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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of current and deferred portions of net income tax expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
​ | ​ | (Dollars in Thousands) |
Current |  | ​ |  |  | ​ |  |  | ​ |  | ​
U.S. | ​ | $ | 43,794 | ​ | $ | 48,559 | ​ | $ | 48,144 | ​
State | ​ |  | 3,709 | ​ |  | 2,944 | ​ |  | 3,370 | ​
Foreign | ​ |  | 58 | ​ |  | 38 | ​ |  | (5) | ​
Total current taxes | ​ |  | 47,561 | ​ |  | 51,541 | ​ |  | 51,509 | ​
Deferred | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. | ​ |  | (2,733) | ​ |  | 2,979 | ​ |  | 5,130 | ​
State | ​ |  | (389) | ​ |  | 330 | ​ |  | 13 | ​
Total deferred taxes | ​ |  | (3,122) | ​ |  | 3,309 | ​ |  | 5,143 | ​
Total income taxes | ​ | $ | 44,439 | ​ | $ | 54,850 | ​ | $ | 56,652 | ​
Schedule of income tax expense differences from the amount computed by applying the U.S. Federal income tax rate to income before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
​ | ​ | (Dollars in Thousands) |
Computed expected tax expense |  | $ | 45,218 |  | $ | 55,086 |  | $ | 57,831 | ​
Change in taxes resulting from: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt interest income | ​ |  | (2,709) | ​ |  | (2,550) | ​ |  | (3,101) | ​
State tax, net of federal income taxes, tax credit and refunds | ​ |  | 2,622 | ​ |  | 2,587 | ​ |  | 2,673 | ​
Resolution of IRS exam | ​ |  | ​ | ​ |  | — | ​ |  | — | ​
Other investment income | ​ |  | (2,205) | ​ |  | (1,480) | ​ |  | (1,561) | ​
Deferred tax adjustment due to federal tax rate change | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | (1,618) | ​
Net investment in low income housing investments | ​ | ​ | 1,990 | ​ | ​ | 623 | ​ | ​ | 2,518 | ​
Other | ​ |  | (477) | ​ |  | 584 | ​ |  | (90) | ​
Actual tax expense | ​ | $ | 44,439 | ​ | $ | 54,850 | ​ | $ | 56,652 | ​
Schedule of tax effects of temporary difference that give rise to significant portions of the deferred tax assets and deferred tax liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 |
​ | ​ | (Dollars in Thousands) |
Deferred tax assets: |  | ​ |  |  | ​ |  | ​
Loans receivable, principally due to the allowance for probable loan losses | ​ | $ | 21,921 | ​ | $ | 12,050 | ​
Other real estate owned | ​ |  | 1,183 | ​ |  | 2,501 | ​
Impairment charges on available-for-sale securities | ​ |  | — | ​ |  | 1,054 | ​
Accrued expenses | ​ |  | 81 | ​ |  | 98 | ​
Other | ​ |  | 5,649 | ​ |  | 6,019 | ​
Total deferred tax assets | ​ |  | 28,834 | ​ |  | 21,722 | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Bank premises and equipment, principally due to differences on depreciation | ​ |  | (12,350) | ​ |  | (12,478) | ​
Net unrealized gains on available for sale investment securities | ​ | ​ | (5,679) | ​ | ​ | (508) | ​
Impairment charges on available-for-sale securities | ​ | ​ | (19) | ​ | ​ | — | ​
Identified intangible assets and goodwill | ​ |  | (13,807) | ​ |  | (13,649) | ​
Other | ​ |  | (20,551) | ​ |  | (18,849) | ​
Total deferred tax liabilities | ​ |  | (52,406) | ​ |  | (45,484) | ​
Net deferred tax liability | ​ | $ | (23,572) | ​ | $ | (23,762) | ​

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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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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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