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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Difference between the provision for income taxes and taxes computed by applying the federal statutory income tax rate to income before provision for income taxes |  |  |
Income taxes at federal statutory rate | $ 21,834 | $ 48,389 | $ 47,094
Increase (reduction) of taxes resulting from: |  |  |
State income taxes, net of federal tax benefit | 3,077 | 4,080 | 5,916
Non- deductible merger expenses | 1,344 |  |
Increase in cash surrender value of BOLI policies | (2,389) | (1,210) | (1,261)
Tax-exempt interest | (2,257) | (1,877) | (2,037)
Income tax credits | (7,138) | (6,881) | (3,118)
Non-deductible FDIC premiums | 1,364 | 133 | 191
Non-deductible executive compensation | 1,016 | 315 | 305
Revaluation of net deferred tax asset due to tax law change |  |  | (991)
Benefit of tax loss carryback under CARES Act | (31,468) |  |
Other, net | (2,043) | 993 | (715)
(Benefit) provision for income taxes | (16,660) | 43,942 | $ 45,384
Components of the net deferred tax asset |  |  |
Allowance for loan losses | 119,602 | 14,468 |
Other-than-temporary impairment on securities | 268 | 250 |
Share-based compensation | 2,807 | 4,975 |
Pension plan and post-retirement benefits | 516 | 494 |
Deferred compensation | 13,671 | 12,475 |
Purchase accounting adjustments | 11,772 | 24,530 |
Other real estate owned | 899 | 380 |
Net operating loss and tax credit carryforwards | 26,229 | 10,347 |
Deferred loan fees and costs | 12,826 |  |
Nonaccrual Interest | 3,141 |  |
Lease liability | 28,179 | 19,146 |
Cash flow hedge |  | 3,034 |
Other | 603 | 1,040 |
Total deferred tax assets | 220,513 | 91,139 |
Unrealized gains on investment securities available for sale | 13,026 | 2,373 |
Depreciation | 18,326 | 6,585 |
Intangible assets | 34,648 | 9,979 |
Net deferred loan costs |  | 9,082 |
Right of use assets | 27,012 | 19,465 |
Prepaid expense | 1,950 | 474 |
Tax deductible goodwill | 1,302 | 810 |
Mortgage servicing rights | 6,134 | 6,688 |
Other | 1,534 | 480 |
Total deferred tax liabilities | 103,932 | 55,936 |
Net deferred tax assets before valuation allowance | 116,581 | 35,203 |
Less, valuation allowance | (5,635) | (3,887) |
Net deferred tax assets | $ 110,946 | $ 31,316 |

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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