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Allowance for Loan Losses - Analysis of Current and Past Due Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total $ 3,146,313 $ 3,015,165 $ 2,826,393
Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 2,401,040 2,300,322 2,106,567
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 350,925 356,874 360,782
Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 237,619 220,412 225,743
Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 156,729 137,557 133,301
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 384,692 385,426 381,305
Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 40,986 43,031 45,936
Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 23,503 25,155 28,370
Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 2,016,348 1,914,896 1,725,262
Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 83,151 69,627 70,151
Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 286,436 288,688 286,476
Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 73,578 67,930 $ 63,150
Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,835,209 2,681,475  
Total 2,845,838 2,690,402  
Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,127,775 2,007,394  
Total 2,131,979 2,011,032  
Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 328,491 330,615  
Total 329,786 332,649  
Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 224,541 206,216  
Total 227,591 209,437  
Originated [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 154,402 137,250  
Total 156,482 137,284  
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 324,595 318,029  
Total 326,149 320,522  
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 37,088 38,857  
Total 38,082 39,848  
Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 21,362 22,764  
Total 21,421 22,859  
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,803,180 1,689,365  
Total 1,805,830 1,690,510  
Originated [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 80,832 69,364  
Total 82,912 69,364  
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 270,041 268,994  
Total 270,283 269,942  
Originated [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 73,570 67,886  
Total 73,570 67,920  
PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 285,617 306,521  
Total 286,614 309,203  
> 90 Days and Still Accruing   281  
PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 259,053 277,578  
Total 259,746 279,342  
> 90 Days and Still Accruing   81  
PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 18,762 20,279  
Total 19,066 21,197  
> 90 Days and Still Accruing   200  
PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 7,555 8,391  
Total 7,555 8,391  
PNCI [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 247 273  
Total 247 273  
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 56,650 61,825  
Total 56,823 63,519  
> 90 Days and Still Accruing   81  
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,406 2,668  
Total 2,449 2,698  
PNCI [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,037 2,219  
Total 2,039 2,251  
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 202,403 215,753  
Total 202,923 215,823  
PNCI [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 239 263  
Total 239 263  
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 14,319 15,392  
Total 14,578 16,248  
> 90 Days and Still Accruing   200  
PNCI [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 8 10  
Total 8 10  
30-59 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 3,856 3,983  
30-59 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,552 1,898  
30-59 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 549 1,095  
30-59 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 506 956  
30-59 Days [Member] | Originated [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,249 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 271 1,740  
30-59 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 358 511  
30-59 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 33 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 1,281 158  
30-59 Days [Member] | Originated [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,249    
30-59 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 158 528  
30-59 Days [Member] | Originated [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due   34  
30-59 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 599 1,899  
30-59 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 415 1,565  
30-59 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 184 334  
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 59 1,495  
30-59 Days [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due   30  
30-59 Days [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2 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 356 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 182 298  
60-89 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,451 2,426  
60-89 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 641 1,497  
60-89 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 213 191  
60-89 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 766 738  
60-89 Days [Member] | Originated [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 831    
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 64 510  
60-89 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 150 107  
60-89 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 26 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 577 987  
60-89 Days [Member] | Originated [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 831    
60-89 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 37 48  
60-89 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 285 344  
60-89 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 242 90  
60-89 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 43 254  
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 78 90  
60-89 Days [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 43    
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 164    
60-89 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due   228  
> 90 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 4,322 2,518  
> 90 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,011 243  
> 90 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 533 748  
> 90 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,778 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 1,219 243  
> 90 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 486 373  
> 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 792    
> 90 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 47 372  
> 90 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 113 439  
> 90 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 36 109  
> 90 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 77 330  
> 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 36 109  
> 90 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due $ 77 $ 330