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Loans - Summary of Holiday's Loan Portfolio Included in Consumer and Residential Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential real estate $ 713,347 $ 652,883
Less: unearned discount (3,889) (3,430)
Consumer Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer 80,193 74,816
Holiday Financial Services Corporation [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residential real estate 0 1,209
Less: unearned discount (3,889) (3,430)
Total 19,539 21,805
Holiday Financial Services Corporation [Member] | Consumer Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Consumer $ 23,428 $ 24,026