Loans and Allowance for Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014
Balance
Impaired loans, not individually reviewed for impairment			$ 4,903	$ 4,967
Impaired loans, individually reviewed, with no reserves			22,411	26,631
Impaired loans, individually reviewed, with reserves			3,817	7,851
Total impaired loans, excluding purchased impaired	[1]		31,131	39,449
Purchased impaired loans with subsequent deterioration			84,329	118,701
Purchased impaired loans with no subsequent deterioration			3,235	4,141
Average impaired loans, excluding purchased impaired, calculated using a simple average		$ 35,290	43,446
Associated Reserves
Total impaired loans, excluding purchased impaired	[1]		399	418
Purchased impaired loans with subsequent deterioration			2,754	3,237
Total Reserves			3,153	3,655
Restructured and performing loans			17,900	19,400
Performing [Member]
Associated Reserves
Restructured and performing loans			$ 13,100	$ 14,100

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