Recent Accounting Pronouncements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Noninterest expense reduction	$ (10,096)	$ (9,577)	$ (20,250)	$ (19,326)
Income tax expense increase	1,003	1,323	2,080	2,610
Efective tax rate	17.00%	21.00%	17.00%	21.00%
Accounting Standards Update 2014-01 [Member] | Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Noninterest expense reduction	$ 327	$ 270	$ 654	$ 540
Accounting Standards Update 2014-01 [Member] | Scenario, Actual [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Efective tax rate	23.00%	25.00%	23.00%	26.00%