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Business Segments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) Segment | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) Segment | Jun. 30, 2016 Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments (segment) | Segment |  |  |  |  |  | 2 |  |  | 2 | 1 |  |  |
Effective income tax rate |  |  |  |  |  |  |  |  |  |  | 36.36% | 36.83% | 33.80%
Interest income | $ 97,619 | $ 98,285 | $ 93,852 | $ 83,094 | $ 83,609 | $ 84,212 | $ 81,321 | $ 73,398 |  |  | $ 372,850 | $ 322,539 | $ 249,850
Interest | 29,319 | 30,266 | 25,246 | 20,676 | 19,481 | 19,627 | 18,163 | 15,771 |  |  | 105,507 | 73,042 | 53,560
Net interest income | 68,300 | 68,019 | 68,606 | 62,418 | 64,128 | 64,585 | 63,158 | 57,627 |  |  | 267,343 | 249,497 | 196,290
Provision for loan losses | 831 | 2,352 | 535 | 3,050 | 187 | 88 | 786 | 1,980 |  |  | 6,768 | 3,041 | 20,566
Non-interest income | 19,740 | 18,026 | 18,391 | 22,754 | 15,131 | 27,486 | 8,257 | 5,494 |  |  | 78,910 | 56,370 | 27,717
Non-interest expenses | 54,788 | 61,040 | 50,413 | 49,366 | 49,924 | 56,218 | 38,183 | 33,905 |  |  | 215,606 | 178,231 | 114,946
Income before income taxes | 32,421 | 22,653 | 36,049 | 32,756 | 29,148 | 35,765 | 32,446 | 27,236 |  |  |  |  |
Income tax expense | 10,806 | 14,899 | 12,327 | 7,009 | 9,320 | 14,558 | 12,963 | 9,052 |  |  | 45,042 | 45,893 | 29,912
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
Goodwill and other intangibles | 16,295 |  |  |  | 17,621 |  |  |  | $ 17,621 |  | 16,295 | 17,621 |
Total assets | 9,839,555 |  |  |  | 9,382,736 |  |  |  | 9,382,736 |  | 9,839,555 | 9,382,736 |
Total deposits | 6,800,142 |  |  |  | 7,303,775 |  |  |  | 7,303,775 |  | 6,800,142 | 7,303,775 |
Consolidated |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 372,850 | 322,539 | 249,850
Interest |  |  |  |  |  |  |  |  |  |  | 105,507 | 73,042 | 53,560
Net interest income |  |  |  |  |  |  |  |  |  |  | 267,343 | 249,497 | 196,290
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 6,768 | 3,041 | 20,566
Non-interest income |  |  |  |  |  |  |  |  |  |  | 78,910 | 56,370 | 27,717
Non-interest expenses |  |  |  |  |  |  |  |  |  |  | 215,606 | 178,231 | 114,946
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 123,879 | 124,595 | 88,495
Income tax expense |  |  |  |  |  |  |  |  |  |  | 45,042 | 45,893 | 29,912
Net income |  |  |  |  |  |  |  |  |  |  | 78,837 | 78,702 | 58,583
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  | 14,459 | 9,515 | 2,493
Net income available to common shareholders |  |  |  |  |  |  |  |  |  |  | 64,378 | 69,187 | 56,090
Goodwill and other intangibles | 16,295 |  |  |  | 17,621 |  |  |  | 17,621 |  | 16,295 | 17,621 | 3,651
Total assets | 9,839,555 |  |  |  | 9,382,736 |  |  |  | 9,382,736 |  | 9,839,555 | 9,382,736 | 8,398,205
Total deposits | 6,800,142 |  |  |  | 7,303,775 |  |  |  | 7,303,775 |  | 6,800,142 | 7,303,775 | 5,909,501
Total non-deposit liabilities | 2,118,449 |  |  |  | 1,223,089 |  |  |  | 1,223,089 |  | $ 2,118,449 | $ 1,223,089 | $ 1,934,802
Operating Segments | Community Business Banking |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  |  |  |  |  |  | 37.67% | 38.00% | 38.00%
Interest income |  |  |  |  |  |  |  |  |  |  | $ 359,931 | $ 315,643 | $ 243,404
Interest |  |  |  |  |  |  |  |  |  |  | 105,438 | 73,004 | 53,536
Net interest income |  |  |  |  |  |  |  |  |  |  | 254,493 | 242,639 | 189,868
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 5,638 | 2,246 | 20,562
Non-interest income |  |  |  |  |  |  |  |  |  |  | 24,788 | 23,165 | 27,573
Non-interest expenses |  |  |  |  |  |  |  |  |  |  | 128,604 | 130,394 | 107,569
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 145,039 | 133,164 | 89,310
Income tax expense |  |  |  |  |  |  |  |  |  |  | 53,013 | 49,149 | 30,221
Net income |  |  |  |  |  |  |  |  |  |  | 92,026 | 84,015 | 59,089
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  | 14,459 | 9,515 | 2,493
Net income available to common shareholders |  |  |  |  |  |  |  |  |  |  | 77,567 | 74,500 | 56,596
Goodwill and other intangibles | 3,630 |  |  |  | 3,639 |  |  |  | 3,639 |  | 3,630 | 3,639 | 3,651
Total assets | 9,769,996 |  |  |  | 9,303,465 |  |  |  | 9,303,465 |  | 9,769,996 | 9,303,465 | 8,395,525
Total deposits | 6,400,310 |  |  |  | 6,846,980 |  |  |  | 6,846,980 |  | 6,400,310 | 6,846,980 | 5,662,433
Total non-deposit liabilities | 2,106,919 |  |  |  | 1,195,087 |  |  |  | 1,195,087 |  | 2,106,919 | 1,195,087 | 1,934,731
Operating Segments | BankMobile |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 12,919 | 6,896 | 6,446
Interest |  |  |  |  |  |  |  |  |  |  | 69 | 38 | 24
Net interest income |  |  |  |  |  |  |  |  |  |  | 12,850 | 6,858 | 6,422
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 1,130 | 795 | 4
Non-interest income |  |  |  |  |  |  |  |  |  |  | 54,122 | 33,205 | 144
Non-interest expenses |  |  |  |  |  |  |  |  |  |  | 87,002 | 47,837 | 7,377
Income before income taxes |  |  |  |  |  |  |  |  |  |  | (21,160) | (8,569) | (815)
Income tax expense |  |  |  |  |  |  |  |  |  |  | (7,971) | (3,256) | (309)
Net income |  |  |  |  |  |  |  |  |  |  | (13,189) | (5,313) | (506)
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income available to common shareholders |  |  |  |  |  |  |  |  |  |  | (13,189) | (5,313) | (506)
Goodwill and other intangibles | 12,665 |  |  |  | 13,982 |  |  |  | 13,982 |  | 12,665 | 13,982 | 0
Total assets | 69,559 |  |  |  | 79,271 |  |  |  | 79,271 |  | 69,559 | 79,271 | 2,680
Total deposits | 399,832 |  |  |  | 456,795 |  |  |  | 456,795 |  | 399,832 | 456,795 | 247,068
Total non-deposit liabilities | $ 11,530 |  |  |  | $ 28,002 |  |  |  | $ 28,002 |  | 11,530 | 28,002 | 71
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | $ 12,900 | 6,900 | $ 6,400
Non-interest expenses |  |  |  |  |  |  |  |  |  |  |  | $ 800 |

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