CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 43,089us-gaap_CashAndDueFromBanks	$ 54,179us-gaap_CashAndDueFromBanks
Short-term investments	19,125us-gaap_CashEquivalentsAtCarryingValue	17,575us-gaap_CashEquivalentsAtCarryingValue
Total cash and cash equivalents	62,214	71,754
Trading security	14,970us-gaap_TradingSecurities	14,909us-gaap_TradingSecurities
Securities available for sale, at fair value	1,099,656us-gaap_AvailableForSaleSecurities	1,091,818us-gaap_AvailableForSaleSecurities
Securities held to maturity (fair values of $44,744 and $44,997)	42,818us-gaap_HeldToMaturitySecurities	43,347us-gaap_HeldToMaturitySecurities
Federal Home Loan Bank stock and other restricted securities	58,734	55,720
Total securities	1,216,178us-gaap_Investments	1,205,794us-gaap_Investments
Loans held for sale, at fair value	29,305	19,493
Residential mortgages	1,473,239	1,496,204
Commercial real estate	1,672,099	1,611,567
Commercial and industrial loans	826,815	804,366
Consumer loans	756,510	768,463
Total loans	4,728,663	4,680,600
Less: Allowance for loan losses	36,286	35,662
Net loans	4,692,377	4,644,938
Premises and equipment, net	85,053us-gaap_PropertyPlantAndEquipmentNet	87,279us-gaap_PropertyPlantAndEquipmentNet
Other real estate owned	1,444	2,049
Goodwill	264,742us-gaap_Goodwill	264,742us-gaap_Goodwill
Other intangible assets	10,627	11,528
Cash surrender value of bank-owned life insurance policies	105,302us-gaap_BankOwnedLifeInsurance	104,588us-gaap_BankOwnedLifeInsurance
Deferred tax assets, net	26,828us-gaap_DeferredTaxAssetsLiabilitiesNet	28,776us-gaap_DeferredTaxAssetsLiabilitiesNet
Other assets	77,169us-gaap_OtherAssets	61,090us-gaap_OtherAssets
Total assets	6,571,239us-gaap_Assets	6,502,031us-gaap_Assets
Liabilities
Demand deposits	892,225us-gaap_DemandDepositAccounts	869,302us-gaap_DemandDepositAccounts
NOW deposits	436,458	426,108
Money market deposits	1,372,924us-gaap_DepositsMoneyMarketDeposits	1,407,179us-gaap_DepositsMoneyMarketDeposits
Savings deposits	512,607us-gaap_DepositsSavingsDeposits	496,344us-gaap_DepositsSavingsDeposits
Time deposits	1,505,469us-gaap_TimeDeposits	1,455,746us-gaap_TimeDeposits
Total deposits	4,719,683us-gaap_Deposits	4,654,679us-gaap_Deposits
Short-term debt	894,500us-gaap_ShortTermBorrowings	900,900us-gaap_ShortTermBorrowings
Long-term Federal Home Loan Bank advances	61,618	61,676
Subordinated notes	89,765us-gaap_JuniorSubordinatedNotes	89,747us-gaap_JuniorSubordinatedNotes
Total borrowings	1,045,883us-gaap_DebtAndCapitalLeaseObligations	1,052,323us-gaap_DebtAndCapitalLeaseObligations
Other liabilities	89,443us-gaap_OtherLiabilities	85,742us-gaap_OtherLiabilities
Total liabilities	5,855,009us-gaap_Liabilities	5,792,744us-gaap_Liabilities
Stockholders' equity
Common stock ($.01 par value; 50,000,000 shares authorized and 26,525,466 shares issued and 25,252,635 shares outstanding in 2015; 26,525,466 shares issued and 25,182,566 shares outstanding in 2014)	265us-gaap_CommonStockValue	265us-gaap_CommonStockValue
Additional paid-in capital	585,307	587,289
Unearned compensation	(7,226)us-gaap_DeferredCompensationEquity	(6,147)us-gaap_DeferredCompensationEquity
Retained earnings	160,241	156,446
Accumulated other comprehensive loss	9,068	6,579
Treasury stock, at cost (1,272,831 shares in 2015 and 1,342,900 shares in 2014)	(31,425)us-gaap_TreasuryStockValue	(33,145)us-gaap_TreasuryStockValue
Total stockholders' equity	716,230us-gaap_StockholdersEquity	709,287us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 6,571,239	$ 6,502,031

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Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans not part of a disposal group or discontinued operation.

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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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