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Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities that were Considered Troubled Debt Restructurings (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Modification
Jun. 30, 2016
USD ($)
Modification
Jun. 30, 2017
USD ($)
Modification
Jun. 30, 2016
USD ($)
Modification
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 191 216 359 435
Pre-modification recorded investment $ 105,222 $ 106,670 $ 149,914 $ 141,574
Post- modification $ 89,163 $ 104,458 $ 129,055 $ 140,601
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 30 16 50 37
Pre-modification recorded investment $ 26,045 $ 14,643 $ 32,747 $ 22,059
Post- modification 26,058 14,294 32,655 21,666
Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 24,087 73,588 37,734 93,316
Principal Deferral [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 11,782 2,710 14,773 6,158
Other [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 5,556 4,613 6,853 4,676
Other [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   4,576   4,576
Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 59,520 26,257 84,468 42,609
Combination of Concession Types [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 14,276 $ 7,008 $ 17,882 $ 10,932
Commercial, Financial, Leasing, etc. [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 63 38 113 69
Pre-modification recorded investment $ 65,613 $ 60,990 $ 77,534 $ 78,718
Post- modification 48,960 59,874 56,883 78,547
Commercial, Financial, Leasing, etc. [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 8,172 45,657 12,561 58,378
Commercial, Financial, Leasing, etc. [Member] | Other [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 5,556   6,362  
Commercial, Financial, Leasing, etc. [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 35,232 $ 14,217 $ 37,960 $ 20,169
Residential Builder and Developer [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification   3 3 3
Pre-modification recorded investment   $ 23,905 $ 12,291 $ 23,905
Post- modification   22,958 10,879 22,958
Residential Builder and Developer [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   $ 22,958   $ 22,958
Residential Builder and Developer [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification     $ 10,879  
Other Commercial Construction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 1 2 2 2
Pre-modification recorded investment $ 66 $ 374 $ 168 $ 374
Post- modification 66 374 168 374
Other Commercial Construction [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 66 250 $ 168 250
Other Commercial Construction [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   $ 124   $ 124
Residential [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 30 16 71 43
Pre-modification recorded investment $ 7,956 $ 2,006 $ 17,336 $ 6,308
Post- modification 8,468 2,162 18,416 6,722
Residential [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 2,982 1,040 8,575 3,231
Residential [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 5,486 $ 1,122 $ 9,841 $ 3,491
Residential Limited Documentation [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 7 2 13 8
Pre-modification recorded investment $ 1,831 $ 151 $ 3,209 $ 1,588
Post- modification 1,895 195 3,420 1,712
Residential Limited Documentation [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 235 $ 195 235 333
Residential Limited Documentation [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 1,660   $ 3,185 $ 1,379
Home Equity Lines and Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 35 32 60 58
Pre-modification recorded investment $ 3,229 $ 3,806 $ 5,731 $ 6,637
Post- modification 3,234 3,806 5,736 6,637
Home Equity Lines and Loans [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 416 69 579 404
Home Equity Lines and Loans [Member] | Other [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification     491  
Home Equity Lines and Loans [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 2,818 $ 3,737 $ 4,666 $ 6,233
Automobile [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 22 66 42 138
Pre-modification recorded investment $ 428 $ 175 $ 818 $ 819
Post- modification 428 175 818 819
Automobile [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 380 158 763 679
Automobile [Member] | Other [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   $ 17   55
Automobile [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 48   $ 55 $ 85
Other [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 3 41 5 77
Pre-modification recorded investment $ 54 $ 620 $ 80 $ 1,166
Post- modification 54 620 80 1,166
Other [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 54 551 $ 80 925
Other [Member] | Other [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   20   45
Other [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   $ 49   $ 196