Parent Company Financial Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity in net assets of subsidiaries [Abstract]
Other assets	$ 5,214	$ 2,644
Total assets	826,919	974,233
Liabilities [Abstract]
Subordinated debentures	20,619	20,619
Total liabilities	721,447	875,780
Stockholders' Equity	105,472	98,453	$ 91,100
Total liabilities and stockholders' equity	826,919	974,233
Statements of Income [Abstract]
Interest income	39,810	37,660
Net interest expense	30,507	29,057
Loss before income taxes and equity in undistributed net income of subsidiaries	11,610	11,546
Income tax benefit	(3,236)	(2,977)
Net income	8,374	8,569
Other comprehensive income (loss) item - unrealized holding gains (losses) on AFS securities arising during the period (net of tax (expense) benefit of $(10) and $14)	28	(38)
Unrealized holding losses on available-for-sale securities arising during the period, income taxes	(10)	14
Total comprehensive income	8,402	8,531
Cash flows from operating activities:
Net income and comprehensive income	8,374	8,569
Adjustments to reconcile net income to net cash from operating activities [Abstract]
Stock-based compensation	146	218
Deferred income taxes	604	2,952
(Increase) decrease in other assets	(32)	132
Net cash provided by operating activities	6,790	5,717
Cash flows from investing activities [Abstract]
Net cash provided by (used in) investing activities	51,549	(301)
Cash flows from financing activities [Abstract]
Repayments of long-term borrowings	(38,500)	(61,500)
Preferred stock dividends		(70)
Common stock dividends	(1,789)	(1,511)
Net cash (used in) provided by financing activities	(158,486)	161,071
(Decrease) increase in cash and cash equivalents	(100,147)	166,487
Cash and cash equivalents at beginning of period	188,340	21,853
Cash and cash equivalents at end of period	88,193	188,340
Severn Bancorp, Inc [Member]
Assets [Abstract]
Cash	1,481	1,378
Equity in net assets of subsidiaries [Abstract]
Bank	118,712	115,799
Nonbank	4,516	4,152
Other assets	1,505	1,431
Total assets	126,214	122,760
Liabilities [Abstract]
Subordinated debentures	20,619	20,619
Other liabilities	123	3,688
Total liabilities	20,742	24,307
Stockholders' Equity	105,472	98,453
Total liabilities and stockholders' equity	126,214	122,760
Statements of Income [Abstract]
Interest income		1
Interest expense on subordinated debentures	1,066	1,006
Net interest expense	(1,066)	(1,005)
Dividend from subsidiary	6,340	2,215
General and administrative expenses	(235)	(167)
Loss before income taxes and equity in undistributed net income of subsidiaries	5,039	1,043
Income tax benefit	87	159
Equity in undistributed net income of subsidiaries	3,248	7,367
Net income	8,374	8,569
Other comprehensive income (loss) item - unrealized holding gains (losses) on AFS securities arising during the period (net of tax (expense) benefit of $(10) and $14)	28	(38)
Unrealized holding losses on available-for-sale securities arising during the period, income taxes	(10)	14
Total comprehensive income	8,402	8,531
Cash flows from operating activities:
Net income and comprehensive income	8,374	8,569
Adjustments to reconcile net income to net cash from operating activities [Abstract]
Equity in undistributed earnings of subsidiaries, net of dividend received from subsidiary	(3,248)	(7,367)
Stock-based compensation	146	218
Deferred income taxes	(885)	(80)
(Increase) decrease in other assets	811	(120)
Increase (decrease) in accrued expenses and other liabilities	(66)	55
Net cash provided by operating activities	5,132	1,275
Cash flows from financing activities [Abstract]
Repayments of long-term borrowings	(3,500)
Preferred stock dividends		(70)
Common stock dividends	(1,789)	(1,511)
Proceeds from common stock issuance	260	374
Net cash (used in) provided by financing activities	(5,029)	(1,207)
(Decrease) increase in cash and cash equivalents	103	68
Cash and cash equivalents at beginning of period	1,378	1,310
Cash and cash equivalents at end of period	$ 1,481	$ 1,378