Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Business Acquisition, Pro Forma Information [Abstract]
Net Interest Income	$ 41,529	$ 83,711
Provision for Loan Losses	896	1,560
Net Interest Income after Provision for Loan Losses	40,633	82,151
Non-interest Income	10,898	20,024
Non-interest Expense	31,584	73,736
Income before Income Taxes	19,947	28,439
Income Tax Expense	3,305	5,322
Net Income	16,642	23,117
Net Income Available to Common Shareholders	$ 16,642	$ 23,117
Basic Earnings Per Share (in USD per share)	$ 0.37	$ 0.51
Diluted Earnings Per Share (in USD per share)	$ 0.37	$ 0.51