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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract |  |  |
Income Tax Reconciliation State And Local Income Taxes | $ 33,220 | $ (7,823) | $ 47,749
Income Tax Reconciliation Tax Exempt Income | (11,178) | (8,625) | (10,002)
Income Tax Reconciliation Disallowed net operating loss carryover | 1,406 | 556 | 8,289
Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance | (9) | (2,219) | (958)
Income Tax Reconciliation Tax Contingencies | (135) | (385) | (1,093)
Income Tax Loan Basis Change Effect | 0 |  | (7,642)
Income Tax Reconciliation Capital (gain) loss at preferential rate | 2,394 | 283 | 0
Income Tax Reconciliation Other Adjustments | 296 | 659 | 909
Total Income Tax Expense (Benefit) | $ 25,994 | $ (17,554) | $ 37,252
EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract |  |  |
Tax at statutory rates | 39.00% | (39.00%) | 39.00%
Tax effect of exempt income, net | (13.12%) | (43.00%) | (26.85%)
Effective Income Tax Rate Disallowed Net Operating Loss Carryover | 1.65% | 2.77% | 22.25%
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance | (0.01%) | (11.06%) | (2.57%)
Effective Income Tax Rate Reconciliation Tax Contingencies | (0.16%) | (1.92%) | (2.94%)
Effective Income Tax Rate Loan Basis Change Effect | 0.00% | 0.00% | (20.51%)
Effective Income Tax Rate Capital Loss (Gain) at Preferential Rate | 2.81% | 1.41% | 0.00%
Other items, net | 0.34% | 3.28% | 2.00%
Total Income Tax Expense (Benefit) | 30.51% | (87.52%) | 10.82%

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