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Income taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Effect of change in tax due to unrealized capital loss (gain).

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The portion of the difference between total income tax rate for the period and the expected statutory income tax rates attributable to disallowed net loss carryover loss carryforwards

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to disallowed net operating loss carryforwards

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