Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 3,094	$ 3,747	$ 4,043
Core Deposit Intangibles [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	19,545	36,230	36,230
Accumulated amortization	(19,152)	(34,433)	(31,565)
Total Estimated Amortization Expense	393	1,797	4,665
Amortization of other intangible assets	1,404	2,868	3,122
Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	31,398	19,283	19,283
Accumulated amortization	(15,333)	(13,643)	(12,764)
Total Estimated Amortization Expense	16,065	5,640	6,519
Additions during the period	12,115	0	0
Amortization of other intangible assets	$ 1,690	$ 879	$ 921