Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Summary of core deposit intangibles and other intangibles
Additions during the period	$ 162	$ 1,000
Amortization of other intangible assets	513	$ 504
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	4,385		$ 4,385
Accumulated amortization	(4,340)		(4,273)
Total Estimated Amortization Expense	45		112
Amortization of other intangible assets	67		281
Other Intangible Assets
Summary of core deposit intangibles and other intangibles
Gross carrying amount	32,572		32,410
Accumulated amortization	(17,591)		(17,145)
Total Estimated Amortization Expense	14,981		15,265
Additions during the period	162		1,012
Amortization of other intangible assets	$ 446		$ 1,812