Income taxes (Tables)
12 Months Ended
Dec. 31, 2014
Income Tax Disclosure [Abstract]  
Schedule of income tax benefit (provision)
The benefit (provision) for income taxes for the years ended December 31, 2014, 2013, and 2012 was approximately as follows (dollars in thousands):
 
2014
 
2013
 
2012
Current:
 
 
 
 
 
Federal
$
(185
)
 
$
30

 
$
58

 State
(30
)
 
(27
)
 
(137
)
 
(215
)
 
3

 
(79
)
Deferred
37

 
50,143

 
—

Benefit (provision) for income taxes
$
(178
)
 
$
50,146

 
$
(79
)
Schedule of effective income tax rate reconciliation
The (provision) benefit for income taxes results in effective tax rates which are different than the federal income tax statutory rate. A reconciliation of the differences for the years ended December 31, 2014, 2013, and 2012 is as follows (dollars in thousands):
 
2014
 
2013
 
2012
Expected federal income tax credit at statutory rates
$
(1,370
)
 
$
(238
)
 
$
(2,050
)
State income taxes, net of federal effect
(179
)
 
(33
)
 
(263
)
Effect of nontaxable income, net
489

 
547

 
583

Valuation allowance for deferred tax assets
—

 
—

 
10,762

Reversal of valuation allowance
—

 
41,632

 
—

Section 382 impairment re-evaluation
—

 
8,163

 
(8,163
)
Tax affected disallowed merger costs
(974
)
 
—

 
—

Rate change for deferred taxes
1,687

 
52

 
(814
)
Other, net
169

 
23

 
(134
)
Benefit (provision) for income taxes
$
(178
)
 
$
50,146

 
$
(79
)
Schedule of deferred tax assets and liabilities
The significant components of the net deferred tax assets and liabilities at December 31, 2014 and 2013 were as follows (dollars in thousands):
 
2014
 
2013
Deferred tax assets:
 
 
 
Reserve for loan losses and unfunded loan commitments
$
9,920

 
$
8,530

Deferred benefit plan expenses, net
11,942

 
8,700

Federal and state net operating loss and other carryforwards
39,532

 
33,823

Tax credit carryforwards
1,397

 
1,112

Allowance for losses on OREO
928

 
2,167

Accrued interest on non-accrual loans
2,240

 
231

Purchased intangibles
6,580

 
86

Fair value of acquired assets/liabilities
2,849

 
—

Net unrealized loss on investment securities available-for-sale
—

 
21

Other
793

 
284

Deferred tax assets
76,181

 
54,954

Valuation allowance for deferred tax assets
(78
)
 
(74
)
Deferred tax assets, net of valuation allowance
76,103

 
54,880

Deferred tax liabilities:
 
 
 
Accumulated depreciation and amortization
2,552

 
2,821

Deferred loan fees
(466
)
 
711

FHLB stock dividends
2,289

 
556

Net unrealized gains on investment securities available-for-sale
1,765

 
—

Purchased intangibles
2,885

 
—

Other
952

 
724

Deferred tax liabilities
9,977

 
4,812

Net deferred tax assets (liabilities)
$
66,126

 
$
50,068