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Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Risk Category Of Loans [Line Items]      
Total loans $ 13,786,479   $ 12,117,524
Adjusted Balance      
Risk Category Of Loans [Line Items]      
Total loans 13,786,479 $ 12,122,002  
Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 101,194    
Auto      
Risk Category Of Loans [Line Items]      
Total loans 3,292    
Other      
Risk Category Of Loans [Line Items]      
Total loans 14,607    
Commercial      
Risk Category Of Loans [Line Items]      
Total loans 3,956,422   2,890,296
Commercial | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 281,337    
2016 130,543    
2017 256,753    
2018 202,025    
2019 440,462    
2020 1,709,047    
Revolving Loans 576,278    
Revolving to Term Loans 161,255    
Total loans 3,757,700 2,817,833  
Commercial | Commercial Real Estate - Construction      
Risk Category Of Loans [Line Items]      
Total loans     713,092
Commercial | Commercial Real Estate - Other      
Risk Category Of Loans [Line Items]      
Total loans     4,453,700
Commercial | Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 8,976    
Commercial | Auto      
Risk Category Of Loans [Line Items]      
Total loans 394    
Commercial | Other      
Risk Category Of Loans [Line Items]      
Total loans 893    
Commercial real estate      
Risk Category Of Loans [Line Items]      
Total loans 5,946,512   5,166,792
Commercial real estate | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 571,651    
2016 539,960    
2017 779,186    
2018 794,524    
2019 1,099,162    
2020 1,556,959    
Revolving Loans 28,122    
Revolving to Term Loans 405,247    
Total loans 5,774,811 4,890,890  
Commercial real estate | Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 60,844    
Commercial real estate | Auto      
Risk Category Of Loans [Line Items]      
Total loans 0    
Commercial real estate | Other      
Risk Category Of Loans [Line Items]      
Total loans 13,685    
BBCC | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 5,357    
2016 25,622    
2017 37,218    
2018 51,672    
2019 77,287    
2020 96,821    
Revolving Loans 53,667    
Revolving to Term Loans 22,779    
Total loans 370,423 352,714  
BBCC | Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 1,425    
BBCC | Auto      
Risk Category Of Loans [Line Items]      
Total loans 134    
BBCC | Other      
Risk Category Of Loans [Line Items]      
Total loans 0    
Residential real estate      
Risk Category Of Loans [Line Items]      
Prior to 2016 641,774    
2016 204,588    
2017 191,268    
2018 132,787    
2019 453,383    
2020 624,500    
Revolving Loans 0    
Revolving to Term Loans 122    
Total loans 2,248,422   2,334,289
Residential real estate | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Total loans 2,248,422 2,334,394  
Residential real estate | Performing      
Risk Category Of Loans [Line Items]      
Prior to 2016 620,999    
2016 202,457    
2017 190,376    
2018 132,107    
2019 453,132    
2020 624,435    
Revolving Loans 0    
Revolving to Term Loans 122    
Total loans 2,223,628   2,311,670
Residential real estate | Nonperforming      
Risk Category Of Loans [Line Items]      
Prior to 2016 20,775    
2016 2,131    
2017 892    
2018 680    
2019 251    
2020 65    
Revolving Loans 0    
Revolving to Term Loans 0    
Total loans 24,794   22,619
Residential real estate | Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 24,794    
Residential real estate | Auto      
Risk Category Of Loans [Line Items]      
Total loans 0    
Residential real estate | Other      
Risk Category Of Loans [Line Items]      
Total loans 0    
Indirect      
Risk Category Of Loans [Line Items]      
Prior to 2016 21,280    
2016 52,654    
2017 97,253    
2018 135,670    
2019 253,957    
2020 353,011    
Revolving Loans 0    
Revolving to Term Loans 77    
Total loans 913,902    
Indirect | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Total loans 913,902 935,594  
Indirect | Performing      
Risk Category Of Loans [Line Items]      
Prior to 2016 21,088    
2016 52,225    
2017 96,587    
2018 134,893    
2019 253,514    
2020 352,989    
Revolving Loans 0    
Revolving to Term Loans 77    
Total loans 911,373    
Indirect | Nonperforming      
Risk Category Of Loans [Line Items]      
Prior to 2016 192    
2016 429    
2017 666    
2018 777    
2019 443    
2020 22    
Revolving Loans 0    
Revolving to Term Loans 0    
Total loans 2,529    
Indirect | Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 0    
Indirect | Auto      
Risk Category Of Loans [Line Items]      
Total loans 2,529    
Indirect | Other      
Risk Category Of Loans [Line Items]      
Total loans 0    
Direct      
Risk Category Of Loans [Line Items]      
Prior to 2016 19,991    
2016 8,774    
2017 16,246    
2018 30,681    
2019 29,330    
2020 32,521    
Revolving Loans 26,032    
Revolving to Term Loans 1,232    
Total loans 164,807    
Direct | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Total loans 164,807 228,526  
Direct | Performing      
Risk Category Of Loans [Line Items]      
Prior to 2016 19,465    
2016 8,527    
2017 16,182    
2018 30,510    
2019 29,189    
2020 32,499    
Revolving Loans 26,028    
Revolving to Term Loans 1,229    
Total loans 163,629    
Direct | Nonperforming      
Risk Category Of Loans [Line Items]      
Prior to 2016 526    
2016 247    
2017 64    
2018 171    
2019 141    
2020 22    
Revolving Loans 4    
Revolving to Term Loans 3    
Total loans 1,178    
Direct | Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 901    
Direct | Auto      
Risk Category Of Loans [Line Items]      
Total loans 235    
Direct | Other      
Risk Category Of Loans [Line Items]      
Total loans 29    
Home equity      
Risk Category Of Loans [Line Items]      
Prior to 2016 116    
2016 249    
2017 891    
2018 444    
2019 1,034    
2020 1    
Revolving Loans 529,369    
Revolving to Term Loans 24,310    
Total loans 556,414    
Home equity | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Total loans 556,414 $ 562,051  
Home equity | Performing      
Risk Category Of Loans [Line Items]      
Prior to 2016 0    
2016 238    
2017 891    
2018 444    
2019 997    
2020 1    
Revolving Loans 529,275    
Revolving to Term Loans 20,314    
Total loans 552,160    
Home equity | Nonperforming      
Risk Category Of Loans [Line Items]      
Prior to 2016 116    
2016 11    
2017 0    
2018 0    
2019 37    
2020 0    
Revolving Loans 94    
Revolving to Term Loans 3,996    
Total loans 4,254    
Home equity | Real Estate      
Risk Category Of Loans [Line Items]      
Total loans 4,254    
Home equity | Auto      
Risk Category Of Loans [Line Items]      
Total loans 0    
Home equity | Other      
Risk Category Of Loans [Line Items]      
Total loans 0    
Consumer      
Risk Category Of Loans [Line Items]      
Total loans 1,635,123   1,726,147
Consumer | Home Equity Line of Credit      
Risk Category Of Loans [Line Items]      
Total loans     559,021
Consumer | Home Equity Line of Credit | Performing      
Risk Category Of Loans [Line Items]      
Total loans     555,025
Consumer | Home Equity Line of Credit | Nonperforming      
Risk Category Of Loans [Line Items]      
Total loans     3,996
Consumer | Auto      
Risk Category Of Loans [Line Items]      
Total loans     1,017,287
Consumer | Auto | Performing      
Risk Category Of Loans [Line Items]      
Total loans     1,013,760
Consumer | Auto | Nonperforming      
Risk Category Of Loans [Line Items]      
Total loans     3,527
Consumer | Other      
Risk Category Of Loans [Line Items]      
Total loans     149,839
Consumer | Other | Performing      
Risk Category Of Loans [Line Items]      
Total loans     147,383
Consumer | Other | Nonperforming      
Risk Category Of Loans [Line Items]      
Total loans     2,456
Pass | Commercial      
Risk Category Of Loans [Line Items]      
Total loans     2,702,605
Pass | Commercial | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 262,538    
2016 124,041    
2017 227,710    
2018 171,228    
2019 420,736    
2020 1,675,964    
Revolving Loans 549,849    
Revolving to Term Loans 148,508    
Total loans 3,580,574    
Pass | Commercial | Commercial Real Estate - Construction      
Risk Category Of Loans [Line Items]      
Total loans     665,512
Pass | Commercial | Commercial Real Estate - Other      
Risk Category Of Loans [Line Items]      
Total loans     4,191,455
Pass | Commercial real estate | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 513,658    
2016 496,086    
2017 677,119    
2018 749,102    
2019 1,041,305    
2020 1,537,226    
Revolving Loans 28,122    
Revolving to Term Loans 382,219    
Total loans 5,424,837    
Pass | BBCC | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 5,327    
2016 24,946    
2017 36,288    
2018 49,875    
2019 73,913    
2020 94,828    
Revolving Loans 52,393    
Revolving to Term Loans 19,353    
Total loans 356,923    
Criticized | Commercial      
Risk Category Of Loans [Line Items]      
Total loans     84,676
Criticized | Commercial | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 5,369    
2016 3,383    
2017 9,508    
2018 15,003    
2019 9,603    
2020 23,982    
Revolving Loans 10,307    
Revolving to Term Loans 2,685    
Total loans 79,840    
Criticized | Commercial | Commercial Real Estate - Construction      
Risk Category Of Loans [Line Items]      
Total loans     34,651
Criticized | Commercial | Commercial Real Estate - Other      
Risk Category Of Loans [Line Items]      
Total loans     115,514
Criticized | Commercial real estate | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 33,490    
2016 17,648    
2017 46,994    
2018 26,464    
2019 49,271    
2020 6,874    
Revolving Loans 0    
Revolving to Term Loans 19,804    
Total loans 200,545    
Criticized | BBCC | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 0    
2016 643    
2017 414    
2018 621    
2019 1,403    
2020 1,599    
Revolving Loans 868    
Revolving to Term Loans 1,259    
Total loans 6,807    
Classified - Substandard | Commercial      
Risk Category Of Loans [Line Items]      
Total loans     63,979
Classified - Substandard | Commercial | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 8,441    
2016 2,774    
2017 9,836    
2018 10,077    
2019 6,369    
2020 6,501    
Revolving Loans 15,344    
Revolving to Term Loans 3,049    
Total loans 62,391    
Classified - Substandard | Commercial | Commercial Real Estate - Construction      
Risk Category Of Loans [Line Items]      
Total loans     0
Classified - Substandard | Commercial | Commercial Real Estate - Other      
Risk Category Of Loans [Line Items]      
Total loans     101,693
Classified - Substandard | Commercial real estate | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 8,665    
2016 5,308    
2017 26,691    
2018 13,565    
2019 4,700    
2020 11,451    
Revolving Loans 0    
Revolving to Term Loans 2,911    
Total loans 73,291    
Classified - Substandard | BBCC | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 0    
2016 33    
2017 246    
2018 195    
2019 1,417    
2020 233    
Revolving Loans 317    
Revolving to Term Loans 701    
Total loans 3,142    
Classified - Nonaccrual | Commercial      
Risk Category Of Loans [Line Items]      
Total loans     22,240
Classified - Nonaccrual | Commercial | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 4,379    
2016 49    
2017 6,951    
2018 4,701    
2019 3,754    
2020 2,600    
Revolving Loans 778    
Revolving to Term Loans 7,013    
Total loans 30,225    
Classified - Nonaccrual | Commercial | Commercial Real Estate - Construction      
Risk Category Of Loans [Line Items]      
Total loans     12,929
Classified - Nonaccrual | Commercial | Commercial Real Estate - Other      
Risk Category Of Loans [Line Items]      
Total loans     38,822
Classified - Nonaccrual | Commercial real estate | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 12,564    
2016 1,635    
2017 9,456    
2018 5,393    
2019 2,054    
2020 1,408    
Revolving Loans 0    
Revolving to Term Loans 313    
Total loans 32,823    
Classified - Nonaccrual | BBCC | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 0    
2016 0    
2017 200    
2018 134    
2019 551    
2020 161    
Revolving Loans 89    
Revolving to Term Loans 1,466    
Total loans 2,601    
Classified - Doubtful | Commercial      
Risk Category Of Loans [Line Items]      
Total loans     16,796
Classified - Doubtful | Commercial | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 610    
2016 296    
2017 2,748    
2018 1,016    
2019 0    
2020 0    
Revolving Loans 0    
Revolving to Term Loans 0    
Total loans 4,670    
Classified - Doubtful | Commercial | Commercial Real Estate - Construction      
Risk Category Of Loans [Line Items]      
Total loans     0
Classified - Doubtful | Commercial | Commercial Real Estate - Other      
Risk Category Of Loans [Line Items]      
Total loans     $ 6,216
Classified - Doubtful | Commercial real estate | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 3,274    
2016 19,283    
2017 18,926    
2018 0    
2019 1,832    
2020 0    
Revolving Loans 0    
Revolving to Term Loans 0    
Total loans 43,315    
Classified - Doubtful | BBCC | Adjusted Balance      
Risk Category Of Loans [Line Items]      
Prior to 2016 30    
2016 0    
2017 70    
2018 847    
2019 3    
2020 0    
Revolving Loans 0    
Revolving to Term Loans 0    
Total loans $ 950