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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 61,070 $ 49,391
Recorded Investment with Allowance 49,727 39,688
Related Allowance 6,279 5,647
Average Recorded Investment 47,638 35,181
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,718 2,011
Recorded Investment with Allowance 7,636 1,945
Related Allowance 301 141
Average Recorded Investment 7,387 1,858
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 9,881 10,323
Recorded Investment with Allowance 9,633 10,240
Related Allowance 521 496
Average Recorded Investment 9,730 3,975
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,252 1,745
Recorded Investment with Allowance 2,047 1,542
Related Allowance 155 146
Average Recorded Investment 1,819 1,440
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,724 5,837
Recorded Investment with Allowance 7,417 5,549
Related Allowance 2,445 2,135
Average Recorded Investment 6,920 5,258
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 20,876 18,101
Recorded Investment with Allowance 13,639 11,158
Related Allowance 2,662 2,412
Average Recorded Investment 13,048 11,131
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 794 545
Recorded Investment with Allowance 755 514
Related Allowance 136 127
Average Recorded Investment 780 541
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 760 6,092
Recorded Investment with Allowance 525 5,595
Related Allowance 55 178
Average Recorded Investment 1,084 7,439
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 11,065 4,737
Recorded Investment with Allowance 8,075 3,145
Related Allowance 4 12
Average Recorded Investment $ 6,870 $ 3,539