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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 16,865 us-gaap_NetIncomeLoss | $ 13,479 us-gaap_NetIncomeLoss | $ 12,773 us-gaap_NetIncomeLoss | $ 10,549 us-gaap_NetIncomeLoss | $ 17,443 us-gaap_NetIncomeLoss | $ 9,699 us-gaap_NetIncomeLoss | $ 7,644 us-gaap_NetIncomeLoss | $ 8,851 us-gaap_NetIncomeLoss | $ 53,666 us-gaap_NetIncomeLoss | $ 43,637 us-gaap_NetIncomeLoss | $ 29,353 us-gaap_NetIncomeLoss
Other comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on securities, net of tax |  |  |  |  |  |  |  |  | 7,105 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (7,274)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 764 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income | $ 17,597 us-gaap_ComprehensiveIncomeNetOfTax | $ 13,596 us-gaap_ComprehensiveIncomeNetOfTax | $ 15,789 us-gaap_ComprehensiveIncomeNetOfTax | $ 13,789 us-gaap_ComprehensiveIncomeNetOfTax | $ 15,819 us-gaap_ComprehensiveIncomeNetOfTax | $ 8,654 us-gaap_ComprehensiveIncomeNetOfTax | $ 3,584 us-gaap_ComprehensiveIncomeNetOfTax | $ 8,306 us-gaap_ComprehensiveIncomeNetOfTax | $ 60,771 us-gaap_ComprehensiveIncomeNetOfTax | $ 36,363 us-gaap_ComprehensiveIncomeNetOfTax | $ 30,117 us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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