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Loans and Allowance for Credit Losses TDRs by Class Segment (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
loans
Mar. 31, 2018
USD ($)
loans
Financing Receivable, Modifications [Line Items]    
Post-Modification Recorded Investment $ 4,206 $ 10,748
Number of Loans | loans 20 29
Number of Loans | loans 29 32
Recorded Investment $ 3,713 $ 3,522
Real estate - residential mortgage    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loans 2 5
Recorded Investment $ 299 $ 332
Real-estate - commercial mortgage    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0 1
Recorded Investment $ 0 $ 180
Real-estate - home equity    
Financing Receivable, Modifications [Line Items]    
Post-Modification Recorded Investment $ 829 $ 1,384
Number of Loans | loans 12 19
Number of Loans | loans 24 18
Recorded Investment $ 1,150 $ 1,000
Commercial    
Financing Receivable, Modifications [Line Items]    
Post-Modification Recorded Investment $ 2,460 $ 9,359
Number of Loans | loans 4 9
Number of Loans | loans 3 6
Recorded Investment $ 2,264 $ 526
Construction - other    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loans 0 2
Recorded Investment $ 0 $ 1,484