Fair Value Measurements Estimated fair values and related carrying values of financial instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Level I [Member]
Financial assets:
Cash and cash equivalents	$ 79,125	$ 67,343
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net	0	0
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Mortgage interest rate locks		0
Interest rate swaps	0	0
Mortgage banking hedge instruments		0
Mortgage servicing rights		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 swaps	0	0
Level II [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale	334,544	327,935
Loans held for sale	0	33,175
Loans, net	1,396	5,756
Bank owned life insurance	22,450	21,955
Accrued interest receivable	3,964	3,992
Mortgage interest rate locks		16
Interest rate swaps	164	334
Mortgage banking hedge instruments		202
Mortgage servicing rights		203
Financial liabilities:
Deposits	987,276	984,420
Securities sold under agreements to repurchase	36,469	34,539
FHLB borrowings	45,275	80,666
Subordinated notes	5,186	5,198
Accrued interest payable	378	501
Interest rate swaps	248	303
Level III [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale	490	488
Loans held for sale	0	0
Loans, net	724,915	720,483
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Mortgage interest rate locks		0
Interest rate swaps	0	0
Mortgage banking hedge instruments		0
Mortgage servicing rights		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 swaps	0	0
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	79,125	67,343
Securities available for sale	335,034	328,423
Loans held for sale	0	33,175
Loans, net	717,329	715,160
Bank owned life insurance	22,450	21,955
Accrued interest receivable	3,964	3,992
Mortgage interest rate locks		16
Interest rate swaps	164	334
Mortgage banking hedge instruments		202
Mortgage servicing rights		203
Financial liabilities:
Deposits	986,566	982,396
Securities sold under agreements to repurchase	36,469	34,539
FHLB borrowings	45,000	80,000
Subordinated notes	5,155	5,155
Accrued interest payable	378	501
Interest rate swaps	248	303
Fair Value [Member]
Financial assets:
Cash and cash equivalents	79,125	67,343
Securities available for sale	335,034	328,423
Loans held for sale	0	33,175
Loans, net	726,311	726,239
Bank owned life insurance	22,450	21,955
Accrued interest receivable	3,964	3,992
Mortgage interest rate locks		16
Interest rate swaps	164	334
Mortgage banking hedge instruments		202
Mortgage servicing rights		203
Financial liabilities:
Deposits	987,276	984,420
Securities sold under agreements to repurchase	36,469	34,539
FHLB borrowings	45,275	80,666
Subordinated notes	5,186	5,198
Accrued interest payable	378	501
Interest rate swaps	$ 248	$ 303