Premises and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Bank premises and equipment
Premises and Equipment, Gross	$ 151,374	$ 110,761
Accumulated depreciation	(49,849)	(44,009)
Premises and equipment, net	101,525	66,752
Premises
Bank premises and equipment
Premises and Equipment, Gross	109,570	75,106
Leasehold improvements
Bank premises and equipment
Premises and Equipment, Gross	6,185	6,426
Furniture and equipment
Bank premises and equipment
Premises and Equipment, Gross	26,315	22,344
Computer equipment
Bank premises and equipment
Premises and Equipment, Gross	9,033	6,664
Autos
Bank premises and equipment
Premises and Equipment, Gross	$ 271	$ 221

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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