Quarterly report pursuant to Section 13 or 15(d)

Allowance for Loan and Lease Losses - Summary of Information Regarding Impaired Loans Evaluated for Specific Reserves (Details)

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Allowance for Loan and Lease Losses - Summary of Information Regarding Impaired Loans Evaluated for Specific Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable Impaired [Line Items]      
Impaired Loans - With Allowance, Recorded Investment $ 1,833   $ 1,983
Impaired Loans - With Allowance, Unpaid Principal Balance 1,848   2,021
Impaired Loans - With Allowance, Related Allowance 1,169   1,361
Impaired Loans - With no Allowance, Recorded Investment 2,046   2,003
Impaired Loans - With no Allowance, Unpaid Principal Balance 2,224   2,007
Average Recorded Investment 3,919 $ 4,600  
Commercial and Industrial Loans      
Financing Receivable Impaired [Line Items]      
Impaired Loans - With Allowance, Recorded Investment 1,727   1,811
Impaired Loans - With Allowance, Unpaid Principal Balance 1,742   1,850
Impaired Loans - With Allowance, Related Allowance 1,148   1,226
Impaired Loans - With no Allowance, Recorded Investment 155   383
Impaired Loans - With no Allowance, Unpaid Principal Balance 333   386
Average Recorded Investment 1,913 1,940  
Real Estate | 1-4 Single Family Residential Loans      
Financing Receivable Impaired [Line Items]      
Impaired Loans - With Allowance, Recorded Investment     119
Impaired Loans - With Allowance, Unpaid Principal Balance     119
Impaired Loans - With Allowance, Related Allowance     119
Impaired Loans - With no Allowance, Recorded Investment 1,458   1,173
Impaired Loans - With no Allowance, Unpaid Principal Balance 1,458   1,174
Average Recorded Investment 1,463 334  
Real Estate | Commercial Real Estate Loans (Including Multifamily)      
Financing Receivable Impaired [Line Items]      
Impaired Loans - With no Allowance, Recorded Investment 433   447
Impaired Loans - With no Allowance, Unpaid Principal Balance 433   447
Average Recorded Investment 437 2,301  
Consumer Loans and Leases      
Financing Receivable Impaired [Line Items]      
Impaired Loans - With Allowance, Recorded Investment 106   53
Impaired Loans - With Allowance, Unpaid Principal Balance 106   52
Impaired Loans - With Allowance, Related Allowance 21   $ 16
Average Recorded Investment $ 106 $ 25