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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 54,328 $ 50,032
Recorded Investment with Allowance 49,974 38,257
Related Allowance 5,374 3,861
Average Recorded Investment 41,637 47,117
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 12,817 7,126
Recorded Investment with Allowance 12,566 6,933
Related Allowance 450 202
Average Recorded Investment 9,352 7,739
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 3,873 949
Recorded Investment with Allowance 3,593 757
Related Allowance 279 50
Average Recorded Investment 2,501 6,057
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 3,060 1,789
Recorded Investment with Allowance 2,768 1,545
Related Allowance 254 127
Average Recorded Investment 2,422 1,650
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,752 7,177
Recorded Investment with Allowance 7,483 6,862
Related Allowance 3,264 2,433
Average Recorded Investment 6,801 7,154
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 11,853 18,507
Recorded Investment with Allowance 11,237 10,977
Related Allowance 923 881
Average Recorded Investment 11,131 12,140
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 959 928
Recorded Investment with Allowance 826 829
Related Allowance 108 131
Average Recorded Investment 718 846
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 4,917 710
Recorded Investment with Allowance 4,708 490
Related Allowance 94 35
Average Recorded Investment 424 481
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,108 12,846
Recorded Investment with Allowance 4,603 9,864
Related Allowance 2 2
Average Recorded Investment 7,199 $ 11,050
Pegasus Bank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,989  
Recorded Investment with Allowance 2,190  
Average Recorded Investment $ 1,089