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Loans and Allowance for Credit Losses TDRs by Class Segment (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
loans
Mar. 31, 2017
USD ($)
loans
Financing Receivable, Modifications [Line Items]    
Post-Modification Recorded Investment $ 10,748 $ 5,696
Number of Loans | loans 29 31
Number of Loans | loans 32 30
Recorded Investment $ 3,522 $ 6,729
Real estate - residential mortgage    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loans 5 8
Recorded Investment $ 332 $ 2,006
Real-estate - commercial mortgage    
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 2
Recorded Investment $ 180 $ 430
Real-estate - home equity    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loans 18 14
Recorded Investment $ 1,000 $ 639
Commercial    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loans 6 6
Recorded Investment $ 526 $ 3,654
Construction - other    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loans 2 0
Recorded Investment $ 1,484 $ 0