Condensed Financial Information-Parent Only (Schedule Of Condensed Cash Flow Statement) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 1,854,000	$ 20,425,000	$ 11,350,000	$ 17,930,000	$ 7,119,000	$ 61,277,000	$ 6,141,000	$ 14,140,000	$ 51,559,000	$ 88,677,000	$ 21,673,000
(Increase) decrease in other assets									(10,422,000)	(8,184,000)	5,678,000
Increase (decrease) in other liabilities									10,920,000	8,655,000	(18,504,000)
Stock-based compensation expense									5,689,000	3,450,000	3,245,000
Net cash used in operating activities									(493,083,000)	(173,961,000)	(28,091,000)
Investing activities
Net (increase) decrease in loans									(322,611,000)	(115,054,000)	(172,853,000)
Net cash (used in) provided by investing activities									(233,310,000)	84,468,000	(84,315,000)
Financing activities
Proceeds from issuance of common stock											(200,000)
Proceeds from the exercise of common stock options									258,000	112,000
Net cash provided by (used in) financing activities									1,116,563,000	(265,140,000)	22,281,000
Net increase (decrease) in cash and cash equivalents									390,170,000	(354,633,000)	(90,125,000)
Cash and cash equivalents, beginning of period				554,302,000				908,935,000	554,302,000	908,935,000	999,059,000
Cash and cash equivalents, end of period	944,472,000				554,302,000				944,472,000	554,302,000	908,935,000
The Bancorp, Inc. [Member]
Operating activities
Net income									51,559,000	88,677,000	21,673,000
(Increase) decrease in other assets									724,000	(22,000)	3,045,000
Increase (decrease) in other liabilities									(4,000)	6,000	5,000
Stock-based compensation expense									5,689,000	3,450,000	3,245,000
Equity in undistributed income loss									(59,030,000)	(93,402,000)	(25,097,000)
Net cash used in operating activities									(1,062,000)	(1,291,000)	2,871,000
Financing activities
Proceeds from the exercise of common stock options									258,000	111,000
Proceeds from advances from subsidiaries											4,128,000
Net cash provided by (used in) financing activities									258,000	111,000	4,128,000
Net increase (decrease) in cash and cash equivalents									(804,000)	(1,180,000)	6,999,000
Cash and cash equivalents, beginning of period				$ 14,090,000				$ 15,270,000	14,090,000	15,270,000	8,271,000
Cash and cash equivalents, end of period	$ 13,286,000				$ 14,090,000				$ 13,286,000	$ 14,090,000	$ 15,270,000