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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of components of income tax expense/benefit | The following table presents the components of income tax expense (benefit) for the years ended December 31, 2021, 2020 and 2019:
($ in thousands) |  | Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Current income tax expense (benefit): |  |  |  |  |  |
Federal |  | $ | 84,249 |  |  | $ | 84,560 |  |  | $ | 107,393 |
State |  | 95,939 |  |  | 74,252 |  |  | 86,578 |
Foreign |  | (1,554) |  |  | 671 |  |  | (2,485) |
Total current income tax expense |  | 178,634 |  |  | 159,483 |  |  | 191,486 |
Deferred income tax expense (benefit): |  |  |  |  |  |
Federal |  | 1,528 |  |  | (28,093) |  |  | (8,801) |
State |  | 3,259 |  |  | (11,671) |  |  | (16,390) |
Foreign |  | (25) |  |  | (1,751) |  |  | 3,587 |
Total deferred income tax expense (benefit) |  | 4,762 |  |  | (41,515) |  |  | (21,604) |
Income tax expense |  | $ | 183,396 |  |  | $ | 117,968 |  |  | $ | 169,882 |
Schedule of reconciliation of the federal statutory rate to the effective 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, 2021, 2020 and 2019:
|  | Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Statutory U.S. federal tax rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
U.S. state income taxes, net of U.S. federal income tax effect |  | 7.4 |  |  | 7.2 |  |  | 7.1 |
Tax credits and benefits, net of related expenses |  | (11.3) |  |  | (12.4) |  |  | (6.8) |
Other, net |  | 0.3 |  |  | 1.4 |  |  | (1.2) |
Effective tax rate |  | 17.4 | % |  | 17.2 | % |  | 20.1 | %
Schedule of temporary differences that give rise to a significant portion of deferred tax assets and liabilities | The following table summarizes the tax effects of temporary differences that give rise to a significant portion of deferred tax assets and liabilities as of December 31, 2021 and 2020:
($ in thousands) |  |  |  |  |  |  |  | December 31,
|  |  |  |  |  |  | 2021 |  |  |  |  |  |  |  | 2020
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  |  | $ | 166,398 |  |  |  |  |  |  |  |  | $ | 192,534 |
Investments in qualified affordable housing partnerships, tax credit and other investments, net |  |  |  |  |  |  |  | 14,977 |  |  |  |  |  |  |  |  | 11,174 |
Deferred compensation |  |  |  |  |  |  |  | 23,954 |  |  |  |  |  |  |  |  | 23,604 |
Interest income on nonaccrual loans |  |  |  |  |  |  |  | 4,192 |  |  |  |  |  |  |  |  | 5,909 |
State taxes |  |  |  |  |  |  |  | 5,237 |  |  |  |  |  |  |  |  | 273 |
Unrealized losses on securities |  |  |  |  |  |  |  | 37,423 |  |  |  |  |  |  |  |  | — |
Tax credit carryforwards |  |  |  |  |  |  |  | 8,692 |  |  |  |  |  |  |  |  | — |
Premises and equipment |  |  |  |  |  |  |  | 1,434 |  |  |  |  |  |  |  |  | 2,096 |
Lease liabilities |  |  |  |  |  |  |  | 31,324 |  |  |  |  |  |  |  |  | 30,554 |
Other |  |  |  |  |  |  |  | 1,018 |  |  |  |  |  |  |  |  | 1,441 |
Total deferred tax assets |  |  |  |  |  |  |  | $ | 294,649 |  |  |  |  |  |  |  |  | $ | 267,585 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equipment lease financing |  |  |  |  |  |  |  | $ | 26,607 |  |  |  |  |  |  |  |  | $ | 29,990 |
Investments in qualified affordable housing partnerships, tax credit and other investments, net |  |  |  |  |  |  |  | 12,187 |  |  |  |  |  |  |  |  | 14,912 |
Core deposit intangibles |  |  |  |  |  |  |  | 1,119 |  |  |  |  |  |  |  |  | 1,934 |
FHLB stock dividends |  |  |  |  |  |  |  | 1,886 |  |  |  |  |  |  |  |  | 1,855 |
Mortgage servicing assets |  |  |  |  |  |  |  | 1,759 |  |  |  |  |  |  |  |  | 1,675 |
Acquired debts |  |  |  |  |  |  |  | 1,536 |  |  |  |  |  |  |  |  | 1,597 |
Prepaid expenses |  |  |  |  |  |  |  | 1,525 |  |  |  |  |  |  |  |  | 1,194 |
Premises and equipment |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 99 |
Unrealized gains on securities |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  | 21,593 |
Operating lease right-of-use assets |  |  |  |  |  |  |  | 29,472 |  |  |  |  |  |  |  |  | 28,468 |
Other |  |  |  |  |  |  |  | 428 |  |  |  |  |  |  |  |  | 453 |
Total deferred tax liabilities |  |  |  |  |  |  |  | $ | 76,519 |  |  |  |  |  |  |  |  | $ | 103,770 |
Net deferred tax assets |  |  |  |  |  |  |  | $ | 218,130 |  |  |  |  |  |  |  |  | $ | 163,815 |
Schedule of reconciliation of the beginning and ending amounts of unrecognized tax benefits | The following table presents a reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years ended December 31, 2021, 2020 and 2019:
($ in thousands) |  | Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Beginning balance |  | $ | 5,045 |  |  | $ | — |  |  | $ | 4,378 |
Additions for tax positions related to prior years |  | — |  |  | 5,045 |  |  | 30,103 |
Deductions for tax positions related to prior years |  | — |  |  | — |  |  | (34,481) |
Ending balance |  | $ | 5,045 |  |  | $ | 5,045 |  |  | $ | — |

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