Loans and Allowance for Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2016	Dec. 31, 2015
Recorded Investment
Impaired loans, no individually reviewed for impairment		$ 4,543	$ 4,903
Impaired loans, individually reviewed, with no impairment		18,383	22,411
Impaired loans, individually reviewed, with impairment		3,731	3,817
Total impaired loans, excluding purchased impaired	[1]	26,657	31,131
Purchased impaired loans with subsequent deterioration		69,587	84,329
Purchased impaired loans with no subsequent deterioration		3,011	3,235
Impaired financing receivable, simple average balance		28,894	35,290
Associated Reserves
Impaired loan, individually reviewed, with impairment, associated reserves	[1]	328	399
Purchased impaired loans with subsequent deterioration		2,754	2,754
Impaired financing receivable, including deteriorated loans purchased, related allowance		3,082	3,153
Restructured and performing loans		$ 12,000	$ 13,100

[1] * Included at June 30, 2016 and December 31, 2015 were $12.0 million and $13.1 million, respectively, in restructured and performing loans.