Summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary of significant accounting policies

Schedule of earnings per share basic and diluted under two-class method

	2011		2010				2009
	Basic	Diluted	Basic		Diluted		Basic and diluted
Distributed earnings	$ 1.24	$ 1.24	$ 1.24		$ 1.24		$ 1.24
Undistributed earnings (loss)	0.21	0.20	(0.02	)	(0.03	)	(0.33	)
	$ 1.45	$ 1.44	$ 1.22		$ 1.21		$ 0.91

Schedule of amortized intangible assets

Amortized intangible assets.

December 31	2011				2010
	Gross carrying	Accumulated	Valuation	Net carrying	Gross carrying	Accumulated	Valuation	Net carrying
(in thousands)	amount	amortization	allowance	amount	amount	amortization	allowance	amount
Mortgage servicing assets	$21,171	(12,769)	(175)	$8,227	$18,483	(11,656)	(128)	$6,699

Schedule of changes in valuation allowance for mortgage servicing assets

(in thousands)	2011		2010		2009
Valuation allowance, January 1	$128		$201		$268
Provision (recovery)	121		(12	)	166
Other-than-temporary impairment	(74	)	(61	)	(233	)
Valuation allowance, December 31	$175		$128		$201