Loans and Allowance for Loan Losses (Impaired Loans) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired loans, no individually reviewed for impairment	$ 4,670,000		$ 4,612,000
Impaired loans, individually reviewed, with no impairment	33,317,000		39,865,000
Impaired loans, individually reviewed, with impairment	8,112,000		2,965,000
Total impaired loans, excluding purchased impaired	46,099,000	[1]	47,442,000	[1]
Purchased impaired loans with subsequent deterioration	138,789,000		161,307,000
Purchased impaired loans with no subsequent deterioration	10,244,000		344,000
Impaired loan, individually reviewed, with impairment, associated reserves	1,119,000	[1]	927,000	[1]
Purchased impaired loans with subsequent deterioration, associated reserves	5,237,000		5,560,000
Impaired financing receivable, including deteriorated loans purchased, related allowance	6,356,000		6,487,000
Impaired financing receivable, simple average balance	46,771,000		65,527,000
Restructured loans	18,100,000		18,100,000
Performing [Member]
Financing Receivable, Impaired [Line Items]
Restructured loans	$ 12,500,000		$ 12,100,000

[1] * Included at March 31, 2014 and December 31, 2013 were $12.5 million and $12.1 million, respectively, in restructured and performing loans.