Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Summary of core deposit intangibles and other intangibles
Additions during the period		$ 1,000				$ 12,000
Amortization of other intangible assets	$ 539		$ 888	$ 1,043	$ 1,689
Core Deposit Intangibles [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	4,385			4,385		19,545
Accumulated amortization	(4,132)			(4,132)		(19,152)
Total Estimated Amortization Expense	253			253		393
Amortization of other intangible assets				140		1,404
Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	32,410			32,410		31,398
Accumulated amortization	(16,236)			(16,236)		(15,333)
Total Estimated Amortization Expense	$ 16,174			16,174		16,065
Additions during the period				1,012		12,115
Amortization of other intangible assets				$ 903		$ 1,690