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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income/(Loss) [Member]
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 | $ 714,814 us-gaap_StockholdersEquity | $ 479,973 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 193,372 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 41,469 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning balance, shares at Dec. 31, 2011 |  | 104,482 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock | (54)us-gaap_StockRepurchasedDuringPeriodValue | (54)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock, shares |  | (5)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Exercise of stock options | 2,557 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 2,557 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Exercise of stock options, shares |  | 292 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Tax benefit from exercise of stock options | 194 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 194 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares issued pursuant to stock-based compensation plan | 2,039 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 2,039 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares issued pursuant to stock-based compensation plan, shares |  | 121 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends declared | (35,642)us-gaap_DividendsCommonStockCash |  | (35,642)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net earnings | 77,280 us-gaap_NetIncomeLoss |  | 77,280 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss), net of tax | 1,782 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  | 1,782 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance at Dec. 31, 2012 | 762,970 us-gaap_StockholdersEquity | 484,709 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 235,010 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 43,251 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Dec. 31, 2012 |  | 104,890 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock | (559)us-gaap_StockRepurchasedDuringPeriodValue | (559)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock, shares |  | (42)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Exercise of stock options | 4,517 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 4,517 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Exercise of stock options, shares |  | 428 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Tax benefit from exercise of stock options | 475 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 475 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares issued pursuant to stock-based compensation plan | 1,926 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 1,926 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares issued pursuant to stock-based compensation plan, shares |  | 94 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends declared | (40,469)us-gaap_DividendsCommonStockCash |  | (40,469)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net earnings | 95,608 us-gaap_NetIncomeLoss |  | 95,608 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss), net of tax | (52,581)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  | (52,581)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance at Dec. 31, 2013 | 771,887 us-gaap_StockholdersEquity | 491,068 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 290,149 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (9,330)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Dec. 31, 2013 |  | 105,370 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock | (5,474)us-gaap_StockRepurchasedDuringPeriodValue | (5,474)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock, shares |  | (384)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Exercise of stock options | 5,522 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 5,522 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Exercise of stock options, shares | 512 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 512 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Tax benefit from exercise of stock options | 1,116 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 1,116 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares issued pursuant to stock-based compensation plan | 2,988 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 2,988 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares issued pursuant to stock-based compensation plan, shares |  | 395 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends declared | (42,356)us-gaap_DividendsCommonStockCash |  | (42,356)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net earnings | 104,021 us-gaap_NetIncomeLoss |  | 104,021 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss), net of tax | 40,405 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  | 40,405 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance at Dec. 31, 2014 | $ 878,109 us-gaap_StockholdersEquity | $ 495,220 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 351,814 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 31,075 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Dec. 31, 2014 |  | 105,893 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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