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Loans and Leases - Schedule of Aging of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable    
Accruing $ 59,408 $ 59,460
Non-accrual Loans 153,113 137,184
Acquired Impaired Loans 205,395 169,725
Total Loans 23,676,537 22,519,815
Non-accrual loans 30-59 days past due 10,700 7,000
Non-accrual loans past due 60-89 days 4,500 3,700
Non-accrual loans over 90 days past due 73,400 66,900
Commercial Loans    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 125,065 125,706
Total Loans 16,299,881 15,125,322
Commercial Loans | Real estate - construction    
Accounts, Notes, Loans and Financing Receivable    
Accruing 3,851 1,054
Non-accrual Loans 1,381 1,094
Total Loans 1,330,014 1,196,366
Commercial Loans | Real estate - owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 3,325 7,167
Non-accrual Loans 17,158 10,260
Total Loans 2,468,061 2,395,822
Commercial Loans | Real estate - non-owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 5,191 7,833
Non-accrual Loans 20,201 15,898
Total Loans 6,011,681 5,796,117
Commercial Loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable    
Accruing 8,079 7,012
Non-accrual Loans 43,494 57,860
Total Loans 6,490,125 5,737,017
Residential mortgage loans    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 42,423 6,579
Residential mortgage loans | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable    
Current 4,567,633 4,290,152
Accruing 16,383 17,406
Non-accrual Loans 50,439 30,396
Total Loans 4,649,745 4,359,156
Consumer and Other Loans    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 37,907 37,440
Consumer and Other Loans | Consumer - Home equity    
Accounts, Notes, Loans and Financing Receivable    
Current 2,011,913 2,258,659
Accruing 17,240 12,692
Non-accrual Loans 18,311 18,830
Total Loans 2,053,588 2,304,694
Consumer and Other Loans | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Current 665,702 721,231
Accruing 5,339 6,296
Non-accrual Loans 2,129 2,846
Total Loans 673,323 730,643
Current or Less Than 30 days past due    
Accounts, Notes, Loans and Financing Receivable    
Current 23,178,119 21,959,758
Current or Less Than 30 days past due | Commercial Loans | Real estate - construction    
Accounts, Notes, Loans and Financing Receivable    
Current 1,307,793 1,167,795
Current or Less Than 30 days past due | Commercial Loans | Real estate - owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Current 2,389,631 2,305,743
Current or Less Than 30 days past due | Commercial Loans | Real estate - non-owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Current 5,930,480 5,703,131
Current or Less Than 30 days past due | Commercial Loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable    
Current 6,417,203 5,645,304
Current or Less Than 30 days past due | Residential mortgage loans | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable    
Current 4,502,109 4,218,146
Current or Less Than 30 days past due | Consumer and Other Loans | Consumer - Home equity    
Accounts, Notes, Loans and Financing Receivable    
Current 1,967,342 2,200,517
Current or Less Than 30 days past due | Consumer and Other Loans | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Current 663,561 719,122
30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Accruing 26,391 38,579
30-59 days | Commercial Loans | Real estate - construction    
Accounts, Notes, Loans and Financing Receivable    
Accruing 3,851 1,054
30-59 days | Commercial Loans | Real estate - owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 2,294 7,167
30-59 days | Commercial Loans | Real estate - non-owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 2,093 7,473
30-59 days | Commercial Loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable    
Accruing 3,614 5,139
30-59 days | Residential mortgage loans | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable    
Accruing 1,252 2,768
30-59 days | Consumer and Other Loans | Consumer - Home equity    
Accounts, Notes, Loans and Financing Receivable    
Accruing 10,448 10,283
30-59 days | Consumer and Other Loans | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Accruing 2,839 4,695
60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Accruing 28,227 18,753
60-89 days | Commercial Loans | Real estate - construction    
Accounts, Notes, Loans and Financing Receivable    
Accruing 0 0
60-89 days | Commercial Loans | Real estate - owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 1,031 0
60-89 days | Commercial Loans | Real estate - non-owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 2,672 360
60-89 days | Commercial Loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable    
Accruing 1,769 1,320
60-89 days | Residential mortgage loans | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable    
Accruing 13,463 13,063
60-89 days | Consumer and Other Loans | Consumer - Home equity    
Accounts, Notes, Loans and Financing Receivable    
Accruing 6,792 2,409
60-89 days | Consumer and Other Loans | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Accruing 2,500 1,601
Greater than 90 days    
Accounts, Notes, Loans and Financing Receivable    
Accruing 4,790 2,128
Greater than 90 days | Commercial Loans | Real estate - construction    
Accounts, Notes, Loans and Financing Receivable    
Accruing 0 0
Greater than 90 days | Commercial Loans | Real estate - owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 0 0
Greater than 90 days | Commercial Loans | Real estate - non-owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Accruing 426 0
Greater than 90 days | Commercial Loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable    
Accruing 2,696 553
Greater than 90 days | Residential mortgage loans | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable    
Accruing 1,668 1,575
Greater than 90 days | Consumer and Other Loans | Consumer - Home equity    
Accounts, Notes, Loans and Financing Receivable    
Accruing 0 0
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 285,897 363,413
Acquired Loans | Commercial Loans | Real estate - construction    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 16,989 26,423
Acquired Loans | Commercial Loans | Real estate - owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 57,947 72,652
Acquired Loans | Commercial Loans | Real estate - non-owner-occupied    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 55,809 69,255
Acquired Loans | Commercial Loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 21,349 26,841
Acquired Loans | Residential mortgage loans | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 80,814 93,208
Acquired Loans | Consumer and Other Loans | Consumer - Home equity    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans 50,695 72,655
Acquired Loans | Consumer and Other Loans | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Acquired Impaired Loans $ 2,294 $ 2,379