Goodwill and Other Intangible Assets (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Finite-Lived Intangible Assets [Line Items] | ||||
Goodwill additions | $ 88,800,000 | $ 0 | $ 88,800,000.0 | $ 0 |
Goodwill impairment charges | $ 0 | $ 0 | $ 0 | $ 0 |
Washington Banking | Core Deposits
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Finite-Lived Intangible Assets [Line Items] | ||||
Useful life | 10 years | |||
Valley | Core Deposits
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Finite-Lived Intangible Assets [Line Items] | ||||
Useful life | 10 years | |||
Northwest Commercial Bank | Core Deposits
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Finite-Lived Intangible Assets [Line Items] | ||||
Useful life | 5 years | |||
Pierce Commercial Bank | Core Deposits
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Finite-Lived Intangible Assets [Line Items] | ||||
Useful life | 4 years | |||
Cowlitz Bank | Core Deposits
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Finite-Lived Intangible Assets [Line Items] | ||||
Useful life | 9 years | |||
Western Washington Bancorp | Core Deposits
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Finite-Lived Intangible Assets [Line Items] | ||||
Useful life | 8 years |