Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 39,341us-gaap_NetIncomeLoss	$ 40,783us-gaap_NetIncomeLoss	$ 38,957us-gaap_NetIncomeLoss
Other comprehensive income, net of tax:
Unrealized holding gains (losses) arising during the period	(156)	67	15
Less: reclassification adjustment for (gains) losses included in net income	0	1	(12)
Net unrealized gains (losses) on available-for-sale securities, net of tax	(156)	68	3
Comprehensive income	$ 39,185us-gaap_ComprehensiveIncomeNetOfTax	$ 40,851us-gaap_ComprehensiveIncomeNetOfTax	$ 38,960us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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