Loans and Allowance for Credit Losses TDRs by Class Segment (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($) loans	Mar. 31, 2015 USD ($) loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts \| loans	21	25
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 1,581	$ 12,477
Real-estate - home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts \| loans	14	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 1,039	$ 816
Real-estate - residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts \| loans	3	8
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 260	$ 748
Real-estate commercial mortage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts \| loans	3	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 235	$ 1,659
Commercial - Secured [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts \| loans	1	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 47	$ 7,888
Construction - Commercial Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts \| loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment \| $	$ 0	$ 1,366

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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