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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, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 48,176 $ 50,032
Recorded Investment with Allowance 37,069 38,257
Related Allowance 4,792 3,861
Average Recorded Investment 38,590 47,117
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 8,051 7,126
Recorded Investment with Allowance 7,933 6,933
Related Allowance 239 202
Average Recorded Investment 7,662 7,739
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,687 949
Recorded Investment with Allowance 1,422 757
Related Allowance 190 50
Average Recorded Investment 1,615 6,057
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,427 1,789
Recorded Investment with Allowance 2,151 1,545
Related Allowance 183 127
Average Recorded Investment 1,964 1,650
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,629 7,177
Recorded Investment with Allowance 6,350 6,862
Related Allowance 3,081 2,433
Average Recorded Investment 6,529 7,154
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 18,389 18,507
Recorded Investment with Allowance 10,842 10,977
Related Allowance 931 881
Average Recorded Investment 10,944 12,140
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 781 928
Recorded Investment with Allowance 672 829
Related Allowance 149 131
Average Recorded Investment 691 846
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 659 710
Recorded Investment with Allowance 455 490
Related Allowance 17 35
Average Recorded Investment 322 481
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 9,553 12,846
Recorded Investment with Allowance 7,244 9,864
Related Allowance 2 2
Average Recorded Investment $ 8,863 $ 11,050