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INCOME TAXES: (Tables)
 12 Months Ended
Dec. 31, 2012
Income Tax Disclosure [Abstract]  
Income Tax Expense

Income tax expense is summarized as follows:

 

(Dollar amounts in thousands)   2012     2011     2010  
Federal:                        
Currently payable   $ 12,074     $ 11,872     $ 15,582  
Deferred     (455 )     311       (4,850 )
      11,619       12,183       10,732  
State:                        
Currently payable     1,887       1,901       2,325  
Deferred     312       313       (1,090 )
      2,199       2,214       1,235  
TOTAL   $ 13,818     $ 14,397     $ 11,967  
Reconciliation of Income Tax Expense

The reconciliation of income tax expense with the amount computed by applying the statutory federal income tax rate of 35% to income before income taxes is summarized as follows:

 

 

(Dollar amounts in thousands)   2012     2011     2010  
Federal income taxes computed at the statutory rate   $ 16,320     $ 18,057     $ 14,004  
Add (deduct) tax effect of:                        
Tax exempt income     (3,864 )     (3,875 )     (3,400 )
 ESOP dividend deduction     (258 )     (1,085 )     -  
State tax, net of federal benefit     1,444       1,439       803  
Affordable housing credits     (148 )     (86 )     -  
Other, net     324       (53 )     560  
TOTAL   $ 13,818     $ 14,397     $ 11,967  
Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities at December 31, 2012 and 2011, are as follows:

 

(Dollar amounts in thousands)   2012     2011  
Deferred tax assets:                
Other than temporary impairment   $ 5,951     $ 6,068  
Net unrealized losses on retirement plans     13,612       15,166  
Loan losses provision     8,606       7,803  
Deferred compensation     7,729       8,087  
Compensated absences     888       759  
Post-retirement benefits     2,040       2,016  
Deferred loss on acquisition     136       187  
Other     2,104       1,771  
GROSS DEFERRED ASSETS     41,066       41,857  
                 
Deferred tax liabilities:                
Net unrealized gains on securities available-for-sale     (8,954 )     (8,493 )
Depreciation     (2,715 )     (1,830 )
Mortgage servicing rights     (700 )     (763 )
Pensions     (2,518 )     (3,587 )
Intangibles     (541 )     -  
Other     (1,381 )     (1,055 )
GROSS DEFERRED LIABILITIES     (16,809 )     (15,728 )
NET DEFERRED TAX ASSETS (LIABILITIES)   $ 24,257     $ 26,129  
Reconciliation of Unrecognized Tax Benefits

Unrecognized Tax Benefits — A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

 

(Dollar amounts in thousands)   2012     2011     2010  
Balance at January 1   $ 862     $ 901     $ 660  
Additions based on tax positions related to the current year     86       137       113  
Additions based on tax positions related to prior years     -       -       181  
Reductions due to the statute of limitations     (171 )     (176 )     (53 )
Balance at December 31   $ 777     $ 862     $ 901