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Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	$ 122,243	$ 120,572
Less accumulated depreciation and amortization	(75,925)	(72,632)
Premises and equipment, net	46,318	47,940
Depreciation and amortization of premises and equipment	3,900	3,700	$ 3,700
Land and Buildings [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	79,173	78,086
Leasehold Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	4,894	4,886
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	38,096	36,831
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	$ 80	$ 769

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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
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-Topic 360
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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+ 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

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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