Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Balance of Unamortized Intangible Assets (goodwill)

For intangible assets related to business combinations, the following is a summary of the changes in the balance of unamortized intangible assets (goodwill) during the years ended December 31, 2012, 2011 and 2010:

(dollars in thousands)	For the Twelve Months Ended December 31,
	2012		2011		2010
Gross balance at beginning of year	$	3,905	$	—	$	—
Accumulated impairment balance beginning of year	—		—		—
Effect of Granite merger	300		3,905		—
Impairment	—		—		—
Accumulated balance at end of year	$	4,205	$	3,905	$	—

Changes in Original Carrying Amount of Amortized Intangible Assets

For intangible assets related to business combinations, the following is a summary of the changes in the original carrying amount of amortized intangible assets during the years ended December 31, 2012, 2011 and 2010:

(dollars in thousands)	For the Twelve Months Ended December 31,
	2012		2011		2010
Balance at the beginning of the period	$	13,102	$	8,202	$	8,202
Effect of Granite merger	—		4,900		—
Impairment	—		—		—
Balance at the end of the period	$	13,102	$	13,102	$	8,202

For intangible assets related to business combinations, the following is a summary of the gross carrying amount and accumulated amortization of amortized intangible assets and the carrying amount of unamortized intangible assets:

(dollars in thousands)	As of December 31,
	2012		2011
Core deposit premium related to whole bank acquisitions:
Carrying amount	$	13,102	$	13,102
Accumulated amortization	6,332		4,925
Net core deposit premium	$	6,770	$	8,177

Estimated Amortization Expense for Intangible Assets

The following table presents the estimated amortization expense for intangible assets for each of the five calendar years ending December 31, 2017 and the estimated amount amortizable thereafter. These estimates are subject to change in future periods to the extent management determines it is necessary to make adjustments to the carrying value or estimated useful lives of amortized intangible assets.

(dollars in thousands)	Estimated Amortization Expense
2013	$	1,407
2014	1,407
2015	1,386
2016	834
2017	612
Thereafter	1,123
Total	$	6,769