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Tax-Free Spin-Off and Merger - Income Statement Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Provision for income taxes $ 10,806 $ 14,899 $ 12,327 $ 7,009 $ 9,320 $ 14,558 $ 12,963 $ 9,052 $ 45,042 $ 45,893 $ 29,912
Net income from continuing operations 21,615 7,754 23,722 25,747 19,828 21,207 19,483 18,184 78,837 78,702 58,583
Net income                 78,837 78,702 58,583
Preferred stock dividends 3,615 3,615 3,615 3,615 3,615 2,552 2,062 1,286 14,459 9,515 2,493
Net income available to common shareholders $ 18,000 $ 4,139 $ 20,107 $ 22,132 $ 16,213 $ 18,655 $ 17,421 $ 16,898 $ 64,378 69,187 56,090
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                   322,539 249,850
Interest expense                   73,042 53,560
Net interest income                   249,497 196,290
Provision for loan losses                   3,041 20,566
Non-interest income                   56,370 27,717
Non-interest expense                   178,231 114,946
Income from continuing operations before income taxes                   124,595 88,495
Provision for income taxes                   45,893 29,912
Net income from continuing operations                   78,702 58,583
Loss from discontinued operations before income taxes                   0 0
Income tax benefit from discontinued operations                   0 0
Net loss from discontinued operations                   0 0
Net income                   78,702 58,583
Preferred stock dividends                   9,515 2,493
Net income available to common shareholders                   69,187 56,090
As 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                   322,539 249,850
Interest expense                   73,023 53,551
Net interest income                   249,516 196,299
Provision for loan losses                   2,345 20,566
Non-interest income                   23,165 27,572
Non-interest expense                   131,217 107,568
Income from continuing operations before income taxes                   139,119 95,737
Provision for income taxes                   51,412 32,664
Net income from continuing operations                   87,707 63,073
Loss from discontinued operations before income taxes                   (14,524) (7,242)
Income tax benefit from discontinued operations                   (5,519) (2,752)
Net loss from discontinued operations                   (9,005) (4,490)
Net income                   78,702 58,583
Preferred stock dividends                   9,515 2,493
Net income available to common shareholders                   69,187 56,090
BankMobile | Restatement Adjustment | 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                   19 9
Net interest income                   (19) (9)
Provision for loan losses                   696 0
Non-interest income                   33,205 145
Non-interest expense                   47,014 7,378
Income from continuing operations before income taxes                   (14,524) (7,242)
Provision for income taxes                   (5,519) (2,752)
Net income from continuing operations                   (9,005) (4,490)
Loss from discontinued operations before income taxes                   14,524 7,242
Income tax benefit from discontinued operations                   5,519 2,752
Net loss from discontinued operations                   9,005 4,490
Net income                   0 0
Preferred stock dividends                   0 0
Net income available to common shareholders                   $ 0 $ 0