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Allowance for Loan Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total $ 4,022,014 $ 3,015,165 $ 2,759,593
Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 3,143,100 2,300,322 2,053,464
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 418,982 356,874 366,663
Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 276,548 220,412 217,047
Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 183,384 137,557 122,419
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 515,262 385,426 368,343
Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 36,684 43,031 46,182
Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 55,721 25,155 30,766
Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 2,627,838 1,914,896 1,685,121
Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 62,088 69,627 66,990
Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 326,577 288,688 289,715
Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 121,296 67,930 $ 55,429
Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 10,460 8,927  
Current 2,970,996 2,681,475  
Total 2,981,456 2,690,402  
Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 4,212 3,638  
Current 2,250,565 2,007,394  
Total 2,254,777 2,011,032  
Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 3,160 2,034  
Current 347,973 330,615  
Total 351,133 332,649  
Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,879 3,221  
Current 225,756 206,216  
Total 228,635 209,437  
Originated [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 209 34  
Current 146,702 137,250  
Total 146,911 137,284  
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,285 2,493  
Current 341,511 318,029  
Total 343,796 320,522  
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,281 991  
Current 31,379 38,857  
Total 32,660 39,848  
Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 315 95  
Current 33,705 22,764  
Total 34,020 22,859  
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,927 1,145  
Current 1,909,054 1,689,365  
Total 1,910,981 1,690,510  
Originated [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 56,208 69,364  
Total 56,208 69,364  
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,564 948  
Current 282,889 268,994  
Total 284,453 269,942  
Originated [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 209 34  
Current 90,494 67,886  
Total 90,703 67,920  
PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 6,908 2,682  
Current 1,019,427 306,521  
Total 1,026,335 309,203  
> 90 Days and Still Accruing   281  
PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 5,162 1,764  
Current 873,031 277,578  
Total 878,193 279,342  
> 90 Days and Still Accruing   81  
PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 810 918  
Current 65,391 20,279  
Total 66,201 21,197  
> 90 Days and Still Accruing   200  
PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 936    
Current 44,532 8,391  
Total 45,468 8,391  
PNCI [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 36,473 273  
Total 36,473 273  
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,298 1,694  
Current 168,494 61,825  
Total 169,792 63,519  
> 90 Days and Still Accruing   81  
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 74 30  
Current 3,511 2,668  
Total 3,585 2,698  
PNCI [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 160 32  
Current 21,499 2,219  
Total 21,659 2,251  
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 3,864 70  
Current 704,537 215,753  
Total 708,401 215,823  
PNCI [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 5,880 263  
Total 5,880 263  
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 576 856  
Current 40,381 15,392  
Total 40,957 16,248  
> 90 Days and Still Accruing   200  
PNCI [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 30,593 10  
Total 30,593 10  
30-59 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 5,617 3,983  
30-59 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,106 1,898  
30-59 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,249 1,095  
30-59 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,053 956  
30-59 Days [Member] | Originated [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 209 34  
30-59 Days [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,675 1,740  
30-59 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,043 511  
30-59 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 298 56  
30-59 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 431 158  
30-59 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 908 528  
30-59 Days [Member] | Originated [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 209 34  
30-59 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 3,871 1,899  
30-59 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,655 1,565  
30-59 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 538 334  
30-59 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 678    
30-59 Days [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,009 1,495  
30-59 Days [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 74 30  
30-59 Days [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 160 6  
30-59 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,646 70  
30-59 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 304 298  
60-89 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,999 2,426  
60-89 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,332 1,497  
60-89 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 88 191  
60-89 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 579 738  
60-89 Days [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 132 510  
60-89 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 24 107  
60-89 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 17 36  
60-89 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,200 987  
60-89 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 47 48  
60-89 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,449 344  
60-89 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,269 90  
60-89 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 35 254  
60-89 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 145    
60-89 Days [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 133 90  
60-89 Days [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due   26  
60-89 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,136    
60-89 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 35 228  
> 90 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,844 2,518  
> 90 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 774 243  
> 90 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 823 748  
> 90 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,247 1,527  
> 90 Days [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 478 243  
> 90 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 214 373  
> 90 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due   3  
> 90 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 296    
> 90 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 609 372  
> 90 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,588 439  
> 90 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,238 109  
> 90 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 237 330  
> 90 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 113    
> 90 Days [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 156 109  
> 90 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,082    
> 90 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due $ 237 $ 330