Intangible Assets (Amortization Expense of Core Deposit Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets
Carrying amount	$ 12,872	$ 14,902	$ 13,424
Amortization of intangible assets	695	1,001
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
Accumulated amortization	9,103	7,242	8,658
Carrying amount	9,556	11,417	10,001
Amortization of intangible assets	$ 445	$ 493