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Loans and Allowance for Loan Losses - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]          
Recorded balance of PCI loans $ 73,651,000   $ 73,651,000   $ 88,835,000
Accretion of interest income     5,745,000 $ 3,545,000  
Non-accrual loans 2,829,000   2,829,000   3,205,000
Recorded investment in troubled debt restructurings 7,679,000   7,679,000   8,604,000
Allocation to specific reserves 66,000   66,000   172,000
Commitments to lend additional amounts to customers 0   0   2,000
Payment default for loans modified as troubled debt restructurings     0 0  
Purchased Credit Impaired          
Financing Receivable Recorded Investment Past Due [Line Items]          
Recorded balance of PCI loans 73,651,000   73,651,000   88,835,000
Purchase accounting liquidity discount     3,626,000    
Purchase accounting nonaccretable credit discount     4,579,000    
Accretion of interest income 2,103,000 $ 1,646,000 6,943,000 3,258,000  
Total purchase accounting contribution through accretion for purchased loans 2,130,000 $ 1,537,000 5,745,000 $ 3,545,000  
Non-accrual loans 0   0   0
Non-Purchased Credit Impaired          
Financing Receivable Recorded Investment Past Due [Line Items]          
Purchase accounting liquidity discount     2,637,000    
Purchase accounting accretable credit discount     8,393,000    
Federal Reserve | Borrower in Custody Program          
Financing Receivable Recorded Investment Past Due [Line Items]          
Gross loans 1,313,796,000   1,313,796,000   724,312,000
Federal Home Loan Bank of Cincinnati | Qualifying Residential Mortgage Loans          
Financing Receivable Recorded Investment Past Due [Line Items]          
Gross loans 700,639,000   700,639,000   761,197,000
Federal Home Loan Bank of Cincinnati | Qualifying Commercial Mortgage Loans          
Financing Receivable Recorded Investment Past Due [Line Items]          
Gross loans $ 580,651,000   $ 580,651,000   $ 207,370,000