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

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