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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Principle - Consolidated Statements of Operations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest and dividend income	$ 60,780us-gaap_InterestAndDividendIncomeOperating	$ 42,776us-gaap_InterestAndDividendIncomeOperating
Interest expense	8,783us-gaap_InterestExpense	7,591us-gaap_InterestExpense
Net interest income	51,997us-gaap_InterestIncomeExpenseNet	35,185us-gaap_InterestIncomeExpenseNet
Provision for loan and lease losses	0us-gaap_ProvisionForLoanAndLeaseLosses	1,929us-gaap_ProvisionForLoanAndLeaseLosses
Noninterest income	45,980us-gaap_NoninterestIncome	25,278us-gaap_NoninterestIncome
Noninterest expense	75,879us-gaap_NoninterestExpense	57,594us-gaap_NoninterestExpense
Income before income taxes	22,098us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	940us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense	9,524us-gaap_IncomeTaxExpenseBenefit	191us-gaap_IncomeTaxExpenseBenefit
Net income	12,574us-gaap_NetIncomeLoss	749us-gaap_NetIncomeLoss
Preferred stock dividends	910us-gaap_PreferredStockDividendsIncomeStatementImpact	910us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income (loss) available to common stockholders	11,664us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(161)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per common share (in usd per share)	$ 0.30us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in usd per share)	$ 0.29us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest and dividend income		42,776us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Interest expense		7,591us-gaap_InterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net interest income		35,185us-gaap_InterestIncomeExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Provision for loan and lease losses		1,929us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Noninterest income		25,278us-gaap_NoninterestIncome / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Noninterest expense		57,768us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income before income taxes		766us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income tax expense		9us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net income		757us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Preferred stock dividends		910us-gaap_PreferredStockDividendsIncomeStatementImpact / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net income (loss) available to common stockholders		(153)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Basic earnings per common share (in usd per share)		$ (0.01)us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Diluted earnings per common share (in usd per share)		$ (0.01)us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Effect of Change in Accounting Principle
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
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Provision for loan and lease losses		0us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Noninterest income		0us-gaap_NoninterestIncome / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Noninterest expense		(174)us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Income before income taxes		174us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Income tax expense		182us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net income		(8)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Preferred stock dividends		0us-gaap_PreferredStockDividendsIncomeStatementImpact / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net income (loss) available to common stockholders		$ (8)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Basic earnings per common share (in usd per share)		$ 0.00us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Diluted earnings per common share (in usd per share)		$ 0.00us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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