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Securities (Carrying Value of Securities Pledged as Collateral) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
|
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Carrying amount of securities pledged as collateral | $ 362,787 | $ 374,730 |
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To Washington and Oregon State To Secure Public Deposits [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Carrying amount of securities pledged as collateral | 277,012 | 281,006 |
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To Federal Reserve Bank To Secure Borrowings [Member]
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||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Carrying amount of securities pledged as collateral | 42,694 | 47,634 |
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Other Securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Carrying amount of securities pledged as collateral | $ 43,081 | $ 46,090 |