Loans (Schedule of Loans Individually Evaluated for Impairment) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 37,375	$ 37,805
Unpaid Principal Balance	37,391	37,824
Related Allowance	868	1,590
Average Impaired Balance	36,595	35,646
Interest Income Recognized while impaired	1,570	2,232
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	318	243
Without a related allowance, Unpaid Principal Balance	318	243
Without a related allowance, Average Impaired Balance	220	259
Without a related allowance, Interest Income Recognized while impaired	10	13
With a related allowance, Recorded Investment	0	252
With a related allowance, Unpaid Principal Balance	0	252
With a related allowance, Related Allowance	0	252
With a related allowance, Average Impaired Balance	0	262
With a related allowance, Interest Income Recognized while impaired	0	0
Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	2,718	7,109
Without a related allowance, Unpaid Principal Balance	2,719	7,111
Without a related allowance, Average Impaired Balance	2,719	5,149
Without a related allowance, Interest Income Recognized while impaired	130	265
With a related allowance, Recorded Investment	6,756	2,436
With a related allowance, Unpaid Principal Balance	6,756	2,436
With a related allowance, Related Allowance	124	125
With a related allowance, Average Impaired Balance	6,756	2,451
With a related allowance, Interest Income Recognized while impaired	274	161
Non-Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	9,752	9,105
Without a related allowance, Unpaid Principal Balance	9,757	9,106
Without a related allowance, Average Impaired Balance	9,757	9,736
Without a related allowance, Interest Income Recognized while impaired	491	684
With a related allowance, Recorded Investment	329	1,338
With a related allowance, Unpaid Principal Balance	331	1,344
With a related allowance, Related Allowance	24	517
With a related allowance, Average Impaired Balance	331	676
With a related allowance, Interest Income Recognized while impaired	23	43
Land and Land Improvements [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	5,017	5,018
Without a related allowance, Unpaid Principal Balance	5,017	5,018
Without a related allowance, Average Impaired Balance	5,017	4,743
Without a related allowance, Interest Income Recognized while impaired	104	329
With a related allowance, Recorded Investment	1,455	1,464
With a related allowance, Unpaid Principal Balance	1,456	1,464
With a related allowance, Related Allowance	515	524
With a related allowance, Average Impaired Balance	1,456	1,477
With a related allowance, Interest Income Recognized while impaired	54	74
Construction [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	0	0
Without a related allowance, Unpaid Principal Balance	0	0
Without a related allowance, Average Impaired Balance	0	0
Without a related allowance, Interest Income Recognized while impaired	0	0
With a related allowance, Recorded Investment	0	0
With a related allowance, Unpaid Principal Balance	0	0
With a related allowance, Related Allowance	0	0
With a related allowance, Average Impaired Balance	0	0
With a related allowance, Interest Income Recognized while impaired	0	0
Non-Jumbo [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	4,266	4,190
Without a related allowance, Unpaid Principal Balance	4,273	4,199
Without a related allowance, Average Impaired Balance	3,575	4,214
Without a related allowance, Interest Income Recognized while impaired	166	240
With a related allowance, Recorded Investment	1,872	1,717
With a related allowance, Unpaid Principal Balance	1,873	1,718
With a related allowance, Related Allowance	192	158
With a related allowance, Average Impaired Balance	1,873	1,691
With a related allowance, Interest Income Recognized while impaired	73	100
Jumbo [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	3,520	3,555
Without a related allowance, Unpaid Principal Balance	3,519	3,554
Without a related allowance, Average Impaired Balance	3,519	3,592
Without a related allowance, Interest Income Recognized while impaired	167	228
With a related allowance, Recorded Investment	834	838
With a related allowance, Unpaid Principal Balance	834	839
With a related allowance, Related Allowance	13	14
With a related allowance, Average Impaired Balance	834	845
With a related allowance, Interest Income Recognized while impaired	49	57
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	523	523
Without a related allowance, Unpaid Principal Balance	523	523
Without a related allowance, Average Impaired Balance	523	523
Without a related allowance, Interest Income Recognized while impaired	27	35
With a related allowance, Recorded Investment	0	0
With a related allowance, Unpaid Principal Balance	0	0
With a related allowance, Related Allowance	0	0
With a related allowance, Average Impaired Balance	0	0
With a related allowance, Interest Income Recognized while impaired	0	0
Mortgage Warehouse Lines [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	0	0
Without a related allowance, Unpaid Principal Balance	0	0
Without a related allowance, Average Impaired Balance	0	0
Without a related allowance, Interest Income Recognized while impaired	0	0
With a related allowance, Recorded Investment	0	0
With a related allowance, Unpaid Principal Balance	0	0
With a related allowance, Related Allowance	0	0
With a related allowance, Average Impaired Balance	0	0
With a related allowance, Interest Income Recognized while impaired	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	15	17
Without a related allowance, Unpaid Principal Balance	15	17
Without a related allowance, Average Impaired Balance	15	28
Without a related allowance, Interest Income Recognized while impaired	2	3
With a related allowance, Recorded Investment	0	0
With a related allowance, Unpaid Principal Balance	0	0
With a related allowance, Related Allowance	0	0
With a related allowance, Average Impaired Balance	0	0
With a related allowance, Interest Income Recognized while impaired	0	0
Total Without a Related Allowance
Financing Receivable, Impaired [Line Items]
Without a related allowance, Recorded Investment	26,129	29,760
Without a related allowance, Unpaid Principal Balance	26,141	29,771
Without a related allowance, Average Impaired Balance	25,345	28,244
Without a related allowance, Interest Income Recognized while impaired	1,097	1,797
Total With a Related Allowance
Financing Receivable, Impaired [Line Items]
With a related allowance, Recorded Investment	11,246	8,045
With a related allowance, Unpaid Principal Balance	11,250	8,053
With a related allowance, Related Allowance	868	1,590
With a related allowance, Average Impaired Balance	11,250	7,402
With a related allowance, Interest Income Recognized while impaired	473	435
Total Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment	26,345	26,965
Unpaid Principal Balance	26,354	26,974
Related Allowance	663	1,418
Average Impaired Balance	26,256	24,753
Interest Income Recognized while impaired	1,086	1,569
Total Residential Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,015	10,823
Unpaid Principal Balance	11,022	10,833
Related Allowance	205	172
Average Impaired Balance	10,324	10,865
Interest Income Recognized while impaired	482	660
Total Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	15	17
Unpaid Principal Balance	15	17
Related Allowance	0	0
Average Impaired Balance	15	28
Interest Income Recognized while impaired	$ 2	$ 3