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Loans - Summary of Loan Balances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]            
Total principal balance of loans owed, net of charge-offs $ 4,227,934   $ 4,075,244      
Unamortized net deferred loan fees (8,509)   (9,868)      
Discounts to principal balance of loans owed, net of charge-offs (37,077)   (43,362)      
Total loans, net of unamortized deferred loan fees and discounts 4,182,348   4,022,014 $ 4,027,436    
Allowance for loan losses (31,537) $ (32,868) (32,582) (31,603) $ (29,524) $ (30,323)
Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 3,247,156   3,143,100 3,132,202    
Allowance for loan losses (14,347) (14,675) (15,620) (15,279) (13,598) (13,758)
Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 442,539   418,982 421,285    
Allowance for loan losses (8,549) (8,552) (8,375) (7,514) (7,137) (8,227)
Commercial            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 278,458   276,548 289,647    
Allowance for loan losses (5,687) (6,745) (6,090) (6,224) (6,378) (6,512)
Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 214,195   183,384 184,302    
Allowance for loan losses (2,954) (2,896) (2,497) (2,586) (2,411) (1,826)
Residential 1-4 family | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 505,794   515,262 524,414    
Allowance for loan losses (2,406) (2,576) (2,676) (2,400) (1,991) (2,317)
Home equity loans | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 30,370   36,684 40,693    
Allowance for loan losses (1,262) (1,242) (1,540) (1,593) (1,532) (1,841)
Other | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 80,297   55,721 49,456    
Allowance for loan losses (1,553) (1,451) (793) (700) (557) (586)
Commercial loans | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,741,362   2,627,838 2,607,788    
Allowance for loan losses (11,941) (12,099) (12,944) (12,879) (11,607) (11,441)
Commercial loans | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 45,161   62,088 69,728    
Allowance for loan losses (297) (358) (663) (960) (977) (642)
Home equity lines of credit | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 331,872   326,577 331,136    
Allowance for loan losses (5,734) (5,859) (6,042) (5,221) (5,048) (5,800)
Residential | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 169,034   121,296 114,574    
Allowance for loan losses (2,657) $ (2,538) (1,834) $ (1,626) $ (1,434) $ (1,184)
Originated            
Loans and Leases Receivable Disclosure [Line Items]            
Total principal balance of loans owed, net of charge-offs 3,319,052   2,991,324      
Unamortized net deferred loan fees (8,509)   (9,868)      
Total loans, net of unamortized deferred loan fees and discounts 3,310,543   2,981,456      
Allowance for loan losses (31,112)   (31,793)      
Originated | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,464,955   2,254,777      
Originated | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 385,598   351,133      
Originated | Commercial            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 256,379   228,635      
Originated | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 203,611   146,911      
Originated | Residential 1-4 family | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 355,646   343,796      
Originated | Home equity loans | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 27,034   32,660      
Originated | Other | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 64,153   34,020      
Originated | Commercial loans | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,109,309   1,910,981      
Originated | Commercial loans | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 44,704   56,208      
Originated | Home equity lines of credit | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 294,411   284,453      
Originated | Residential | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 158,907   90,703      
PNCI            
Loans and Leases Receivable Disclosure [Line Items]            
Total principal balance of loans owed, net of charge-offs 892,608   1,062,655      
Discounts to principal balance of loans owed, net of charge-offs (31,108)   (36,320)      
Total loans, net of unamortized deferred loan fees and discounts 861,500   1,026,335      
Allowance for loan losses (419)   (667)      
PNCI | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 775,655   878,193      
PNCI | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 55,692   66,201      
PNCI | Commercial            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 19,569   45,468      
PNCI | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 10,584   36,473      
PNCI | Residential 1-4 family | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 148,731   169,792      
PNCI | Home equity loans | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,915   3,585      
PNCI | Other | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 16,142   21,659      
PNCI | Commercial loans | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 626,924   708,401      
PNCI | Commercial loans | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 457   5,880      
PNCI | Home equity lines of credit | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 36,635   40,957      
PNCI | Residential | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 10,127   30,593      
PCI            
Loans and Leases Receivable Disclosure [Line Items]            
Total principal balance of loans owed, net of charge-offs 16,274   21,265      
Discounts to principal balance of loans owed, net of charge-offs (5,969)   (7,042)      
Total loans, net of unamortized deferred loan fees and discounts 10,305   14,223      
Allowance for loan losses (6)   (122)      
PCI | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 6,546   10,130      
PCI | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 1,249   1,648      
PCI | Commercial            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2,510   2,445      
PCI | Construction            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 0          
PCI | Residential 1-4 family | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 1,417   1,674      
PCI | Home equity loans | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 421   439      
PCI | Other | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 2   42      
PCI | Commercial loans | Mortgage Loans on Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts 5,129   8,456      
PCI | Home equity lines of credit | Consumer            
Loans and Leases Receivable Disclosure [Line Items]            
Total loans, net of unamortized deferred loan fees and discounts $ 826   $ 1,167