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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 50,032 $ 49,391
Recorded Investment with Allowance 38,257 39,688
Related Allowance 3,861 5,647
Average Recorded Investment 47,117 35,181
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,126 2,011
Recorded Investment with Allowance 6,933 1,945
Related Allowance 202 141
Average Recorded Investment 7,739 1,858
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 949 10,323
Recorded Investment with Allowance 757 10,240
Related Allowance 50 496
Average Recorded Investment 6,057 3,975
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,789 1,745
Recorded Investment with Allowance 1,545 1,542
Related Allowance 127 146
Average Recorded Investment 1,650 1,440
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,177 5,837
Recorded Investment with Allowance 6,862 5,549
Related Allowance 2,433 2,135
Average Recorded Investment 7,154 5,258
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 18,507 18,101
Recorded Investment with Allowance 10,977 11,158
Related Allowance 881 2,412
Average Recorded Investment 12,140 11,131
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 928 545
Recorded Investment with Allowance 829 514
Related Allowance 131 127
Average Recorded Investment 846 541
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 710 6,092
Recorded Investment with Allowance 490 5,595
Related Allowance 35 178
Average Recorded Investment 481 7,439
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 12,846 4,737
Recorded Investment with Allowance 9,864 3,145
Related Allowance 2 12
Average Recorded Investment $ 11,050 $ 3,539