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Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
loans
Sep. 30, 2018
USD ($)
loans
Sep. 30, 2019
USD ($)
loans
Sep. 30, 2018
USD ($)
loans
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 17 30 66 90
Post-Modification Recorded Investment | $ $ 1,335 $ 2,512 $ 9,553 $ 15,049
Commercial        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 3 2 13 13
Post-Modification Recorded Investment | $ $ 97 $ 913 $ 4,928 $ 10,325
Real-estate - commercial mortgage        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 0 1 0
Post-Modification Recorded Investment | $ $ 81 $ 0 $ 81 $ 0
Real-estate - home equity        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 12 24 46 71
Post-Modification Recorded Investment | $ $ 327 $ 1,002 $ 2,281 $ 4,045
Residential Mortgage [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | loans 1 4 6 6
Post-Modification Recorded Investment | $ $ 830 $ 597 $ 2,263 $ 679