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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2013
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense
Income tax expense consists of the following:
Year ended December 31,
2013
 
2012
 
2011
Current:
 
 
 
 
 
Federal
$
30,757

 
$
18,458

 
$
16,451

State
4,533

 
2,818

 
2,759

Total current
35,290

 
21,276

 
19,210

Deferred:
 
 
 
 
 
Federal
10,056

 
7,697

 
2,131

State
1,220

 
1,065

 
274

Total deferred
11,276

 
8,762

 
2,405

Total income tax expense
$
46,566

 
$
30,038

 
$
21,615

Schedule of Effective Income Tax Rate Reconciliation
Total income tax expense differs from the amount computed by applying the statutory federal income tax rate of 35 percent in 2013, 2012 and 2011 to income before income taxes as a result of the following:
Year ended December 31,
2013
 
2012
 
2011
Tax expense at the statutory tax rate
$
46,446

 
$
30,892

 
$
23,156

Increase (decrease) in tax resulting from:
 
 
 
 
 
Tax-exempt income
(3,620
)
 
(3,498
)
 
(3,578
)
State income tax, net of federal income tax benefit
3,741

 
2,524

 
1,972

Other, net
(1
)
 
120

 
65

Tax expense at effective tax rate
$
46,566

 
$
30,038

 
$
21,615

Schedule of Deferred Tax Assets and Liabilities
The tax effects of temporary differences between the financial statement carrying amounts and tax bases of assets and liabilities that give rise to significant portions of the net deferred tax asset (liability) relate to the following:
December 31,
2013
 
2012
Deferred tax assets:
 
 
 
Loans, principally due to allowance for loan losses
$
30,903

 
$
38,688

Investment securities, unrealized losses
9,473

 

Employee benefits
6,813

 
7,041

Other real estate owned write-downs and carrying costs
4,731

 
6,850

Deferred gain on sale of subsidiary
484

 
750

Deferred revenue on contract
545

 

Other
299

 
385

Deferred tax assets
53,248

 
53,714

Deferred tax liabilities:
 
 
 
Fixed assets, principally differences in bases and depreciation
(4,227
)
 
(4,711
)
Investment securities, unrealized gains

 
(11,360
)
Investment in joint venture partnership, principally due to differences in depreciation of partnership assets
(700
)
 
(782
)
Prepaid amounts
(1,247
)
 
(1,052
)
Government agency stock dividends
(1,965
)
 
(2,060
)
Goodwill and core deposit intangibles
(28,167
)
 
(25,815
)
Mortgage servicing rights
(4,337
)
 
(4,418
)
Other
(451
)
 
(919
)
Deferred tax liabilities
(41,094
)
 
(51,117
)
Net deferred tax assets
$
12,154

 
$
2,597