Branch Acquisition (Details) (Branch Acquisition [Member], USD $) In Thousands, unless otherwise specified	Oct. 26, 2012
Branch Acquisition [Member]
Business Acquisition [Line Items]
Number of full-service branches acquired	15
Purchase price of branches acquired, less premium received upon sale of one branch	$ 12,000
Premium received upon sale of branch	3,300
Estimated fair values of assets acquired and liabilities assumed:
Cash and cash equivalents	267,689	[1]
Loans	5,664
Premises and equipment	5,177
Core deposit intangible	2,856
Other assets	45
Total assets acquired	281,431
Deposits	(287,559)
Other liabilities	(54)
Total liabilities acquired	(287,613)
Goodwill	6,182
Business acquisition, premium paid	8,700
Gross performing commercial loans acquired in business acquisition	6,000
Fair value mark recognized on commercial loans acquired in business acquisition	317
Gross deposits assumed in business acquisition	286,700
Fair value mark recognized on deposits assumed in business acquisition	900
Direct costs related to acquisition, expensed as incurred	$ 2,300

[1] Amount is net of $8.7 million deposit premium paid.