Fair Value Measurements Estimated fair values and related carrying values of financial instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Level I [Member]
Financial assets:
Cash and cash equivalents	$ 53,063	$ 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	0
Interest rate swaps	0	0
Mortgage banking hedge instruments	0	0
Mortgage servicing rights	0	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	325,030	327,935
Loans held for sale	31,771	33,175
Loans, net	7,038	5,756
Bank owned life insurance	22,117	21,955
Accrued interest receivable	3,916	3,992
Mortgage interest rate locks	211	16
Interest rate swaps	235	333
Mortgage banking hedge instruments	6	202
Mortgage servicing rights	251	203
Financial liabilities:
Deposits	963,068	984,420
Securities sold under agreements to repurchase	32,617	34,539
FHLB borrowings	80,356	80,666
Subordinated notes	5,178	5,198
Accrued interest payable	451	501
Interest rate swaps	292	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	722,403	720,483
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Mortgage interest rate locks	0	0
Interest rate swaps	0	0
Mortgage banking hedge instruments	0	0
Mortgage servicing rights	0	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	53,063	67,343
Securities available for sale	325,520	328,423
Loans held for sale	31,771	33,175
Loans, net	718,236	715,160
Bank owned life insurance	22,117	21,955
Accrued interest receivable	3,916	3,992
Mortgage interest rate locks	211	16
Interest rate swaps	235	333
Mortgage banking hedge instruments	6	202
Mortgage servicing rights	251	203
Financial liabilities:
Deposits	961,251	982,396
Securities sold under agreements to repurchase	32,617	34,539
FHLB borrowings	80,000	80,000
Subordinated notes	5,155	5,155
Accrued interest payable	451	501
Interest rate swaps	292	303
Fair Value [Member]
Financial assets:
Cash and cash equivalents	53,063	67,343
Securities available for sale	325,520	328,423
Loans held for sale	31,771	33,175
Loans, net	729,441	726,239
Bank owned life insurance	22,117	21,955
Accrued interest receivable	3,916	3,992
Mortgage interest rate locks	211	16
Interest rate swaps	235	333
Mortgage banking hedge instruments	6	202
Mortgage servicing rights	251	203
Financial liabilities:
Deposits	963,068	984,420
Securities sold under agreements to repurchase	32,617	34,539
FHLB borrowings	80,356	80,666
Subordinated notes	5,178	5,198
Accrued interest payable	451	501
Interest rate swaps	$ 292	$ 303