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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 59,562 $ 49,391
Recorded Investment with Allowance 48,301 39,688
Related Allowance 6,023 5,647
Average Recorded Investment 44,187 35,181
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,580 2,011
Recorded Investment with Allowance 7,507 1,945
Related Allowance 296 141
Average Recorded Investment 5,944 1,858
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,137 10,323
Recorded Investment with Allowance 9,941 10,240
Related Allowance 532 496
Average Recorded Investment 10,023 3,975
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,118 1,745
Recorded Investment with Allowance 1,918 1,542
Related Allowance 138 146
Average Recorded Investment 1,835 1,440
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,906 5,837
Recorded Investment with Allowance 6,611 5,549
Related Allowance 2,372 2,135
Average Recorded Investment 6,241 5,258
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 19,526 18,101
Recorded Investment with Allowance 12,407 11,158
Related Allowance 2,448 2,412
Average Recorded Investment 11,705 11,131
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 850 545
Recorded Investment with Allowance 817 514
Related Allowance 134 127
Average Recorded Investment 783 541
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,991 6,092
Recorded Investment with Allowance 2,608 5,595
Related Allowance 99 178
Average Recorded Investment 2,570 7,439
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 9,454 4,737
Recorded Investment with Allowance 6,492 3,145
Related Allowance 4 12
Average Recorded Investment $ 5,086 $ 3,539