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Loans and Leases - Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related reserve, Recorded Investment $ 27,454 $ 42,169
Impaired loans with a reserve recorded, Recorded Investment 1,028 1,746
Impaired loans with no related reserve, Unpaid Principal Balance 30,882 45,278
Impaired loans with a reserve recorded, Unpaid Principal Balance 1,030 1,868
Total impaired loans, Recorded Investment 28,482  
Total impaired loans, Unpaid Principal Balance 31,912 47,146
Impaired Financing Receivable, Related Allowance 131 235
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related reserve, Recorded Investment 7,019 10,911
Impaired loans with a reserve recorded, Recorded Investment 60 166
Impaired loans with no related reserve, Unpaid Principal Balance 8,301 12,561
Impaired loans with a reserve recorded, Unpaid Principal Balance 60 166
Total impaired loans, Recorded Investment 7,079 11,077
Total impaired loans, Unpaid Principal Balance 8,361 12,727
Impaired Financing Receivable, Related Allowance 31 19
Real Estate-Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related reserve, Recorded Investment 15,621 24,469
Impaired loans with a reserve recorded, Recorded Investment 933 597
Impaired loans with no related reserve, Unpaid Principal Balance 16,507 25,342
Impaired loans with a reserve recorded, Unpaid Principal Balance 933 597
Total impaired loans, Recorded Investment 16,554 25,066
Total impaired loans, Unpaid Principal Balance 17,440 25,939
Impaired Financing Receivable, Related Allowance 99 25
Real Estate-Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related reserve, Recorded Investment 365 0
Impaired loans with no related reserve, Unpaid Principal Balance 365 0
Total impaired loans, Recorded Investment 365 0
Total impaired loans, Unpaid Principal Balance 365 0
Impaired Financing Receivable, Related Allowance 0 0
Real Estate-Residential Secured for Business Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related reserve, Recorded Investment 3,430 5,704
Impaired loans with a reserve recorded, Recorded Investment 35 983
Impaired loans with no related reserve, Unpaid Principal Balance 4,620 6,253
Impaired loans with a reserve recorded, Unpaid Principal Balance 37 1,105
Total impaired loans, Recorded Investment 3,465 6,687
Total impaired loans, Unpaid Principal Balance 4,657 7,358
Impaired Financing Receivable, Related Allowance 1 191
Real Estate-Residential Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related reserve, Recorded Investment 508 560
Impaired loans with no related reserve, Unpaid Principal Balance 566 594
Total impaired loans, Recorded Investment 508 560
Total impaired loans, Unpaid Principal Balance 566 594
Impaired Financing Receivable, Related Allowance 0 0
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related reserve, Recorded Investment 511 525
Impaired loans with no related reserve, Unpaid Principal Balance 523 528
Total impaired loans, Recorded Investment 511 525
Total impaired loans, Unpaid Principal Balance 523 528
Impaired Financing Receivable, Related Allowance $ 0 $ 0