Quarterly report pursuant to Section 13 or 15(d)

Allowance for Loan and Lease Losses - Summary of Troubled Debt Restructurings (TDRs) Based Upon Delinquency Status (Details)

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Allowance for Loan and Lease Losses - Summary of Troubled Debt Restructurings (TDRs) Based Upon Delinquency Status (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Contract
Mar. 31, 2017
USD ($)
Contract
Financing Receivable Modifications [Line Items]    
Number of contracts | Contract 12 15
Recorded Investment | $ $ 791 $ 921
Allowance attributable to TDRs | $ $ 247 $ 411
Commercial and Industrial Loans    
Financing Receivable Modifications [Line Items]    
Number of contracts | Contract 5 6
Performing TDRs    
Financing Receivable Modifications [Line Items]    
Number of contracts | Contract 4 5
Recorded Investment | $ $ 205 $ 270
Performing TDRs | Commercial and Industrial Loans    
Financing Receivable Modifications [Line Items]    
Number of contracts | Contract 2 5
Recorded Investment | $ $ 52 $ 270
Performing TDRs | Real Estate | 1-4 Single Family Residential Loans    
Financing Receivable Modifications [Line Items]    
Number of contracts | Contract 2  
Recorded Investment | $ $ 153  
Nonperforming TDRs    
Financing Receivable Modifications [Line Items]    
Number of contracts | Contract 8 10
Recorded Investment | $ $ 586 $ 651