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Securities (Additional Information) (Details)
12 Months Ended
Dec. 31, 2009
USD ($)
Jun. 30, 2019
USD ($)
investment
Dec. 31, 2018
USD ($)
investment
Debt Securities, Available-for-sale [Line Items]      
Carrying value of securities pledged to secure repurchase agreements, public and trust deposits and other by law   $ 204,067,000 $ 211,239,000
Original amount in non-controlling investment security in a single banking organization   353,000 $ 353,000
Additional impairment on equity securities recognized through earnings   $ 0  
Equity Securities      
Debt Securities, Available-for-sale [Line Items]      
Number of non-controlling investments in a single banking organization | investment   1 1
Original amount in non-controlling investment security in a single banking organization $ 1,350,000    
Other than temporary impairment loss recognized in earnings, non-controlling investment in single banking organization $ 997,000