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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 56,964 $ 49,391
Recorded Investment with Allowance 45,150 39,688
Related Allowance 5,530 5,647
Average Recorded Investment 47,054 35,181
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 8,187 2,011
Recorded Investment with Allowance 8,063 1,945
Related Allowance 353 141
Average Recorded Investment 7,877 1,858
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 8,262 10,323
Recorded Investment with Allowance 7,753 10,240
Related Allowance 333 496
Average Recorded Investment 8,678 3,975
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,842 1,745
Recorded Investment with Allowance 1,634 1,542
Related Allowance 145 146
Average Recorded Investment 1,746 1,440
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,762 5,837
Recorded Investment with Allowance 6,507 5,549
Related Allowance 2,310 2,135
Average Recorded Investment 6,678 5,258
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 19,458 18,101
Recorded Investment with Allowance 12,065 11,158
Related Allowance 2,234 2,412
Average Recorded Investment 13,359 11,131
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 897 545
Recorded Investment with Allowance 825 514
Related Allowance 108 127
Average Recorded Investment 818 541
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 772 6,092
Recorded Investment with Allowance 558 5,595
Related Allowance 43 178
Average Recorded Investment 456 7,439
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,784 4,737
Recorded Investment with Allowance 7,745 3,145
Related Allowance 4 12
Average Recorded Investment $ 7,442 $ 3,539