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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)	12 Months Ended
	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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