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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract] |  |  |
Income Tax Reconciliation State And Local Income Taxes | $ 51,792 | $ 26,555 | $ 33,220
Income Tax Reconciliation Tax Exempt Income | (6,645) | (9,506) | (11,178)
Income Tax Reconciliation Disallowed net operating loss carryover | (269) | (281) | (1,406)
Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance | 1,504 | (305) | (9)
Interest and Penalties Released Related to Unrecognized Tax Benefits | (386) | (775) | (135)
Income Tax Reconciliation Change In Enacted Tax Rate | 4,069 | 0 | 0
Income Tax Reconciliation Capital (gain) loss at preferential rate | (20) | (279) | 2,394
Income Tax Reconciliation Other Adjustments | (2,193) | (528) | 296
Total Income Tax Expense (Benefit) | $ 48,390 | $ 15,443 | $ 25,994
EffectiveIncome Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract] |  |  |
Statutary tax rate | 39.00% | 39.00% | 39.00%
Tax effect of exempt income, net | (5.01%) | (13.96%) | (13.12%)
Effective Income Tax Rate Disallowed Net Operating Loss Carryover | (0.20%) | (0.41%) | (1.65%)
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance | 1.13% | (0.45%) | (0.01%)
Effective Income Tax Rate Reconciliation Tax Contingencies | (0.29%) | (1.14%) | (0.16%)
Effect in deferred taxes due to increase or decrease in tax rates | 3.06% | 0.00% | 0.00%
Effective Income Tax Rate Capital Loss (Gain) at Preferential Rate | (0.02%) | (0.41%) | 2.81%
Other items, net | (1.63%) | (0.79%) | 0.34%
Total Income Tax Expense (Benefit) | 36.44% | 22.66% | 30.51%

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