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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 10,455 $ 19,597 $ 2,898
State 1,351 1,366 2,069
Total current tax expense 11,806 20,963 4,967
Deferred:      
Federal 3,161 (9,798) 23,211
State 161 (403) 768
Total deferred tax expense (benefit) 25,086 (10,201) 23,979
Provision for income taxes 15,128 10,762 28,946
Federal statutory income tax rate (as a percent) 35.00%    
Difference between the provision for income taxes and taxes computed by applying the federal statutory income tax rate to income before provision for income taxes      
Income taxes at federal statutory rate 15,806 11,675 28,290
Increase (reduction) of taxes resulting from:      
State income taxes, net of federal tax benefit 983 626 1,844
Tax-exempt interest (1,436) (821) (834)
Income tax credits (571) (584) (584)
Dividends received deduction (3) (3) (2)
Other, net 349 (131) 232
Provision for income taxes 15,128 10,762 28,946
Components of the net deferred tax asset      
Allowance for loan losses 16,597 18,244  
Other-than-temporary impairment on securities 1,196 120  
Share-based compensation 854 785  
Pension plan and post-retirement benefits 2,067 2,557  
Deferred compensation 2,572 664  
Purchase accounting adjustments 42,815 216  
Other real estate owned 8,214 2,303  
Tax deductible goodwill 1,060    
Net operating loss carryforwards 6,870 1,138  
Cash flow hedge 572    
Other 921 673  
Total deferred tax assets 83,738 26,700  
Gain on FDIC assisted transaction deferred for tax purposes 27,075 17,080  
Unrealized gains on investment securities available for sale 5,294 3,579  
Depreciation 3,556 3,265  
Intangible assets 7,649 1,483  
Deferred loan fees 1,740 1,935  
Prepaid expense 295 689  
Other 2,969 211  
Total deferred tax liabilities 48,578 28,242  
Net deferred tax asset (liability) before valuation allowance 35,160 (1,542)  
Less, valuation allowance (1,259) (1,138)  
Net deferred tax asset (liability) $ 33,901 $ (2,680)