Income taxes (Significant Components of the Net Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Deferred tax assets:
Reserve for loan losses and unfunded loan commitments	$ 8,530		$ 10,982
Deferred benefit plan expenses, net	8,700		7,448
Federal and state net operating loss and other carryforwards	33,823		20,325
Tax credit carryforwards	1,112		547
Allowance for losses on OREO	2,167		5,364
Accrued interest on non-accrual loans	231		494
Purchased intangibles related to CBGP	86		86
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities,Net	21		0
Other	284		35
Deferred tax assets	54,954		45,281
Valuation allowance for deferred tax assets	(74)	(41,600)	(41,698)
Deferred tax assets, net of valuation allowance	54,880		3,583
Deferred tax liabilities:
Accumulated depreciation and amortization	2,821		1,730
Deferred loan fees	711		809
FHLB stock dividends	556		556
Net unrealized gains on investment securities available-for-sale	0		2,258
Other	724		488
Deferred tax liabilities	4,812		5,841
Net deferred tax assets (liabilities)	$ 50,068		$ (2,258)