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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract |  |  |
Tax (benefit) expense at statutory rates | $ (7,823,000) | $ 47,749,000 | $ 34,997
Tax effect of exempt income, net | (8,625,000) | (10,002,000) | (4,652)
Effect of tax rate on capital loss carryforward | 0 | 0 | (840)
Disallowed net operating loss carryover | (556,000) | (8,289,000) | 0
Change In Deferred Tax Assets Valuation Allowance | (2,219,000) | (958,000) | 1,896
Release of unrecognized tax benefits, net | (385,000) | (1,093,000) | (1,559)
Effect in deferred taxes due to increase or decrease in tax rate | 0 | 0 | (38,068)
Loan Tax Basis Change Effect | 0 | (7,642,000) | 0
Effect Of Change In Tax Of Unit Segment | 0 | 0 | 148
IncomeTax Reconciliation Unrealized Capital Loss | 283,000 | 0 | 0
Income Tax Reconciliation Other Adjustments | 659,000 | 909,000 | (2,311)
Total Income Tax Expense (Benefit) | $ (17,554,000) | $ 37,252,000 | $ (8,709,000)
EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract |  |  |
Tax at statutory rates | (39.00%) | 39.00% | 39.00%
Tax effect of exempt income, net | (43.00%) | (26.85%) | 4.90%
Effective Income Tax Rate Reconciliation Capital Loss Carryforward | 0.00% | 0.00% | (0.94%)
Effective Income Tax Rate Disallowed Net Operating Loss Carryover | (2.77%) | (22.25%) | 0.00%
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance | (11.06%) | (2.57%) | 2.11%
Effective Income Tax Rate Reconciliation Release of Unrecognized Tax Benefits, net | (1.92%) | (2.94%) | (1.57%)
Effect in deferred taxes due to increase or decrease in tax rates | 0.00% | 0.00% | (43.04%)
Effective Income Tax Rate Loan Basis Change Effect | 0.00% | (20.51%) | 0.00%
Effect of change in tax of IBE tax rate | 0.00% | 0.00% | 0.17%
Effective Income Tax Rate Unrealized Capital Loss | 1.41% | 0.00% | 0.00%
Other items, net | 3.28% | 2.00% | (2.58%)
Total Income Tax Expense (Benefit) | (87.52%) | 10.82% | (9.70%)

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