Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition, Pro Forma Information [Abstract]
Net Interest Income	$ 168,693	$ 157,194
Provision for Loan Losses	2,276	3,706
Net Interest Income after Provision for Loan Losses	166,417	153,488
Non-interest Income	43,472	39,918
Non-interest Expense	134,446	124,944
Income before Income Taxes	75,443	68,462
Income Tax Expense	13,246	10,216
Net Income	$ 62,197	$ 58,246
Basic Earnings Per Share (in USD per share)	$ 1.43	$ 1.52
Diluted Earnings Per Share (in USD per share)	$ 1.43	$ 1.51