Condensed Financial Information (Parent Company Only) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity in net assets of subsidiaries [Abstract]
Loans receivable, net of allowance for loan losses of $8,985 and $8,758, respectively	$ 601,309	$ 589,656
Total assets	787,485	762,079
Subordinated debentures	20,619	24,119
Total Liabilities	699,555	675,623
Stockholders' equity	87,930	86,456	$ 83,810
Total liabilities and stockholders' equity	787,485	762,079
Statements of Operations [Abstract]
Interest income	30,750	31,153
Net interest income	22,189	22,161
Provision for loan losses	(350)	(280)
Income before income tax (benefit) provision	5,526	4,625
Income tax (benefit) expense	(10,014)	90
Net income	15,540	4,535
Cash Flows from Operating Activities [Abstract]
Net income	15,540	4,535
Adjustments to reconcile net income to net cash used in operating activities:
Deferred tax benefit	(10,081)	0
Provision for loan losses	(350)	(280)
Stock-based compensation expense	184	120
Net cash provided by operating activities	7,621	1,153
Cash Flows from Investing Activities [Abstract]
Net cash provided by investing activities	3,376	29,050
Cash Flows from Financing Activities [Abstract]
Repayment of borrowed funds, long term	(18,500)	0
Additional borrowed funds, long-term	3,500	0
Net proceeds from Common Stock issuance	10,510	0
Proceeds from exercise of options	74	96
Net cash provided by (used in) financing activities	12,526	(19,947)
Increase in cash and cash equivalents	23,523	10,256
Cash and cash equivalents at beginning of year	43,591	33,335
Cash and cash equivalents at end of year	67,114	43,591
Series A Preferred Stock [Member]
Cash Flows from Financing Activities [Abstract]
Preferred stock dividends	(210)	0
Series B Preferred Stock [Member]
Cash Flows from Financing Activities [Abstract]
Preferred stock dividends	(7,630)	0
Stock redemption of Series B preferred stock	(23,393)	0
Severn Bancorp, Inc [Member]
Statements of Financial Condition [Abstract]
Cash	2,012	993
Equity in net assets of subsidiaries [Abstract]
Bank	105,898	113,294
Non-Bank	3,014	3,881
Other assets	1,265	912
Total assets	112,189	119,080
Subordinated debentures	20,619	24,119
Other liabilities	3,640	8,505
Total Liabilities	24,259	32,624
Stockholders' equity	87,930	86,456
Total liabilities and stockholders' equity	112,189	119,080
Statements of Operations [Abstract]
Interest income	0	0
Interest expense on subordinated debentures	973	1,322
Net interest income	(973)	(1,322)
General and administrative expenses	229	243
Provision for loan losses	0	0
Income before income tax (benefit) provision	(1,202)	(1,565)
Income tax (benefit) expense	(1,004)	0
Equity in undistributed net income of subsidiaries	15,738	6,100
Net income	15,540	4,535
Cash Flows from Operating Activities [Abstract]
Net income	15,540	4,535
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed earnings of subsidiaries	(15,738)	(6,100)
Deferred tax benefit	(531)	0
Provision for loan losses	0	0
Decrease in other assets	178	8
Stock-based compensation expense	184	120
Increase in other liabilities	(1,965)	1,018
Net cash provided by operating activities	(2,332)	(419)
Cash Flows from Investing Activities [Abstract]
Contributions from subsidiaries	24,000	0
Net cash provided by investing activities	24,000	0
Cash Flows from Financing Activities [Abstract]
Repayment of borrowed funds, long term	(3,500)
Additional borrowed funds, long-term	3,500	0
Stock redemption of Series B preferred stock	(23,393)
Net proceeds from Common Stock issuance	10,510
Proceeds from exercise of options	74	96
Net cash provided by (used in) financing activities	(20,649)	96
Increase in cash and cash equivalents	1,019	(323)
Cash and cash equivalents at beginning of year	993	1,316
Cash and cash equivalents at end of year	2,012	$ 993
Severn Bancorp, Inc [Member] | Series A Preferred Stock [Member]
Cash Flows from Financing Activities [Abstract]
Preferred stock dividends	(210)
Severn Bancorp, Inc [Member] | Series B Preferred Stock [Member]
Cash Flows from Financing Activities [Abstract]
Preferred stock dividends	$ (7,630)