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Securities - Narrative (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
investment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loans and Leases Receivable Disclosure [Line Items]      
Proceeds from sale of available-for-sale securities | $ $ 0 $ 0  
Realized gain (loss) | $ 0 $ 0  
Proceeds from call of debt security | $ 5,000,000    
Collateral Pledged [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Restricted securities | $ $ 108,000,000   $ 97,200,000
US Government-sponsored Enterprises Debt Securities [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Number of positions | investment 8    
Municipal securities [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Number of positions | investment 8    
Other debt securities [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Number of positions | investment 1    
Mortgage-backed securities [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Number of positions | investment 68