Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Business Acquisition, Pro Forma Information [Abstract]
Net Interest Income	$ 43,463	$ 127,174
Provision for Loan Losses	376	1,936
Net Interest Income after Provision for Loan Losses	43,087	125,238
Non-interest Income	11,514	31,538
Non-interest Expense	30,060	103,796
Income before Income Taxes	24,541	52,980
Income Tax Expense	4,004	9,326
Net Income	20,537	43,654
Net Income Available to Common Shareholders	$ 20,537	$ 43,654
Basic Earnings Per Share (in USD per share)	$ 0.46	$ 0.97
Diluted Earnings Per Share (in USD per share)	$ 0.46	$ 0.97