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Loans and Leases - Schedule of Aging of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable      
Accruing $ 59,460 $ 68,617  
Non-accrual Loans 137,184 145,388  
Acquired Impaired Loans 169,725 238,127 $ 302,780
Total Loans 22,519,815 20,078,181  
Commercial Loans      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 125,706 194,201 282,001
Total Loans 15,125,322 14,073,297  
Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,054 727  
Non-accrual Loans 1,094 2,635  
Total Loans 1,196,366 1,240,396  
Commercial Loans | Commercial real estate - owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 7,167 2,364  
Non-accrual Loans 10,260 24,457  
Total Loans 2,395,822 2,375,321  
Commercial Loans | Commercial real estate - non-owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 7,833 9,378  
Non-accrual Loans 15,898 6,811  
Total Loans 5,796,117 5,322,513  
Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 7,012 11,660  
Non-accrual Loans 57,860 77,823  
Total Loans 5,737,017 5,135,067  
Residential Mortgage      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 6,579 6,749 4,312
Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Current 4,290,152 2,962,043  
Accruing 17,406 23,536  
Non-accrual Loans 30,396 17,387  
Total Loans 4,359,156 3,056,352  
Consumer and Other Loans      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 37,440 37,177 $ 16,467
Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Current 2,258,659 2,250,205  
Accruing 12,692 14,640  
Non-accrual Loans 18,830 12,365  
Total Loans 2,304,694 2,292,275  
Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Current 721,231 645,498  
Accruing 6,296 6,312  
Non-accrual Loans 2,846 3,910  
Total Loans 730,643 656,257  
Current or Less Than 30 days past due      
Accounts, Notes, Loans and Financing Receivable      
Current 21,959,758 19,382,621  
Current or Less Than 30 days past due | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Current 1,167,795 1,197,766  
Current or Less Than 30 days past due | Commercial Loans | Commercial real estate - owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Current 2,305,743 2,243,923  
Current or Less Than 30 days past due | Commercial Loans | Commercial real estate - non-owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Current 5,703,131 5,220,648  
Current or Less Than 30 days past due | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Current 5,645,304 5,014,438  
Current or Less Than 30 days past due | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Current 4,218,146 2,877,048  
Current or Less Than 30 days past due | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Current 2,200,517 2,186,554  
Current or Less Than 30 days past due | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Current 719,122 642,244  
30-59 days      
Accounts, Notes, Loans and Financing Receivable      
Accruing 38,579 36,818  
30-59 days | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,054 269  
30-59 days | Commercial Loans | Commercial real estate - owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 7,167 1,631  
30-59 days | Commercial Loans | Commercial real estate - non-owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 7,473 2,086  
30-59 days | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 5,139 5,788  
30-59 days | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,768 10,083  
30-59 days | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 10,283 11,675  
30-59 days | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 4,695 5,286  
60-89 days      
Accounts, Notes, Loans and Financing Receivable      
Accruing 18,753 24,899  
60-89 days | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
60-89 days | Commercial Loans | Commercial real estate - owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 659  
60-89 days | Commercial Loans | Commercial real estate - non-owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 360 6,405  
60-89 days | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,320 5,726  
60-89 days | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 13,063 8,136  
60-89 days | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,409 2,947  
60-89 days | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,601 1,026  
Greater than 90 days      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,128 6,900  
Greater than 90 days | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 458  
Greater than 90 days | Commercial Loans | Commercial real estate - owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 74  
Greater than 90 days | Commercial Loans | Commercial real estate - non-owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 887  
Greater than 90 days | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 553 146  
Greater than 90 days | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,575 5,317  
Greater than 90 days | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 18  
Greater than 90 days | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Acquired Loans      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 363,413 481,555  
Acquired Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 26,423 39,268  
Acquired Loans | Commercial Loans | Commercial real estate - owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 72,652 104,577  
Acquired Loans | Commercial Loans | Commercial real estate - non-owner-occupied      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 69,255 85,676  
Acquired Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 26,841 31,146  
Acquired Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 93,208 138,381  
Acquired Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 72,655 78,716  
Acquired Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans $ 2,379 $ 3,791