Spin-Off and Merger - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 6,820	$ 12,327	$ 14,222	$ 19,336
Net income (loss)	23,663	23,722	47,804	49,469
Preferred stock dividends	3,615	3,615	7,229	7,229
Net income (loss) available to common shareholders	$ 20,048	20,107	$ 40,575	42,240
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income		93,852		176,946
Interest expense		25,246		45,922
Net interest income		68,606		131,024
Provision for loan losses		535		3,585
Non-interest income		18,391		41,144
Non-interest expense		50,413		99,778
Income from continuing operations before income taxes		36,049		68,805
Income tax expense		12,327		19,336
Net income from continuing operations		23,722		49,469
Loss from discontinued operations before income tax benefit		0		0
Income tax benefit from discontinued operations		0		0
Net loss from discontinued operations		0		0
Net income (loss)		23,722		49,469
Preferred stock dividends		3,615		7,229
Net income (loss) available to common shareholders		20,107		42,240
Previously Reported | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income		93,852		176,946
Interest expense		25,236		45,906
Net interest income		68,616		131,040
Provision for loan losses		535		3,585
Non-interest income		6,971		12,398
Non-interest expense		30,567		60,714
Income from continuing operations before income taxes		44,485		79,139
Income tax expense		15,533		23,263
Net income from continuing operations		28,952		55,876
Loss from discontinued operations before income tax benefit		(8,436)		(10,334)
Income tax benefit from discontinued operations		(3,206)		(3,927)
Net loss from discontinued operations		(5,230)		(6,407)
Net income (loss)		23,722		49,469
Preferred stock dividends		3,615		7,229
Net income (loss) available to common shareholders		20,107		42,240
Restatement Adjustment | BankMobile | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income		0		0
Interest expense		10		16
Net interest income		(10)		(16)
Provision for loan losses		0		0
Non-interest income		11,420		28,746
Non-interest expense		19,846		39,064
Income from continuing operations before income taxes		(8,436)		(10,334)
Income tax expense		(3,206)		(3,927)
Net income from continuing operations		(5,230)		(6,407)
Loss from discontinued operations before income tax benefit		8,436		10,334
Income tax benefit from discontinued operations		3,206		3,927
Net loss from discontinued operations		5,230		6,407
Net income (loss)		0		0
Preferred stock dividends		0		0
Net income (loss) available to common shareholders		$ 0		$ 0