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Regulatory Capital Requirements - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 15, 2017
Dec. 31, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Shelf registration shares after amendment   1,500,000  
Maximum stock issuable under stock purchase and dividend reinvestment plan   $ 120  
Stock repurchased during period (in shares)   149,284 0
RBPI      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Number of shares issued 3,101,316    
Common shares issued (3,101,316) $ 136,800    
Dividend Reinvestment and Share Purchase Plan      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Stock issued during period, shares     0