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Loans - Summary of Loan Balances (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]            
Commercial $ 3,169,675   $ 3,038,472      
Unamortized net deferred loan fees (9,756)   (8,651)      
Discounts to principal balance of loans owed, net of charge-offs (13,606)   (14,656)      
Total loans, net of unamortized deferred loan fees and discounts 3,146,313   3,015,165 $ 2,826,393    
Allowance for loan losses (29,524) $ (29,973) (30,323) (28,143) $ (31,017) $ (32,503)
Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,401,040   2,300,322 2,106,567    
Allowance for loan losses (13,598) (13,665) (13,758) (12,613) (14,204) (14,265)
Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 350,925   356,874 360,782    
Allowance for loan losses (7,137) (7,718) (8,227) (9,157) (9,576) (10,310)
Commercial Portfolio Segment [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 237,619   220,412 225,743    
Allowance for loan losses (6,378) (6,392) (6,512) (4,729) (5,326) (5,831)
Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 156,729   137,557 133,301    
Allowance for loan losses (2,411) (2,198) (1,826) (1,644) (1,911) (2,097)
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 384,692   385,426 381,305    
Allowance for loan losses (1,991) (2,170) (2,317) (2,511) (2,662) (2,748)
Home Equity Loans [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 40,986   43,031 45,936    
Allowance for loan losses (1,532) (1,736) (1,841) (2,356) (2,451) (2,644)
Other Consumer [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 23,503   25,155 28,370    
Allowance for loan losses (557) (570) (586) (645) (595) (622)
Commercial [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,016,348   1,914,896 1,725,262    
Allowance for loan losses (11,607) (11,495) (11,441) (10,102) (11,542) (11,517)
Commercial [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 83,151   69,627 70,151    
Allowance for loan losses (977) (847) (642) (466) (572) (680)
Home Equity Lines of Credit [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 286,436   288,688 286,476    
Allowance for loan losses (5,048) (5,412) (5,800) (6,156) (6,530) (7,044)
Residential [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 73,578   67,930 63,150    
Allowance for loan losses (1,434) $ (1,351) (1,184) $ (1,178) $ (1,339) $ (1,417)
Originated [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Commercial 2,855,594   2,699,053      
Unamortized net deferred loan fees (9,756)   (8,651)      
Total loans, net of unamortized deferred loan fees and discounts 2,845,838   2,690,402      
Allowance for loan losses (28,761)   (29,122)      
Originated [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,131,979   2,011,032      
Originated [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 329,786   332,649      
Originated [Member] | Commercial Portfolio Segment [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 227,591   209,437      
Originated [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 156,482   137,284      
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 326,149   320,522      
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 38,082   39,848      
Originated [Member] | Other Consumer [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 21,421   22,859      
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 1,805,830   1,690,510      
Originated [Member] | Commercial [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 82,912   69,364      
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 270,283   269,942      
Originated [Member] | Residential [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 73,570   67,920      
PNCI [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Commercial 293,151   316,238      
Discounts to principal balance of loans owed, net of charge-offs (6,537)   (7,035)      
Total loans, net of unamortized deferred loan fees and discounts 286,614   309,203      
Allowance for loan losses (624)   (929)      
PNCI [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 259,746   279,342      
PNCI [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 19,066   21,197      
PNCI [Member] | Commercial Portfolio Segment [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 7,555   8,391      
PNCI [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 247   273      
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 56,823   63,519      
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,449   2,698      
PNCI [Member] | Other Consumer [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,039   2,251      
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 202,923   215,823      
PNCI [Member] | Commercial [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 239   263      
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 14,578   16,248      
PNCI [Member] | Residential [Member] | Construction [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 8   10      
PCI - Cash Basis [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Commercial 4,898   5,863      
Discounts to principal balance of loans owed, net of charge-offs (3,368)   (3,794)      
Total loans, net of unamortized deferred loan fees and discounts 1,530   2,069      
Allowance for loan losses (7)   (17)      
PCI - Cash Basis [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 1,530   2,069      
PCI - Cash Basis [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 1,530   2,069      
PCI - Other [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Commercial 16,032   17,318      
Discounts to principal balance of loans owed, net of charge-offs (3,701)   (3,827)      
Total loans, net of unamortized deferred loan fees and discounts 12,331   13,491      
Allowance for loan losses (132)   (255)      
PCI - Other [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 9,315   9,948      
PCI - Other [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 543   959      
PCI - Other [Member] | Commercial Portfolio Segment [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,473   2,584      
PCI - Other [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 1,720   1,385      
PCI - Other [Member] | Home Equity Loans [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 455   485      
PCI - Other [Member] | Other Consumer [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 43   45      
PCI - Other [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 7,595   8,563      
PCI - Other [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts $ 45   $ 429