Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 187,790	$ 173,448
Capital to risk weighted assets	12.12%	12.81%
Capital required for capital adequacy	$ 123,979	$ 108,281
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Tier one risk based capital	$ 172,807	$ 159,841
Tier one risk based capital to risk weighted assets	11.15%	11.81%
Tier one risk based capital required for capital adequacy	$ 92,984	$ 54,140
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	4.00%
Common equity tier one capital	$ 152,807
Common equity tier one capital to risk weighted assets	9.86%
Common equity tier one capital required for capital adequacy	$ 69,738
Common equity tier one capital required for capital adequacy to risk weighted assets	4.50%
Tier one leverage capital	$ 172,807	$ 159,841
Tier one leverage capital to average assets	9.91%	10.17%
Tier one leverage capital required for capital adequacy	$ 69,764	$ 62,848
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tangible capital to tangible assets	8.71%	8.68%
Intangible assets	$ 0	$ 0
West Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 174,450	$ 163,253
Capital to risk weighted assets	11.32%	12.19%
Capital required for capital adequacy	$ 123,279	$ 107,099
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required to be well capitalized	$ 154,099	$ 133,874
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier one risk based capital	$ 159,467	$ 149,646
Tier one risk based capital to risk weighted assets	10.35%	11.18%
Tier one risk based capital required for capital adequacy	$ 92,460	$ 53,549
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	4.00%
Tier one risk based capital required to be well capitalized	$ 123,279	$ 80,324
Tier one risk based capital required to be well capitalized to risk weighted assets	8.00%	6.00%
Common equity tier one capital	$ 159,467
Common equity tier one capital to risk weighted assets	10.35%
Common equity tier one capital required for capital adequacy	$ 69,345
Common equity tier one capital required for capital adequacy to risk weighted assets	4.50%
Common equity tier one capital required to be well capitalized	$ 100,164
Common equity tier one capital required to be well capitalized to risk weighted assets	6.50%
Tier one leverage capital	$ 159,467	$ 149,646
Tier one leverage capital to average assets	9.20%	9.62%
Tier one leverage capital required for capital adequacy	$ 69,352	$ 62,203
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required to be well capitalized	$ 86,690	$ 77,754
Tier one leverage capital required to be well capitalized to average assets	5.00%	5.00%