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Off-Balance Sheet Loan Commitments - Summary of Financial Instruments with Off-Balance Sheet Risk - (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Standby Letters of Credit    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Financial instruments, off balance sheet risk, fixed rate $ 2,342 $ 1,030
Financial instruments, off balance sheet risk, variable rate 4,182 1,999
Commitments to Make Loans    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Financial instruments, off balance sheet risk, fixed rate 8,985 6,571
Financial instruments, off balance sheet risk, variable rate 12,852 2,949
Unused Lines of Credit    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Financial instruments, off balance sheet risk, fixed rate 100,056 35,514
Financial instruments, off balance sheet risk, variable rate $ 106,090 $ 81,189