Other Intangibles - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 85,869	$ 63,940
Accumulated amortization	(61,440)	(54,721)
Core Deposit and Other Intangibles	24,429	31,148
Core deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Intangibles acquired		18,164
Other intangible
Acquired Finite-Lived Intangible Assets [Line Items]
Intangibles acquired		$ 3,765