CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 40,824us-gaap_NetIncomeLoss	$ 36,153us-gaap_NetIncomeLoss	$ 35,074us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,850us-gaap_ProvisionForLoanAndLeaseLosses	2,400us-gaap_ProvisionForLoanAndLeaseLosses	2,700us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation of premises and equipment	3,133us-gaap_DepreciationNonproduction	3,283us-gaap_DepreciationNonproduction	3,213us-gaap_DepreciationNonproduction
Foreclosed and repossessed property valuation adjustments	78	79	350
Net gain on sale of premises	0	0	(358)
Net amortization of premium and discount	999	1,401	2,127
Amortization of intangibles	644us-gaap_AmortizationOfIntangibleAssets	680us-gaap_AmortizationOfIntangibleAssets	728us-gaap_AmortizationOfIntangibleAssets
Share–based compensation	1,880us-gaap_ShareBasedCompensation	1,876us-gaap_ShareBasedCompensation	1,962us-gaap_ShareBasedCompensation
Deferred income tax expense	1,847us-gaap_DeferredIncomeTaxExpenseBenefit	2,267us-gaap_DeferredIncomeTaxExpenseBenefit	1,328us-gaap_DeferredIncomeTaxExpenseBenefit
Income from bank-owned life insurance	(1,846)us-gaap_BankOwnedLifeInsuranceIncome	(1,850)us-gaap_BankOwnedLifeInsuranceIncome	(2,448)us-gaap_BankOwnedLifeInsuranceIncome
Net gain on sale of business line	(6,265)wash_GainonSaleofBusinessLineBeforeTax	0wash_GainonSaleofBusinessLineBeforeTax	0wash_GainonSaleofBusinessLineBeforeTax
Net gains on loan sales and commissions on loans originated for others	(6,802)us-gaap_GainLossOnSalesOfLoansNet	(13,085)us-gaap_GainLossOnSalesOfLoansNet	(14,092)us-gaap_GainLossOnSalesOfLoansNet
Net realized gains on securities	0us-gaap_GainLossOnSaleOfSecuritiesNet	0us-gaap_GainLossOnSaleOfSecuritiesNet	(1,223)us-gaap_GainLossOnSaleOfSecuritiesNet
Net impairment losses recognized in earnings	0	3,489	221
Net gains on interest rate swap contracts	(1,136)	(951)	(255)
Equity in (earnings) losses of unconsolidated subsidiaries	276	107	(196)
Proceeds from sales of loans	257,244	415,186	479,925
Loans originated for sale	(285,938)	(369,045)	(495,271)
(Increase) decrease in other assets	(7,192)	2,589	(7,987)
Increase (decrease) in other liabilities	3,097	(3,729)	(331)
Net cash provided by operating activities	2,693	80,850	5,467
Cash flows from investing activities:
Purchases of mortgage-backed securities available for sale	(53,051)	(91,928)	0
Purchases of other investment securities available for sale	(31,208)	(25,404)	0
Proceeds from sale of mortgage-backed securities available for sale	0	0	40,222
Proceeds from sale of other investment securities available for sale	547	0	1,936
Maturities and principal payments of mortgage-backed securities available for sale	76,703	77,644	111,906
Maturities and principal payments of other investment securities available for sale	43,012	10,720	5,813
Maturities and principal payments of mortgage-backed securities held to maturity	4,445	9,993	11,177
Remittance of Federal Home Loan Bank stock	0	2,688	1,590
Net proceeds from sale of business line	7,205	0	0
Net increase in loans	(389,649)	(208,125)	(138,084)
Proceeds from sale of portfolio loans	1,200wash_SaleofPortfolioLoans	49,588wash_SaleofPortfolioLoans	0wash_SaleofPortfolioLoans
Purchases of loans, including purchased interest	(8,119)	(10,645)	(10,469)
Proceeds from the sale of property acquired through foreclosure or repossession	1,769	2,588	3,366
Purchases of premises and equipment	(5,226)	(1,491)	(5,110)
Net proceeds from sale of premises	0	0	1,571
Purchases of bank-owned life insurance	(5,000)	0	0
Proceeds from bank-owned life insurance	0	0	1,419
Repayment of investment in capital trust	0	310	0
Net cash (used in) provided by investing activities	(357,372)	(184,062)	25,337
Cash flows from financing activities:
Net increase in deposits	249,497us-gaap_IncreaseDecreaseInDeposits	192,690us-gaap_IncreaseDecreaseInDeposits	186,316us-gaap_IncreaseDecreaseInDeposits
Net decrease in other borrowings	(45)	(1,034)	(18,546)
Proceeds from Federal Home Loan Bank advances	602,499	204,000	627,179
Repayment of Federal Home Loan Bank advances	(484,284)	(277,090)	(806,457)
Proceeds from stock option exercises and issuance of other equity instruments	1,189	3,681	1,257
Tax benefit from stock option exercises and other equity instruments	578	570	210
Cash dividends paid	(19,722)us-gaap_PaymentsOfDividends	(16,628)us-gaap_PaymentsOfDividends	(15,133)us-gaap_PaymentsOfDividends
Redemption of junior subordinated debentures	0us-gaap_RepaymentsOfLongTermDebt	(10,310)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Net cash provided by (used in) financing activities	349,712	95,879	(25,174)
Net (decrease) increase in cash and cash equivalents	(4,967)	(7,333)	5,630
Cash and cash equivalents at beginning of year	85,317	92,650	87,020
Cash and cash equivalents at end of year	80,350	85,317	92,650
Noncash Investing and Financing Activities:
Loans charged off	1,949	6,022	2,335
Loans transferred to property acquired through foreclosure or repossession	1,961	1,471	3,167
OREO proceeds due from attorney	0	0	132
Supplemental Disclosures:
Interest payments	21,862us-gaap_InterestPaid	24,194us-gaap_InterestPaid	29,657us-gaap_InterestPaid
Income tax payments	$ 15,515us-gaap_IncomeTaxesPaid	$ 13,618us-gaap_IncomeTaxesPaid	$ 14,777us-gaap_IncomeTaxesPaid

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-Name Regulation S-X (SX)

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-Section 04

-Paragraph 20

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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The amount of cash paid for the origination of mortgages that are held for sale.

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Amount of cash outflow (inflow) from acquisition (sale) of Federal Home Loan Bank (FHLBank) stock.

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The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow for payments to purchase life insurance policies for which the entity is the beneficiary.

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The cash outflow associated with purchasing loans held for investment purposes during the period.

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The cash outflow for the purchase of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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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.

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

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-Glossary Financing Activities

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

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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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.

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-Glossary Investing Activities

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-Paragraph 12

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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.

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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.

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

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-Glossary Financing Activities

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

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Paragraph 12

-Subparagraph (a),(b)

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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.

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

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-Name Accounting Standards Codification

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-Paragraph 16

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The cash inflow from the sale of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.

+ References

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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

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

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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.

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

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No definition available.

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Other Real Estate Owned Proceeds Due from Attorney

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The cash inflow from repayment of equity investment in subsidiary.

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Ths investing cash flow items represents sale of portfolio loans in the period.

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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.

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Transfer of Loans Net to Foreclosed Properties and Repossessions

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