Regulatory Capital Matters (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Total risk-based capital ratio, Amount [Abstract]
Actual amount	$ 218,470	$ 210,545
Actual ratio (in hundredths)	19.76%	19.39%
For capital adequacy amount	88,435	86,856
For capital adequacy minimum ratio (in hundredths)	8.00%	8.00%
Tier One Risk Based Capital [Abstract]
Actual amount	204,431	196,889
Actual ratio (in hundredths)	18.49%	18.13%
For capital adequacy amount	44,217	43,428
For capital adequacy minimum ratio (in hundredths)	4.00%	4.00%
Tier One Leverage Capital [Abstract]
Actual amount	204,431	196,889
Actual ratio (in hundredths)	12.41%	11.78%
For capital adequacy amount	65,887	66,858
For capital adequacy minimum ratio (in hundredths)	4.00%	4.00%
Whidbey Island Bank [Member]
Total risk-based capital ratio, Amount [Abstract]
Actual amount	211,954	203,471
Actual ratio (in hundredths)	19.20%	18.77%
For capital adequacy amount	88,330	86,715
For capital adequacy minimum ratio (in hundredths)	8.00%	8.00%
To be well capitalized amount	110,413	108,393
To be well capitalized under prompt corrective action provisions minimum ratio (in hundredths)	10.00%	10.00%
Tier One Risk Based Capital [Abstract]
Actual amount	197,931	189,837
Actual ratio (in hundredths)	17.93%	17.51%
For capital adequacy amount	44,165	43,357
For capital adequacy minimum ratio (in hundredths)	4.00%	4.00%
To be well capitalized amount	66,248	65,036
To be well capitalized under prompt corrective action provisions minimum ratio (in hundredths)	6.00%	6.00%
Tier One Leverage Capital [Abstract]
Actual amount	197,931	189,837
Actual ratio (in hundredths)	12.02%	11.36%
For capital adequacy amount	65,855	66,820
For capital adequacy minimum ratio (in hundredths)	4.00%	4.00%
To be well capitalized amount	$ 82,319	$ 83,525
To be well capitalized under prompt corrective action provisions minimum ratio (in hundredths)	5.00%	5.00%