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Off-Balance Sheet Loan Commitments - Summary of Financial Instruments with Off-Balance Sheet Risk - (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Commitments to Make Loans    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Financial instruments, off balance sheet risk, Fixed Rate $ 40,988 $ 7,345
Financial instruments, off balance sheet risk, Variable Rate 25,500 7,580
Unused Lines of Credit    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Financial instruments, off balance sheet risk, Fixed Rate 105,837 109,611
Financial instruments, off balance sheet risk, Variable Rate 190,451 145,475
Standby Letters of Credit    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Financial instruments, off balance sheet risk, Fixed Rate 1,556 2,547
Financial instruments, off balance sheet risk, Variable Rate $ 11,261 $ 4,706