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Loans - Summary of Loan Balances (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]        
Total principal balance of loans owed, net of charge-offs $ 4,085,452 $ 4,075,244    
Unamortized net deferred loan fees (9,413) (9,868)    
Discounts to principal balance of loans owed, net of charge-offs (41,708) (43,362)    
Total loans, net of unamortized deferred loan fees and discounts 4,034,331 4,022,014 $ 3,069,733  
Allowance for loan losses (32,064) (32,582) (29,973) $ (30,323)
Mortgage Loans on Real Estate [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 3,129,339 3,143,100 2,359,379  
Allowance for loan losses (14,830) (15,620) (13,665) (13,758)
Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 418,352 418,982 348,789  
Allowance for loan losses (8,341) (8,375) (7,718) (8,227)
Commercial Portfolio Segment [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 269,163 276,548 216,015  
Allowance for loan losses (6,078) (6,090) (6,392) (6,512)
Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 217,477 183,384 145,550  
Allowance for loan losses (2,815) (2,497) (2,198) (1,826)
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 522,412 515,262 386,111  
Allowance for loan losses (2,500) (2,676) (2,170) (2,317)
Home Equity Loans [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 35,037 36,684 41,932  
Allowance for loan losses (1,286) (1,540) (1,736) (1,841)
Other Consumer [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 65,062 55,721 23,606  
Allowance for loan losses (1,040) (793) (570) (586)
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 2,606,927 2,627,838 1,973,268  
Allowance for loan losses (12,330) (12,944) (11,495) (11,441)
Commercial [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 71,693 62,088 73,952  
Allowance for loan losses (407) (663) (847) (642)
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 318,253 326,577 283,251  
Allowance for loan losses (6,015) (6,042) (5,412) (5,800)
Residential [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 145,784 121,296 71,598  
Allowance for loan losses (2,408) (1,834) $ (1,351) $ (1,184)
Originated [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total principal balance of loans owed, net of charge-offs 3,059,398 2,991,324    
Unamortized net deferred loan fees (9,413) (9,868)    
Total loans, net of unamortized deferred loan fees and discounts 3,049,985 2,981,456    
Allowance for loan losses (31,088) (31,793)    
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 2,287,067 2,254,777    
Originated [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 355,340 351,133    
Originated [Member] | Commercial Portfolio Segment [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 227,314 228,635    
Originated [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 180,264 146,911    
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 357,559 343,796    
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 31,245 32,660    
Originated [Member] | Other Consumer [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 45,020 34,020    
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 1,929,508 1,910,981    
Originated [Member] | Commercial [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 64,576 56,208    
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 279,075 284,453    
Originated [Member] | Residential [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 115,688 90,703    
PNCI [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total principal balance of loans owed, net of charge-offs 1,007,678 1,062,655    
Discounts to principal balance of loans owed, net of charge-offs (35,058) (36,320)    
Total loans, net of unamortized deferred loan fees and discounts 972,620 1,026,335    
Allowance for loan losses (969) (667)    
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 834,665 878,193    
PNCI [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 61,447 66,201    
PNCI [Member] | Commercial Portfolio Segment [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 39,295 45,468    
PNCI [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 37,213 36,473    
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 163,268 169,792    
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 3,356 3,585    
PNCI [Member] | Other Consumer [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 20,001 21,659    
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 671,397 708,401    
PNCI [Member] | Commercial [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 7,117 5,880    
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 38,090 40,957    
PNCI [Member] | Residential [Member] | Construction [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 30,096 30,593    
PCI [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total principal balance of loans owed, net of charge-offs 18,376 21,265    
Discounts to principal balance of loans owed, net of charge-offs (6,650) (7,042)    
Total loans, net of unamortized deferred loan fees and discounts 11,726 14,223    
Allowance for loan losses (7) (122)    
PCI [Member] | Mortgage Loans on Real Estate [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 7,607 10,130    
PCI [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 1,565 1,648    
PCI [Member] | Commercial Portfolio Segment [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 2,554 2,445    
PCI [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 1,585 1,674    
PCI [Member] | Home Equity Loans [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 436 439    
PCI [Member] | Other Consumer [Member] | Consumer [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Total loans, net of unamortized deferred loan fees and discounts 41 42    
PCI [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 6,022 8,456    
PCI [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 $ 1,088 $ 1,167