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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Deferred Tax Assets and Liabilities | Net deferred tax assets and liabilities consist of the following components as of December 31, 2019 and 2018 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Deferred tax assets: |  | ​ |  |  | ​ |
Loan losses | ​ | $ | 18,938 | ​ | $ | 19,369
Benefit plans | ​ |  | 3,507 | ​ |  | 3,925
Acquisition accounting | ​ |  | 16,021 | ​ |  | 11,788
Lease right-of-use asset | ​ | ​ | 13,507 | ​ | ​ | —
Stock grants | ​ |  | 2,032 | ​ |  | 894
OREO | ​ |  | 3,295 | ​ |  | 2,515
Securities available for sale | ​ |  | 1,169 | ​ |  | 1,577
Net operating losses | ​ |  | 55,023 | ​ |  | 66,037
Nonaccrual loans | ​ |  | 3,243 | ​ |  | 3,990
Other | ​ |  | 4,227 | ​ |  | 4,618
Total deferred tax assets | ​ | $ | 120,962 | ​ | $ | 114,713
Deferred tax liabilities: | ​ |  |  | ​ |  |
Acquisition accounting | ​ | $ | 19,815 | ​ | $ | 13,053
Lease right-of-use liability | ​ | ​ | 11,191 | ​ | ​ | —
Premises and equipment | ​ |  | 6,696 | ​ |  | 3,877
Securities available for sale | ​ |  | 10,069 | ​ |  | 25
Other | ​ |  | 511 | ​ |  | 583
Total deferred tax liabilities | ​ |  | 48,282 | ​ |  | 17,538
Net deferred tax asset | ​ | $ | 72,680 | ​ | $ | 97,175
Provision for Income Taxes Charged to Operations | The provision for income taxes charged to continuing operations for the years ended December 31, 2019, 2018, and 2017 consists of the following (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Current tax expense | ​ | $ | 22,500 | ​ | $ | 12,114 | ​ | $ | 27,255
Deferred tax expense (1) | ​ |  | 15,057 | ​ |  | 17,902 | ​ |  | 5,535
Income tax expense | ​ | $ | 37,557 | ​ | $ | 30,016 | ​ | $ | 32,790
(1) | The deferred tax expense for the year ended December 31, 2017 includes the impact of the Tax Act.
Schedule of Income Tax Expense, Difference in Income Tax Rate to Pretax Income | The income tax expense differs from the amount of income tax determined by applying the U.S. federal income tax rate to pre-tax income for the years ended December 31, 2019, 2018, and 2017, due to the following (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Computed "expected" tax expense | ​ | $ | 48,564 | ​ | $ | 37,680 | ​ | $ | 36,738
(Decrease) in taxes resulting from: | ​ |  |  | ​ |  |  | ​ |  |
Tax-exempt interest income, net | ​ |  | (8,259) | ​ |  | (5,188) | ​ |  | (6,112)
Valuation allowance adjustment | ​ |  | — | ​ |  | — | ​ |  | (2,982)
Impact of the Tax Act | ​ |  | — | ​ |  | — | ​ |  | 6,105
State income tax benefit | ​ | ​ | (1,078) | ​ | ​ | (1,133) | ​ | ​ | —
Other, net | ​ |  | (1,670) | ​ |  | (1,343) | ​ |  | (959)
Income tax expense | ​ | $ | 37,557 | ​ | $ | 30,016 | ​ | $ | 32,790

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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