Intangible Assets (Amortization Expense of Core Deposit Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets
Carrying amount	$ 11,958	$ 13,865	$ 11,958	$ 13,865	$ 13,424
Amortization of intangible assets			2,211	2,794
Core deposit intangible assets [Member]
Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets
Gross original amount	18,659	18,659	18,659	18,659	18,659
Accumulated amortization	9,994	8,193	9,994	8,193	8,658
Carrying amount	8,665	10,466	8,665	10,466	10,001
Amortization of intangible assets	$ 445	$ 467	$ 1,336	$ 1,444