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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Accumulated amortization of intangible assets
 
March 31, 2012
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Core deposit intangibles
$
16,759

 
$
(9,246
)
 
$
7,513

Non-compete covenant
102

 
(70
)
 
32

Lease intangible
618

 
(407
)
 
211

 
$
17,479

 
$
(9,723
)
 
$
7,756

 
 
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 covenant
618

 
(360
)
 
258

 
$
17,479

 
$
(9,240
)
 
$
8,239

 
 
March 31, 2011
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Core deposit intangibles
$
16,760

 
$
(7,360
)
 
$
9,400

Non-compete covenant
102

 
(32
)
 
70

Lease covenant
617

 
(219
)
 
398

 
$
17,479

 
$
(7,611
)
 
$
9,868