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Premises and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment Line Items
Property Plant And Equipment Gross	$ 130,582,000	$ 127,078,000
Accumulated depreciation and amortization	(60,175,000)	(52,488,000)
Total Premises and Equipment, net	70,407,000	74,590,000
Land And Land Improvements
Property Plant And Equipment Line Items
Property Plant And Equipment Gross	$ 5,638,000	$ 5,638,000
Land And Land Improvements | Minimum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	0 years	0 years
Land And Land Improvements | Maximum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	0 years	0 years
Building And Building Improvements
Property Plant And Equipment Line Items
Property Plant And Equipment Gross	$ 64,048,000	$ 64,392,000
Building And Building Improvements | Minimum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	0 years	0 years
Building And Building Improvements | Maximum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	40 years	40 years
Leasehold Improvements
Property Plant And Equipment Line Items
Property Plant And Equipment Gross	$ 20,414,000	$ 20,166,000
Leasehold Improvements | Minimum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	5 years	5 years
Leasehold Improvements | Maximum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	10 years	10 years
Furniture And Fixtures
Property Plant And Equipment Line Items
Property Plant And Equipment Gross	$ 14,479,000	$ 13,656,000
Furniture And Fixtures | Minimum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	3 years	3 years
Furniture And Fixtures | Maximum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	7 years	7 years
Software And Software Development Costs
Property Plant And Equipment Line Items
Property Plant And Equipment Gross	$ 26,003,000	$ 23,226,000
Software And Software Development Costs | Minimum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	3 years	3 years
Software And Software Development Costs | Maximum [Member]
Property Plant And Equipment Line Items
Property Plant And Equipment Useful Life	7 years	7 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-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 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

Reference 1: 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 2: 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 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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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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