Acquisition (Noninterest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Labor and Related Expense													$ 19,302	$ 17,773	$ 15,377
Occupancy, Net													3,283	2,506	1,984
Professional Fees													1,538	1,809	1,979
Information Technology and Data Processing													1,392	1,457	911
Marketing Expense													344	270	194
Other General and Administrative Expense													2,650	2,171	1,441
Noninterest Expense	$ 7,746	$ 7,201	$ 7,487	$ 7,027	$ 7,069	$ 6,836	$ 6,836	$ 6,068	$ 5,850	$ 5,254	$ 6,072	$ 5,773	$ 29,461	$ 26,809	$ 22,949