Loans and Allowance for Loan Losses (Impaired Loans) (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired loans, no individually reviewed for impairment		$ 4,967,000		$ 4,612,000
Impaired loans, individually reviewed, with no impairment		26,631,000		39,866,000
Impaired loans, individually reviewed, with impairment		7,851,000		2,965,000
Total impaired loans, excluding purchased impaired		39,449,000	[1]	47,443,000	[1]
Purchased impaired loans with subsequent deterioration		118,701,000		161,307,000
Purchased impaired loans with no subsequent deterioration		4,141,000		344,000
Impaired loan, individually reviewed, with impairment, associated reserves		418,000	[1]	927,000	[1]
Purchased impaired loans with subsequent deterioration, associated reserves		3,237,000		5,560,000
Impaired financing receivable, including deteriorated loans purchased, related allowance		3,655,000		6,487,000
Imparied financing receivable, simple average balance	43,446,000	65,527,000
Restructured loans		19,400,000		18,100,000
Performing [Member]
Financing Receivable, Impaired [Line Items]
Restructured loans		$ 14,100,000		$ 12,100,000

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