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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Accumulated amortization of intangible assets
 
September 30, 2012
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Core deposit intangibles
$
16,759

 
$
(10,117
)
 
$
6,642

Non-compete covenant
102

 
(70
)
 
32

Lease intangible
618

 
(475
)
 
143

 
$
17,479

 
$
(10,662
)
 
$
6,817

 
 
December 31, 2011
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Core deposit intangibles
$
16,759

 
$
(8,829
)
 
$
7,930

Non-compete covenant
102

 
(51
)
 
51

Lease intangible
618

 
(360
)
 
258

 
$
17,479

 
$
(9,240
)
 
$
8,239

 
 
September 30, 2011
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Core deposit intangibles
$
16,760

 
$
(8,339
)
 
$
8,421

Non-compete covenant
102

 
(45
)
 
57

Lease intangible
617

 
(313
)
 
304

 
$
17,479

 
$
(8,697
)
 
$
8,782