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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, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 51,724 $ 50,032
Recorded Investment with Allowance 40,244 38,257
Related Allowance 4,084 3,861
Average Recorded Investment 40,398 47,117
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,730 7,126
Recorded Investment with Allowance 7,619 6,933
Related Allowance 228 202
Average Recorded Investment 7,362 7,739
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,976 949
Recorded Investment with Allowance 1,722 757
Related Allowance 212 50
Average Recorded Investment 1,247 6,057
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,871 1,789
Recorded Investment with Allowance 1,619 1,545
Related Allowance 143 127
Average Recorded Investment 1,618 1,650
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,153 7,177
Recorded Investment with Allowance 6,854 6,862
Related Allowance 2,478 2,433
Average Recorded Investment 7,024 7,154
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 18,769 18,507
Recorded Investment with Allowance 11,120 10,977
Related Allowance 857 881
Average Recorded Investment 10,976 12,140
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 767 928
Recorded Investment with Allowance 660 829
Related Allowance 133 131
Average Recorded Investment 724 846
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 694 710
Recorded Investment with Allowance 422 490
Related Allowance 31 35
Average Recorded Investment 369 481
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 12,764 12,846
Recorded Investment with Allowance 10,228 9,864
Related Allowance 2 2
Average Recorded Investment $ 11,078 $ 11,050