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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Additional Paid In Capital Preferred Stock | Common Stock | Additional Paid In Capital Common Stock | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2011 | $ 83,027 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember | $ 157 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,443,883 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 934,617 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (116,001)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (33,940)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 2,311,743 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  | 281,650 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 281,650 us-gaap_NetIncomeLoss
Other comprehensive income (loss) |  |  |  |  |  | 38,609 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 38,609 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock compensation costs |  |  | 12,668 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 12,668 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Tax benefit from stock compensation plans, net |  |  | 462 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 462 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Issuance of 655,301, 323,737 and 336,031 shares of common stock pursuant to various stock compensation plans and agreements for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 3,821 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,821 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of 18,909, 19,998 and 26,151 shares pursuant to Director retainer fee for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 570 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 570 us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Cancellation of 20,017, 65,686 and 190,634 shares of common stock due to forfeitures of issued restricted stock for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 3,335 us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (3,335)us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
285,953, 508,518 and 137,258 shares of restricted stock surrendered due to employee tax liability for the year ended December 31, 2014, 2013 and 2012 respectively |  |  |  |  | (3,012)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (3,012)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Preferred stock dividends |  |  |  | (6,857)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (6,857)us-gaap_DividendsPreferredStock
Common stock dividends |  |  |  | (57,582)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (57,582)us-gaap_DividendsCommonStock
Purchase of 8,026,807 and 9,068,105 shares of treasury stock pursuant to the Stock Repurchase Program for year ended December 31, 2013 and 2012 respectively |  |  |  |  | (199,950)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (199,950)us-gaap_TreasuryStockValueAcquiredCostMethod
BALANCE at Dec. 31, 2012 | 83,027 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember | 157 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,464,739 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,151,828 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (322,298)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 4,669 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,382,122 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  | 295,045 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 295,045 us-gaap_NetIncomeLoss
Other comprehensive income (loss) |  |  |  |  |  | (35,128)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (35,128)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock compensation costs |  |  | 13,548 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 13,548 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Tax benefit from stock compensation plans, net |  |  | 5,522 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 5,522 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Issuance of 655,301, 323,737 and 336,031 shares of common stock pursuant to various stock compensation plans and agreements for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 3,054 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,054 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of 18,909, 19,998 and 26,151 shares pursuant to Director retainer fee for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 630 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 630 us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Cancellation of 20,017, 65,686 and 190,634 shares of common stock due to forfeitures of issued restricted stock for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 1,156 us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (1,156)us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
285,953, 508,518 and 137,258 shares of restricted stock surrendered due to employee tax liability for the year ended December 31, 2014, 2013 and 2012 respectively |  |  |  |  | (13,833)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (13,833)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Preferred stock dividends |  |  |  | (3,428)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (3,428)us-gaap_DividendsPreferredStock
Common stock dividends |  |  |  | (83,315)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (83,315)us-gaap_DividendsCommonStock
Conversion of 85,710 shares of Series A preferred stock into 5,594,080 shares of common stock | (83,027)us-gaap_ConversionOfStockAmountIssued1 / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember | 6 us-gaap_ConversionOfStockAmountIssued1 / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 83,021 us-gaap_ConversionOfStockAmountIssued1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Purchase of 8,026,807 and 9,068,105 shares of treasury stock pursuant to the Stock Repurchase Program for year ended December 31, 2013 and 2012 respectively |  |  |  |  | (199,992)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (199,992)us-gaap_TreasuryStockValueAcquiredCostMethod
BALANCE at Dec. 31, 2013 |  | 163 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,571,670 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,360,130 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (537,279)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (30,459)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,364,225 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  | 342,483 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 342,483 us-gaap_NetIncomeLoss
Other comprehensive income (loss) |  |  |  |  |  | 34,696 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 34,696 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock compensation costs |  |  | 13,883 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 13,883 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Tax benefit from stock compensation plans, net |  |  | 6,513 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 6,513 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Issuance of 655,301, 323,737 and 336,031 shares of common stock pursuant to various stock compensation plans and agreements for the year ended December 31, 2014, 2013 and 2012 respectively |  | 1 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,793 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 6,794 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of 18,909, 19,998 and 26,151 shares pursuant to Director retainer fee for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 630 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 630 us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Cancellation of 20,017, 65,686 and 190,634 shares of common stock due to forfeitures of issued restricted stock for the year ended December 31, 2014, 2013 and 2012 respectively |  |  | 379 us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (379)us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
285,953, 508,518 and 137,258 shares of restricted stock surrendered due to employee tax liability for the year ended December 31, 2014, 2013 and 2012 respectively |  |  |  |  | (10,326)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (10,326)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Common stock dividends |  |  |  | (104,015)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (104,015)us-gaap_DividendsCommonStock
Issuance of 5,583,093 shares pursuant to MetroCorp acquisition |  |  | 73,044 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 117,786 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | 190,830 us-gaap_StockIssuedDuringPeriodValueAcquisitions
Warrant acquired pursuant to MetroCorp acquisition |  |  | 4,855 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 4,855 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
BALANCE at Dec. 31, 2014 |  | $ 164 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,677,767 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,598,598 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (430,198)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 4,237 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 2,850,568 us-gaap_StockholdersEquity

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