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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Allowance for loan losses $ 4,632 $ 4,336
Deferred compensation 1,753 1,542
Impaired security valuation 670 495
Capital loss carryover 278 435
Post-retirement benefits 1,063 826
Unrealized loss on interest rate swap 616 584
Nonaccrual loan interest 305 455
Other 609 515
Deferred Tax Assets 9,926 9,188
Deferred tax liabilities:    
Unrealized gain on securities available for sale 8,636 6,720
Premises and equipment 1,535 1,561
Intangibles - section 197 3,179 2,837
Mortgage servicing rights 250 317
Other 339 308
Deferred Tax Liabilities 13,939 11,743
Net deferred tax liability $ (4,013) $ (2,555)