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Loans - Summary of Loan Balances (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts $ 3,069,733 $ 3,015,165 $ 2,761,192  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 3,069,733 3,015,165 2,761,192  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 3,069,733 3,015,165 2,761,192  
Commercial 3,093,564 3,038,472    
Unamortized net deferred loan fees (9,671) (8,651)    
Discounts to principal balance of loans owed, net of charge-offs (14,160) (14,656)    
Total loans, net of unamortized deferred loan fees and discounts 3,069,733 3,015,165 2,761,192  
Allowance for loan losses (29,973) (30,323) (31,017) $ (32,503)
Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 2,359,379 2,300,322    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 2,359,379 2,300,322    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 2,359,379 2,300,322    
Total loans, net of unamortized deferred loan fees and discounts 2,359,379 2,300,322    
Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 348,789 356,874    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 348,789 356,874    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 348,789 356,874    
Total loans, net of unamortized deferred loan fees and discounts 348,789 356,874    
Commercial Portfolio Segment [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 216,015 220,412    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 216,015 220,412    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 216,015 220,412    
Total loans, net of unamortized deferred loan fees and discounts 216,015 220,412    
Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 145,550 137,557    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 145,550 137,557    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 145,550 137,557    
Total loans, net of unamortized deferred loan fees and discounts 145,550 137,557    
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426    
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426    
Home Equity Loans [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 41,932 43,031 40,241  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 41,932 43,031 40,241  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 41,932 43,031 40,241  
Total loans, net of unamortized deferred loan fees and discounts 41,932 43,031 40,241  
Allowance for loan losses (1,736) (1,841) (2,451) (2,644)
Other Consumer [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 23,606 25,155 29,313  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 23,606 25,155 29,313  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 23,606 25,155 29,313  
Total loans, net of unamortized deferred loan fees and discounts 23,606 25,155 29,313  
Allowance for loan losses (570) (586) (595) (622)
Commercial [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 1,973,268 1,914,896 1,761,114  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 1,973,268 1,914,896 1,761,114  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 1,973,268 1,914,896 1,761,114  
Total loans, net of unamortized deferred loan fees and discounts 1,973,268 1,914,896 1,761,114  
Allowance for loan losses (11,495) (11,441) (11,542) (11,517)
Commercial [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 73,952 69,627 64,843  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 73,952 69,627 64,843  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 73,952 69,627 64,843  
Total loans, net of unamortized deferred loan fees and discounts 73,952 69,627 64,843  
Allowance for loan losses (847) (642) (572) (680)
Home Equity Lines of Credit [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 283,251 288,688 283,596  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 283,251 288,688 283,596  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 283,251 288,688 283,596  
Total loans, net of unamortized deferred loan fees and discounts 283,251 288,688 283,596  
Allowance for loan losses (5,412) (5,800) (6,530) (7,044)
Residential [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426 309,701  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426 309,701  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426 309,701  
Total loans, net of unamortized deferred loan fees and discounts 386,111 385,426 309,701  
Allowance for loan losses (2,170) (2,317) (2,662) (2,748)
Residential [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 71,598 67,930 59,699  
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 71,598 67,930 59,699  
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 71,598 67,930 59,699  
Total loans, net of unamortized deferred loan fees and discounts 71,598 67,930 59,699  
Allowance for loan losses (1,351) (1,184) $ (1,339) $ (1,417)
Originated [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 2,755,148 2,690,402    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 2,755,148 2,690,402    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 2,755,148 2,690,402    
Commercial 2,764,819 2,699,053    
Unamortized net deferred loan fees (9,671) (8,651)    
Total loans, net of unamortized deferred loan fees and discounts 2,755,148 2,690,402    
Allowance for loan losses (29,057) (29,122)    
Originated [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 2,077,223 2,011,032    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 2,077,223 2,011,032    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 2,077,223 2,011,032    
Total loans, net of unamortized deferred loan fees and discounts 2,077,223 2,011,032    
Originated [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 326,962 332,649    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 326,962 332,649    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 326,962 332,649    
Total loans, net of unamortized deferred loan fees and discounts 326,962 332,649    
Originated [Member] | Commercial Portfolio Segment [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 205,673 209,437    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 205,673 209,437    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 205,673 209,437    
Total loans, net of unamortized deferred loan fees and discounts 205,673 209,437    
Originated [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 145,290 137,284    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 145,290 137,284    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 145,290 137,284    
Total loans, net of unamortized deferred loan fees and discounts 145,290 137,284    
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 323,161 320,522    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 323,161 320,522    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 323,161 320,522    
Total loans, net of unamortized deferred loan fees and discounts 323,161 320,522    
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 38,889 39,848    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 38,889 39,848    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 38,889 39,848    
Total loans, net of unamortized deferred loan fees and discounts 38,889 39,848    
Originated [Member] | Other Consumer [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 21,422 22,859    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 21,422 22,859    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 21,422 22,859    
Total loans, net of unamortized deferred loan fees and discounts 21,422 22,859    
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 1,754,062 1,690,510    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 1,754,062 1,690,510    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 1,754,062 1,690,510    
Total loans, net of unamortized deferred loan fees and discounts 1,754,062 1,690,510    
Originated [Member] | Commercial [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 73,701 69,364    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 73,701 69,364    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 73,701 69,364    
Total loans, net of unamortized deferred loan fees and discounts 73,701 69,364    
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 266,651 269,942    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 266,651 269,942    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 266,651 269,942    
Total loans, net of unamortized deferred loan fees and discounts 266,651 269,942    
Originated [Member] | Residential [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 71,589 67,920    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 71,589 67,920    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 71,589 67,920    
Total loans, net of unamortized deferred loan fees and discounts 71,589 67,920    
PNCI [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 300,109 309,203    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 300,109 309,203    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 300,109 309,203    
Commercial 306,924 316,238    
Discounts to principal balance of loans owed, net of charge-offs (6,815) (7,035)    
Total loans, net of unamortized deferred loan fees and discounts 300,109 309,203    
Allowance for loan losses (748) (929)    
PNCI [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 272,374 279,342    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 272,374 279,342    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 272,374 279,342    
Total loans, net of unamortized deferred loan fees and discounts 272,374 279,342    
PNCI [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 19,638 21,197    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 19,638 21,197    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 19,638 21,197    
Total loans, net of unamortized deferred loan fees and discounts 19,638 21,197    
PNCI [Member] | Commercial Portfolio Segment [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 7,837 8,391    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 7,837 8,391    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 7,837 8,391    
Total loans, net of unamortized deferred loan fees and discounts 7,837 8,391    
PNCI [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 260 273    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 260 273    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 260 273    
Total loans, net of unamortized deferred loan fees and discounts 260 273    
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 61,206 63,519    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 61,206 63,519    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 61,206 63,519    
Total loans, net of unamortized deferred loan fees and discounts 61,206 63,519    
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 2,558 2,698    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 2,558 2,698    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 2,558 2,698    
Total loans, net of unamortized deferred loan fees and discounts 2,558 2,698    
PNCI [Member] | Other Consumer [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 2,141 2,251    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 2,141 2,251    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 2,141 2,251    
Total loans, net of unamortized deferred loan fees and discounts 2,141 2,251    
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 211,168 215,823    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 211,168 215,823    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 211,168 215,823    
Total loans, net of unamortized deferred loan fees and discounts 211,168 215,823    
PNCI [Member] | Commercial [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 251 263    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 251 263    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 251 263    
Total loans, net of unamortized deferred loan fees and discounts 251 263    
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 14,939 16,248    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 14,939 16,248    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 14,939 16,248    
Total loans, net of unamortized deferred loan fees and discounts 14,939 16,248    
PNCI [Member] | Residential [Member] | Construction [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 9 10    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 9 10    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 9 10    
Total loans, net of unamortized deferred loan fees and discounts 9 10    
PCI - Cash Basis [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Commercial 5,167 5,863    
Discounts to principal balance of loans owed, net of charge-offs (3,548) (3,794)    
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Allowance for loan losses (8) (17)    
PCI - Cash Basis [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
PCI - Cash Basis [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
Total loans, net of unamortized deferred loan fees and discounts 1,619 2,069    
PCI - Other [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 12,857 13,491    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 12,857 13,491    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 12,857 13,491    
Commercial 16,654 17,318    
Discounts to principal balance of loans owed, net of charge-offs (3,797) (3,827)    
Total loans, net of unamortized deferred loan fees and discounts 12,857 13,491    
Allowance for loan losses (160) (255)    
PCI - Other [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 9,782 9,948    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 9,782 9,948    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 9,782 9,948    
Total loans, net of unamortized deferred loan fees and discounts 9,782 9,948    
PCI - Other [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 570 959    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 570 959    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 570 959    
Total loans, net of unamortized deferred loan fees and discounts 570 959    
PCI - Other [Member] | Commercial Portfolio Segment [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 2,505 2,584    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 2,505 2,584    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 2,505 2,584    
Total loans, net of unamortized deferred loan fees and discounts 2,505 2,584    
PCI - Other [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 1,744 1,385    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 1,744 1,385    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 1,744 1,385    
Total loans, net of unamortized deferred loan fees and discounts 1,744 1,385    
PCI - Other [Member] | Home Equity Loans [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 485 485    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 485 485    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 485 485    
Total loans, net of unamortized deferred loan fees and discounts 485 485    
PCI - Other [Member] | Other Consumer [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 43 45    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 43 45    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 43 45    
Total loans, net of unamortized deferred loan fees and discounts 43 45    
PCI - Other [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 8,038 8,563    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 8,038 8,563    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 8,038 8,563    
Total loans, net of unamortized deferred loan fees and discounts 8,038 8,563    
PCI - Other [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]        
Mortgage loans on real estate:        
Total loans, net of unamortized deferred loan fees and discounts 42 429    
Consumer:        
Total loans, net of unamortized deferred loan fees and discounts 42 429    
Construction:        
Total loans, net of unamortized deferred loan fees and discounts 42 429    
Total loans, net of unamortized deferred loan fees and discounts $ 42 $ 429