Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017 USD ($) loans	Sep. 30, 2016 USD ($) loans	Sep. 30, 2017 USD ($) loans	Sep. 30, 2016 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	27	42	97	115
Post-Modification Recorded Investment \| $	$ 3,468	$ 3,823	$ 16,628	$ 10,303
Extend maturity without rate concession \| Commercial - secured
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	1	4	9	10
Post-Modification Recorded Investment \| $	$ 160	$ 1,826	$ 5,853	$ 3,802
Extend maturity without rate concession \| Commercial - unsecured
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	1	2
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 33	$ 103
Extend maturity without rate concession \| Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	2	0	6	0
Post-Modification Recorded Investment \| $	$ 1,247	$ 0	$ 2,228	$ 0
Extend maturity without rate concession \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	14	24	47	63
Post-Modification Recorded Investment \| $	$ 1,315	$ 1,063	$ 3,874	$ 3,058
Extend maturity without rate concession \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	2	0	4	2
Post-Modification Recorded Investment \| $	$ 151	$ 0	$ 488	$ 315
Extend maturity without rate concession \| Construction - commercial residential
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	1	0
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 1,204	$ 0
Bankruptcy \| Commercial - secured
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	1	0
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 490	$ 0
Bankruptcy \| Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	1	0
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 12	$ 0
Bankruptcy \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	6	11	23	33
Post-Modification Recorded Investment \| $	$ 127	$ 563	$ 1,643	$ 2,279
Bankruptcy \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	2	2	3
Post-Modification Recorded Investment \| $	$ 0	$ 350	$ 335	$ 723
Bankruptcy \| Consumer - direct
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	0	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 0	$ 0	$ 2
Bankruptcy \| Consumer - indirect
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	1	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 21	$ 0	$ 21

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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