Fair Value Measurements - Textual (Details) - USD ($)	3 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Fair Value Measurements (Textual) [Abstract]
Impairment of goodwill	$ 0	$ 0
Core deposit intangible assets
Fair Value Measurements (Textual) [Abstract]
Impairment valuation allowance	0
Impairment identified for intangible assets		0
Loan servicing rights
Fair Value Measurements (Textual) [Abstract]
Impairment valuation allowance	$ 8,000	0
Minimum
Fair Value Measurements (Textual) [Abstract]
Expected life of intangible assets	10 years
Maximum
Fair Value Measurements (Textual) [Abstract]
Expected life of intangible assets	15 years
Loans Held For Sale
Fair Value Measurements (Textual) [Abstract]
Loans held for sale that were on nonaccrual status	$ 0	0
Loans held for sale that were 90 days past due and on accrual status	$ 0	0
Total Impaired Loans \| Minimum
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	10.00%
Total Impaired Loans \| Maximum
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	25.00%
Other Real Estate and Repossessed Assets \| Minimum
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	10.00%
Other Real Estate and Repossessed Assets \| Maximum
Fair Value Measurements (Textual) [Abstract]
Percentage of discount factors used to determine fair value	25.00%
Measured on a Recurring Basis
Fair Value Measurements (Textual) [Abstract]
Liabilities recorded at fair value	$ 8,918,000	6,359,000
Measured on a Nonrecurring Basis
Fair Value Measurements (Textual) [Abstract]
Liabilities recorded at fair value	0	0
Total assets measured at fair value on a nonrecurring basis	65,420,000	63,572,000
Measured on a Nonrecurring Basis \| Impaired originated loans
Fair Value Measurements (Textual) [Abstract]
Total assets measured at fair value on a nonrecurring basis	$ 63,180,000	62,184,000
Measured on a Nonrecurring Basis \| Loan servicing rights
Fair Value Measurements (Textual) [Abstract]
Total assets measured at fair value on a nonrecurring basis		$ 2,000

Fair value measurements.

No definition available.

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- Definition

Intangible Asset, Impaired, Accumulated Impairment Loss

+ References

No definition available.

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- Definition

Percentage of discount factors used to determine fair value.

+ References

No definition available.

+ Details

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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- Definition

This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

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- Definition

This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a,h)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122739-111746

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