Goodwill and Other Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Summary of core deposit intangibles and other intangibles
Additions during the period		$ 162		$ 1,000
Amortization of other intangible assets	$ 496		$ 539		$ 1,009	$ 1,043
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	4,385				4,385		$ 4,385
Accumulated amortization	(4,385)				(4,385)		(4,273)
Total Estimated Amortization Expense	0				0		112
Amortization of other intangible assets					112		281
Other Intangible Assets
Summary of core deposit intangibles and other intangibles
Gross carrying amount	32,572				32,572		32,410
Accumulated amortization	(18,042)				(18,042)		(17,145)
Total Estimated Amortization Expense	$ 14,530				14,530		15,265
Additions during the period					162		1,012
Amortization of other intangible assets					$ 897		$ 1,812