liabilities:
Interest rate contracts	0
Interest Rate Swap [Member] | Level II [Member]
Financial assets:
Interest rate contracts	73
Financial liabilities:
Interest rate contracts	370
Interest Rate Swap [Member] | Level III [Member]
Financial assets:
Interest rate contracts	0
Financial liabilities:
Interest rate contracts	0
Interest Rate Swap [Member] | Carrying Amount [Member]
Financial assets:
Interest rate contracts	73
Financial liabilities:
Interest rate contracts	370
Interest Rate Swap [Member] | Fair Value [Member]
Financial assets:
Interest rate contracts	73
Financial liabilities:
Interest rate contracts	370
Interest Rate Cap [Member] | Level I [Member]
Financial assets:
Interest rate contracts	0
Interest Rate Cap [Member] | Level II [Member]
Financial assets:
Interest rate contracts	39
Interest Rate Cap [Member] | Level III [Member]
Financial assets:
Interest rate contracts	0
Interest Rate Cap [Member] | Carrying Amount [Member]
Financial assets:
Interest rate contracts	39
Interest Rate Cap [Member] | Fair Value [Member]
Financial assets:
Interest rate contracts	$ 39