CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 11,010us-gaap_NetIncomeLoss	$ 9,298us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	0us-gaap_ProvisionForLoanAndLeaseLosses	300us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation of premises and equipment	882us-gaap_DepreciationNonproduction	783us-gaap_DepreciationNonproduction
Net amortization of premium and discount	358	219
Net amortization of intangibles	155us-gaap_AmortizationOfIntangibleAssets	164us-gaap_AmortizationOfIntangibleAssets
Share-based compensation	580us-gaap_ShareBasedCompensation	491us-gaap_ShareBasedCompensation
Income from bank-owned life insurance	(490)us-gaap_BankOwnedLifeInsuranceIncome	(445)us-gaap_BankOwnedLifeInsuranceIncome
Net gain on sale of business line	0wash_GainonSaleofBusinessLineBeforeTax	(6,265)wash_GainonSaleofBusinessLineBeforeTax
Net gains on loan sales and commissions on loans originated for others	(2,585)us-gaap_GainLossOnSalesOfLoansNet	(1,239)us-gaap_GainLossOnSalesOfLoansNet
Net losses (gains) on interest rate swap contracts	(645)	(260)
Equity in earnings (losses) of unconsolidated subsidiaries	86	43
Proceeds from sales of loans	117,571	48,296
Loans originated for sale	(116,502)	(46,159)
Decrease (increase) in other assets	814	(81)
Decrease in other liabilities	(1,936)	(3,723)
Net cash provided by operating activities	9,298	1,422
Cash flows from investing activities:
Proceeds from sale of other investment securities available for sale	0	547
Maturities and principal payments of mortgage-backed securities available for sale	12,533	11,313
Maturities and principal payments of other investment securities available for sale	4,986	20,844
Maturities and principal payments of mortgage-backed securities held to maturity	1,137	960
Net proceeds from sale of business line	0	7,205
Net increase in loans	(20,620)	(13,584)
Purchases of loans, including purchased interest	(856)	(2,934)
Proceeds from the sale of property acquired through foreclosure or repossession	0	659
Purchases of premises and equipment	(1,226)	(1,291)
Net cash (used in) provided by investing activities	(4,046)	23,719
Cash flows from financing activities:
Net increase (decrease) in deposits	28,325us-gaap_IncreaseDecreaseInDeposits	86,333us-gaap_IncreaseDecreaseInDeposits
Net increase (decrease) in other borrowings	(12)	(11)
Proceeds from Federal Home Loan Bank advances	120,000	54,000
Repayment of Federal Home Loan Bank advances	(140,305)	(138,653)
Proceeds from the exercise of stock options and issuance of other compensation-related equity instruments	698	496
Tax benefit from stock option exercises and issuance of other compensation-related equity instruments	106	45
Cash dividends paid	(5,381)us-gaap_PaymentsOfDividends	(4,511)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	3,431	(2,301)
Net increase in cash and cash equivalents	8,683	22,840
Cash and cash equivalents at beginning of period	80,350	85,317
Cash and cash equivalents at end of period	89,033	108,157
Noncash Investing and Financing Activities:
Loans charged off	321	1,223
Loans transferred to property acquired through foreclosure or repossession	230	421
Supplemental Disclosures:
Interest payments	5,459us-gaap_InterestPaid	5,175us-gaap_InterestPaid
Income tax payments	$ 310us-gaap_IncomeTaxesPaid	$ 265us-gaap_IncomeTaxesPaid

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing made from Federal Home Loan Bank.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the maturity (principal due), prepayment and call (request of early payment) of a loan financed by home mortgage payments classified as held to maturity.

+ References

+ Details

Name:	us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow associated with the maturity (principal being due), prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 21

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3461-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 230

-Section 55

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=34726456&loc=d3e60097-112785

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3337-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the payment of loan drawn from Federal Home Loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of gain recognized in connection with the sale of the merchant processing service business line before income taxes.

+ References

No definition available.

+ Details

Name:	wash_GainonSaleofBusinessLineBeforeTax
Namespace Prefix:	wash_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Reductions in the entity's income taxes that arise when compensation cost (from stock option and other equity instruments compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

+ References

No definition available.

+ Details

Name:	wash_TaxBenefitFromStockOptionExercisesAndIssuanceOfOtherCompensationRelatedEquityInstruments
Namespace Prefix:	wash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Transfer of Loans Net to Foreclosed Properties and Repossessions

+ References

No definition available.

+ Details

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Namespace Prefix:	wash_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration