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Loans and Allowance for Loan Losses - Non Accrual Loans and Loans Past Due 90 Days Or More and Still Accruing (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
item
Mar. 31, 2017
USD ($)
item
Dec. 31, 2017
USD ($)
Loan portfolio past due loans      
Nonaccrual $ 3,808   $ 2,548
Total Loans Greater than 90 Days & Accruing 1,091   592
Troubled debt restructurings, value $ 0 $ 0  
Number of troubled debt restructuring | item 0 0  
Residential loans in process of foreclosure, value $ 0   0
Mortgage warehouse lines of credit      
Loan portfolio past due loans      
Nonaccrual 933    
Residential real estate      
Loan portfolio past due loans      
Nonaccrual 258   60
Total Loans Greater than 90 Days & Accruing 714   475
Multi-family and healthcare financing      
Loan portfolio past due loans      
Total Loans Greater than 90 Days & Accruing 116    
Commercial and commercial real estate      
Loan portfolio past due loans      
Nonaccrual 2,169   2,060
Total Loans Greater than 90 Days & Accruing 136    
Agricultural production and real estate      
Loan portfolio past due loans      
Nonaccrual 282   282
Total Loans Greater than 90 Days & Accruing 117   117
Consumer and margin loans      
Loan portfolio past due loans      
Nonaccrual 166   $ 146
Total Loans Greater than 90 Days & Accruing $ 8