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Loans - Recorded Investment of Individual Loan Categories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance $ 2,851,359 $ 2,825,702    
Net loans 2,834,885 2,809,308    
Interest Due 8,476 9,226    
Deferred Fees / (Costs) 5,434 6,293    
Recorded Investment 2,865,269 2,841,221    
Recorded Investment 2,848,795 2,824,827    
Allowance for Loan Losses (16,474) (16,394) $ (15,054) $ (14,837)
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 1,651,355 1,664,067    
Interest Due 4,700 5,401    
Deferred Fees / (Costs) 5,019 5,661    
Recorded Investment 1,661,074 1,675,129    
Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 717,170 698,893    
Interest Due 2,260 2,295    
Deferred Fees / (Costs) 2,260 2,375    
Recorded Investment 721,690 703,563    
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 482,834 462,742    
Interest Due 1,516 1,530    
Deferred Fees / (Costs) (1,845) (1,743)    
Recorded Investment 482,505 462,529    
Owner Occupied Real Estate [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 581,696 571,982    
Interest Due 1,247 1,511    
Deferred Fees / (Costs) 1,825 1,917    
Recorded Investment 584,768 575,410    
Non Owner Occupied Real Estate [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 677,932 678,945    
Interest Due 1,022 1,138    
Deferred Fees / (Costs) 2,173 2,478    
Recorded Investment 681,127 682,561    
Residential Spec Homes [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 17,473 16,431    
Interest Due 53 63    
Deferred Fees / (Costs) 80 80    
Recorded Investment 17,606 16,574    
Development & Spec Land [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 33,736 48,838    
Interest Due 77 117    
Deferred Fees / (Costs) 497 579    
Recorded Investment 34,310 49,534    
Commercial and Industrial [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 340,518 347,871    
Interest Due 2,301 2,572    
Deferred Fees / (Costs) 444 607    
Recorded Investment 343,263 351,050    
Residential Mortgage [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 595,424 588,358    
Interest Due 1,742 1,776    
Deferred Fees / (Costs) 2,260 2,375    
Recorded Investment 599,426 592,509    
Residential Construction [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 20,447 16,027    
Interest Due 38 39    
Recorded Investment 20,485 16,066    
Mortgage Warehousing [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 101,299 94,508    
Interest Due 480 480    
Recorded Investment 101,779 94,988    
Direct Installment [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 37,414 37,841    
Interest Due 98 113    
Deferred Fees / (Costs) (552) (552)    
Recorded Investment 36,960 37,402    
Indirect Installment [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 250,925 227,323    
Interest Due 542 528    
Deferred Fees / (Costs) 163 168    
Recorded Investment 251,630 228,019    
Home Equity Loan [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan Balance 194,495 197,578    
Interest Due 876 889    
Deferred Fees / (Costs) (1,456) (1,359)    
Recorded Investment $ 193,915 $ 197,108