CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 298,515us-gaap_CashAndDueFromBanks	$ 126,072us-gaap_CashAndDueFromBanks
Securities—trading, amortized cost $43,878 and $47,480, respectively	38,074us-gaap_TradingSecurities	40,258us-gaap_TradingSecurities
Securities—available-for-sale, amortized cost $393,831 and $411,424, respectively	395,607us-gaap_AvailableForSaleSecurities	411,021us-gaap_AvailableForSaleSecurities
Securities—held-to-maturity, fair value $140,499 and $137,608, respectively	133,649us-gaap_HeldToMaturitySecurities	131,258us-gaap_HeldToMaturitySecurities
Federal Home Loan Bank (FHLB) stock	25,544us-gaap_FederalHomeLoanBankStock	27,036us-gaap_FederalHomeLoanBankStock
Loans receivable:
Held for sale	9,419us-gaap_LoansHeldForSaleMortgages	2,786us-gaap_LoansHeldForSaleMortgages
Held for portfolio	4,105,399	3,831,034
Allowance for loan losses	(75,365)	(75,907)
Total loans, net	4,039,453us-gaap_LoansReceivableNet	3,757,913us-gaap_LoansReceivableNet
Accrued interest receivable	16,873us-gaap_InterestReceivable	15,279us-gaap_InterestReceivable
Real estate owned (REO), held for sale, net	4,922	3,352
Property and equipment, net	98,728us-gaap_PropertyPlantAndEquipmentNet	91,185us-gaap_PropertyPlantAndEquipmentNet
Goodwill and other intangibles, net	27,258	2,831
Bank-owned life insurance (BOLI)	71,290us-gaap_BankOwnedLifeInsurance	63,759us-gaap_BankOwnedLifeInsurance
Deferred tax assets, net	22,289us-gaap_DeferredTaxAssetsLiabilitiesNet	23,871us-gaap_DeferredTaxAssetsLiabilitiesNet
Income tax receivable	2,462us-gaap_IncomeTaxReceivable	0us-gaap_IncomeTaxReceivable
Other assets	36,708us-gaap_OtherAssets	29,328us-gaap_OtherAssets
Total assets	5,211,372us-gaap_Assets	4,723,163us-gaap_Assets
Deposits:
Non-interest-bearing	1,504,768	1,298,866
Interest-bearing transaction and savings accounts	2,036,600	1,829,568
Interest-bearing certificates	778,049	770,516
Total deposit liabilities	4,319,417us-gaap_Deposits	3,898,950us-gaap_Deposits
Advances from FHLB at fair value	250	32,250
Other borrowings	97,020us-gaap_OtherBorrowings	77,185us-gaap_OtherBorrowings
Junior subordinated debentures at fair value (issued in connection with Trust Preferred Securities)	84,326	78,001
Accrued expenses and other liabilities	38,164	37,082
Deferred compensation	20,882	16,807
Total liabilities	4,560,059us-gaap_Liabilities	4,140,275us-gaap_Liabilities
COMMITMENTS AND CONTINGENCIES (Note 15)
STOCKHOLDERS’ EQUITY
Preferred stock	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Retained earnings	22,623	14,264
Carrying value of shares held in trust for stock related compensation plans	6,950	6,669
Liability for common stock issued to deferred, stock related, compensation plans	6,950	6,669
Accumulated other comprehensive income (loss)	1,137	(258)
Total Stockholders' Equity	651,313us-gaap_StockholdersEquity	582,888us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity	5,211,372	4,723,163
Voting Common Stock [Member]
STOCKHOLDERS’ EQUITY
Common stock	627,553	568,882
Nonvoting Common Stock [Member]
STOCKHOLDERS’ EQUITY
Common stock	$ 0	$ 0

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Value of common stock issued to a trust (for example, but not limited to, rabbi trust) set up specifically to accumulate stock for the sole purpose of distribution to participating employees.

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Amount of par value plus amounts in excess of par value or issuance value for common stock issued.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of interest-bearing domestic certificate of deposit liabilities.

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The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

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Carrying value as of the balance sheet date of obligations, including trade payables, incurred through that date and due within one year (or in the operating cycle if longer) arising from transactions not otherwise specified in the taxonomy.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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For banks, amount of real estate assets held for development or sale, net of associated liabilities.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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The issuance of shares or sale of treasury shares to an Employee Stock Ownership Plan (ESOP).

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