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Allowance for Loan Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total $ 4,103,687 $ 4,022,014 $ 3,146,313
Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 3,178,730 3,143,100 2,401,040
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 434,388 418,982 350,925
Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 276,045 276,548 237,619
Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 214,524 183,384 156,729
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 506,049 515,262 384,692
Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 32,345 36,684 40,986
Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 71,143 55,721 23,503
Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 2,672,681 2,627,838 2,016,348
Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 57,009 62,088 83,151
Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 330,900 326,577 286,436
Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 157,515 121,296 $ 73,578
Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 10,666 10,460  
Current 3,174,222 2,970,996  
Total 3,184,888 2,981,456  
> 90 Days and Still Accruing 22    
Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 4,622 4,212  
Current 2,350,100 2,250,565  
Total 2,354,722 2,254,777  
Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,846 3,160  
Current 374,076 347,973  
Total 376,922 351,133  
> 90 Days and Still Accruing 12    
Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 3,047 2,879  
Current 245,476 225,756  
Total 248,523 228,635  
> 90 Days and Still Accruing 10    
Originated [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 151 209  
Current 204,570 146,702  
Total 204,721 146,911  
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,525 2,285  
Current 346,212 341,511  
Total 348,737 343,796  
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 871 1,281  
Current 28,170 31,379  
Total 29,041 32,660  
Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 64 315  
Current 53,276 33,705  
Total 53,340 34,020  
> 90 Days and Still Accruing 12    
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,097 1,927  
Current 2,003,888 1,909,054  
Total 2,005,985 1,910,981  
Originated [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 56,289 56,208  
Total 56,289 56,208  
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,911 1,564  
Current 292,630 282,889  
Total 294,541 284,453  
Originated [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 151 209  
Current 148,281 90,494  
Total 148,432 90,703  
PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 3,534 6,908  
Current 903,770 1,019,427  
Total 907,304 1,026,335  
PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,827 5,162  
Current 814,782 873,031  
Total 816,609 878,193  
PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 379 810  
Current 55,529 65,391  
Total 55,908 66,201  
PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,083 936  
Current 23,901 44,532  
Total 24,984 45,468  
PNCI [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 245    
Current 9,558 36,473  
Total 9,803 36,473  
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 682 1,298  
Current 155,190 168,494  
Total 155,872 169,792  
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 62 74  
Current 2,813 3,511  
Total 2,875 3,585  
PNCI [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 119 160  
Current 17,683 21,499  
Total 17,802 21,659  
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,145 3,864  
Current 659,592 704,537  
Total 660,737 708,401  
PNCI [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 245    
Current 475 5,880  
Total 720 5,880  
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 198 576  
Current 35,033 40,381  
Total 35,231 40,957  
PNCI [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 9,083 30,593  
Total 9,083 30,593  
30-59 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 4,768 5,617  
30-59 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,657 2,106  
30-59 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,806 2,249  
30-59 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,154 1,053  
30-59 Days [Member] | Originated [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 151 209  
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 635 1,675  
30-59 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 565 1,043  
30-59 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 44 298  
30-59 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,022 431  
30-59 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,197 908  
30-59 Days [Member] | Originated [Member] | Residential [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 151 209  
30-59 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,347 3,871  
30-59 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 0 2,655  
30-59 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 282 538  
30-59 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 820 678  
30-59 Days [Member] | PNCI [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 245    
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 0 1,009  
30-59 Days [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 62 74  
30-59 Days [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 119 160  
30-59 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 0 1,646  
30-59 Days [Member] | PNCI [Member] | Commercial [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 245    
30-59 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 101 304  
60-89 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 3,525 1,999  
60-89 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,306 1,332  
60-89 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 659 88  
60-89 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,560 579  
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 1,132 132  
60-89 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 89 24  
60-89 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 13 17  
60-89 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 174 1,200  
60-89 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 557 47  
60-89 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,100 1,449  
60-89 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 877 1,269  
60-89 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 73 35  
60-89 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 150 145  
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 682 133  
60-89 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 195 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 73 35  
> 90 Days [Member] | Originated [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 2,373 2,844  
> 90 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,659 774  
> 90 Days [Member] | Originated [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 381 823  
> 90 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 333 1,247  
> 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 758 478  
> 90 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 217 214  
> 90 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 7    
> 90 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 901 296  
> 90 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 157 609  
> 90 Days [Member] | PNCI [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 1,087 1,588  
> 90 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 950 1,238  
> 90 Days [Member] | PNCI [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 24 237  
> 90 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 113 113  
> 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  
> 90 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due 950 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 $ 24 $ 237