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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of components of income tax expenses | The following table presents the components of income tax expense for the years indicated:
($ in thousands) |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Current income tax expense (benefit): |  |  |  |  |  |
Federal |  | $ | 120,968 |  |  | $ | 63,642 |  |  | $ | (62,829 | )
State |  | 72,837 |  |  | 48,558 |  |  | (4,750 | )
Foreign |  | 1,815 |  |  | 1,345 |  |  | 409 |
Total current income tax expense (benefit) |  | 195,620 |  |  | 113,545 |  |  | (67,170 | )
Deferred income tax expense (benefit): |  |  |  |  |  |
Federal |  | 40,057 |  |  | 25,296 |  |  | 199,858 |
State |  | (6,201 | ) |  | 1,883 |  |  | 60,437 |
Foreign |  | — |  |  | (213 | ) |  | 919 |
Total deferred income tax expense |  | 33,856 |  |  | 26,966 |  |  | 261,214 |
Income tax expense |  | $ | 229,476 |  |  | $ | 140,511 |  |  | $ | 194,044 |
Schedule of reconciliation of the federal statutory rate to the effective income tax rate | The following table presents the reconciliation of the federal statutory rate to the Company’s effective tax rate for the years ended December 31, 2017, 2016 and 2015:
|  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Federal income tax provision at statutory rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State franchise taxes, net of federal tax effect |  | 5.9 |  |  | 6.1 |  |  | 6.3 |
Tax Cuts and Jobs Act of 2017 (the “Tax Act”) |  | 4.5 |  |  | — |  |  | — |
Tax credits, net of amortization |  | (15.1 | ) |  | (18.3 | ) |  | (8.7 | )
Other, net |  | 0.9 |  |  | 1.8 |  |  | 0.9 |
Effective tax rate |  | 31.2 | % |  | 24.6 | % |  | 33.5 | %
Schedule of tax effects of temporary differences that give rise to significant portions of the deferred tax assets (liabilities) | The tax effects of temporary differences that give rise to a significant portion of deferred tax assets and deferred tax liabilities as of December 31, 2017 and 2016 are presented below:
($ in thousands) |  | December 31,
| 2017 |  | 2016
| Federal |  | State |  | Foreign |  | Total |  | Federal |  | State |  | Foreign |  | Total
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses and OREO reserves |  | $ | 62,942 |  |  | $ | 28,857 |  |  | $ | 1,365 |  |  | $ | 93,164 |  |  | $ | 97,921 |  |  | $ | 27,792 |  |  | $ | 1,365 |  |  | $ | 127,078 |
Deferred compensation |  | 11,483 |  |  | 5,220 |  |  | — |  |  | 16,703 |  |  | 20,093 |  |  | 5,731 |  |  | — |  |  | 25,824 |
Mortgage servicing assets |  | 2,727 |  |  | 1,206 |  |  | — |  |  | 3,933 |  |  | — |  |  | — |  |  | — |  |  | — |
Unrealized losses on securities |  | 10,730 |  |  | 5,354 |  |  | — |  |  | 16,084 |  |  | 16,253 |  |  | 5,315 |  |  | — |  |  | 21,568 |
State taxes |  | 5,217 |  |  | — |  |  | — |  |  | 5,217 |  |  | 1,333 |  |  | — |  |  | — |  |  | 1,333 |
Interest income on nonaccrual loans |  | 5,396 |  |  | 2,451 |  |  | — |  |  | 7,847 |  |  | 4,461 |  |  | 1,258 |  |  | — |  |  | 5,719 |
Other, net |  | 744 |  |  | 5,481 |  |  | 97 |  |  | 6,322 |  |  | 2,053 |  |  | 5,269 |  |  | 97 |  |  | 7,419 |
Total gross deferred tax assets |  | 99,239 |  |  | 48,569 |  |  | 1,462 |  |  | 149,270 |  |  | 142,114 |  |  | 45,365 |  |  | 1,462 |  |  | 188,941 |
Valuation allowance |  | — |  |  | (256 | ) |  | — |  |  | (256 | ) |  | — |  |  | (283 | ) |  | — |  |  | (283 | )
Total deferred tax assets, net of valuation allowance |  | $ | 99,239 |  |  | $ | 48,313 |  |  | $ | 1,462 |  |  | $ | 149,014 |  |  | $ | 142,114 |  |  | $ | 45,082 |  |  | $ | 1,462 |  |  | $ | 188,658 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | (4,408 | ) |  | $ | (2,117 | ) |  | $ | — |  |  | $ | (6,525 | ) |  | $ | (9,768 | ) |  | $ | (2,874 | ) |  | $ | — |  |  | $ | (12,642 | )
Investments in partnerships, tax credit and other investments, net |  | (10,838 | ) |  | 7,025 |  |  | — |  |  | (3,813 | ) |  | (7,012 | ) |  | 5,318 |  |  | — |  |  | (1,694 | )
Fixed assets |  | (2,671 | ) |  | 914 |  |  | — |  |  | (1,757 | ) |  | (13,166 | ) |  | (3,360 | ) |  | — |  |  | (16,526 | )
Equipment financing |  | (21,844 | ) |  | (3,760 | ) |  | — |  |  | (25,604 | ) |  | (13,240 | ) |  | (1,866 | ) |  | — |  |  | (15,106 | )
FHLB stock dividends |  | (1,285 | ) |  | (583 | ) |  | — |  |  | (1,868 | ) |  | (1,189 | ) |  | (335 | ) |  | — |  |  | (1,524 | )
Acquired debt |  | (1,273 | ) |  | (578 | ) |  | — |  |  | (1,851 | ) |  | (2,210 | ) |  | (623 | ) |  | — |  |  | (2,833 | )
Acquired loans and OREO |  | (2,252 | ) |  | (754 | ) |  | (406 | ) |  | (3,412 | ) |  | (5,407 | ) |  | (1,242 | ) |  | (406 | ) |  | (7,055 | )
Prepaid expenses |  | (4,142 | ) |  | (1,517 | ) |  | — |  |  | (5,659 | ) |  | (1,088 | ) |  | (251 | ) |  | — |  |  | (1,339 | )
Other, net |  | (510 | ) |  | (609 | ) |  | — |  |  | (1,119 | ) |  | (121 | ) |  | (120 | ) |  | — |  |  | (241 | )
Total gross deferred tax liabilities |  | $ | (49,223 | ) |  | $ | (1,979 | ) |  | $ | (406 | ) |  | $ | (51,608 | ) |  | $ | (53,201 | ) |  | $ | (5,353 | ) |  | $ | (406 | ) |  | $ | (58,960 | )
Net deferred tax assets |  | $ | 50,016 |  |  | $ | 46,334 |  |  | $ | 1,056 |  |  | $ | 97,406 |  |  | $ | 88,913 |  |  | $ | 39,729 |  |  | $ | 1,056 |  |  | $ | 129,698 |
Summary of the activity related to unrecognized tax benefits | The following table summarizes the activities related to the Company’s unrecognized tax benefits as of the periods indicated:
($ in thousands) |  | Year Ended December 31,
| 2017 |  | 2016
Beginning Balance |  | $ | 10,419 |  |  | $ | 7,125 |
Additions for tax positions related to prior years |  | — |  |  | 5,819 |
Settlements with taxing authorities |  | — |  |  | (2,525 | )
Ending Balance |  | $ | 10,419 |  |  | $ | 10,419 |

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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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