Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($) loans	Jun. 30, 2017 USD ($) loans	Jun. 30, 2018 USD ($) loans	Jun. 30, 2017 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	31	39	60	70
Post-Modification Recorded Investment \| $	$ 1,789	$ 7,464	$ 12,537	$ 13,160
Extend maturity without rate concession \| Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	1	5	5	8
Post-Modification Recorded Investment \| $	$ 49	$ 2,600	$ 1,151	$ 5,693
Extend maturity without rate concession \| Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	1	3	6	4
Post-Modification Recorded Investment \| $	$ 4	$ 663	$ 8,261	$ 981
Extend maturity without rate concession \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	23	17	40	33
Post-Modification Recorded Investment \| $	$ 1,346	$ 1,275	$ 2,622	$ 2,559
Extend maturity without rate concession \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	1	0	1	2
Post-Modification Recorded Investment \| $	$ 77	$ 0	$ 77	$ 337
Extend maturity without rate concession \| Construction
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	1	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 1,204	$ 0	$ 1,204
Bankruptcy \| Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	1	0	2
Post-Modification Recorded Investment \| $	$ 0	$ 490	$ 0	$ 523
Bankruptcy \| Real-estate - commercial mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	1	0	1
Post-Modification Recorded Investment \| $	$ 0	$ 12	$ 0	$ 12
Bankruptcy \| Real-estate - home equity
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	5	10	7	17
Post-Modification Recorded Investment \| $	$ 313	$ 1,063	$ 421	$ 1,516
Bankruptcy \| Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans \| loans	0	1	1	2
Post-Modification Recorded Investment \| $	$ 0	$ 157	$ 5	$ 335

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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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