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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Common Stock | Additional Paid In Capital Common Stock | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Income (Loss), Net of Tax | Total
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2013 | [1] | $ 163 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,571,670 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,362,278 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 | $ 2,366,373 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income | [1] |  |  | 74,171 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 74,171 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  |  |  | 13,422 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 13,422 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock compensation costs |  |  | 3,180 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,180 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Tax benefit from stock compensation plans, net |  |  | 3,708 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,708 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Issuance of 379,191 and 356,187 shares of common stock pursuant to various stock compensation plans and agreements for the period ended March 31, 2015 and 2014, respectively |  |  | 283 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 283 us-gaap_StockIssuedDuringPeriodValueNewIssues
Cancellation of 7,233 shares of common stock due to forfeitures of issued restricted stock for the period ended March 31, 2014 |  |  | 127 us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (127)us-gaap_RestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
140,871 and 195,291 shares of restricted stock surrendered due to employee tax liability for the period ended March 31, 2015 and 2014, respectively |  |  |  |  | (7,074)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (7,074)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Common stock dividends |  |  |  | (25,950)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (25,950)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 Mar. 31, 2014 | [1] | 163 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,656,867 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,410,499 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (426,694)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (17,037)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,623,798 us-gaap_StockholdersEquity
BALANCE at Dec. 31, 2014 | [1] | 164 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,677,767 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,604,141 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 | 2,856,111 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  | 100,027 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 100,027 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  |  |  | 9,318 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 9,318 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock compensation costs |  |  | 3,954 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,954 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Tax benefit from stock compensation plans, net |  |  | 3,145 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,145 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Issuance of 379,191 and 356,187 shares of common stock pursuant to various stock compensation plans and agreements for the period ended March 31, 2015 and 2014, respectively |  |  | 833 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 833 us-gaap_StockIssuedDuringPeriodValueNewIssues
140,871 and 195,291 shares of restricted stock surrendered due to employee tax liability for the period ended March 31, 2015 and 2014, respectively |  |  |  |  | (5,691)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (5,691)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Common stock dividends |  |  |  | (28,934)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (28,934)us-gaap_DividendsCommonStock
BALANCE at Mar. 31, 2015 |  | $ 164 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,685,699 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,675,234 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (435,889)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 13,555 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 2,938,763 us-gaap_StockholdersEquity
[1] | Prior periods were restated to reflect the retrospective application of adopting the new accounting guidance related to the Company?s investments in qualified affordable housing projects Accounting Standard Update ("ASU") 2014-01. See Note 10 of the Notes to Consolidated Financial Statements for additional information.

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