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Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax (benefit) expense	$ 20,000	$ 20,225	$ 16,811
Net income	45,172	44,862	38,827
Unrealized gains (losses) on AFS securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)	(45)	1,155	218
Tax (benefit) expense	(15)	405	76
Net income	$ (30)	$ 750	$ 142

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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-Name Statement of Financial Accounting Standard (FAS)

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The increases or decreases in the market value of unsold securities whose gains or losses were included in earnings, and which, were not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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