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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 9 Months Ended
Sep. 30, 2019
USD ($)
Modification
Sep. 30, 2018
USD ($)
Modification
Sep. 30, 2019
USD ($)
Modification
Sep. 30, 2018
USD ($)
Modification
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 97 151 322 438
Pre-modification Recorded Investment $ 16,466 $ 29,537 $ 86,580 $ 157,552
Post- modification $ 16,845 $ 30,086 $ 87,094 $ 161,617
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 9 18 38 66
Pre-modification Recorded Investment $ 2,986 $ 11,581 $ 22,567 $ 25,561
Post- modification 2,972 11,265 22,144 25,961
Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 5,388 9,992 23,981 80,032
Principal Deferral [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 383 1,493 3,947 14,693
Interest Rate Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   5   833
Interest Rate Reduction [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification       175
Other [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   3,475   9,980
Other [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   3,475   3,869
Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 11,457 16,614 63,113 70,772
Combination of Concession Types [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 2,589 $ 6,297 $ 18,197 $ 7,224
Commercial, Financial, Leasing, etc. [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 26 47 115 150
Pre-modification Recorded Investment $ 6,145 $ 6,837 $ 39,357 $ 96,221
Post- modification 6,107 6,706 39,409 96,884
Commercial, Financial, Leasing, etc. [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 1,441 1,683 8,582 47,029
Commercial, Financial, Leasing, etc. [Member] | Interest Rate Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   5   658
Commercial, Financial, Leasing, etc. [Member] | Other [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification       6,111
Commercial, Financial, Leasing, etc. [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 4,666 $ 5,018 $ 30,827 $ 43,086
Residential Builder and Developer [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification     2  
Pre-modification Recorded Investment     $ 1,330  
Post- modification     1,068  
Residential Builder and Developer [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification     $ 1,068  
Residential [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 20 34 63 111
Pre-modification Recorded Investment $ 5,161 $ 8,182 $ 16,490 $ 28,769
Post- modification 5,581 9,028 17,647 31,455
Residential [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 3,046 6,026 8,805 15,785
Residential [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 2,535 $ 3,002 $ 8,842 $ 15,670
Residential Limited Documentation [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 1 3 4 8
Pre-modification Recorded Investment $ 236 $ 716 $ 1,084 $ 1,595
Post- modification 240 847 1,104 1,890
Residential Limited Documentation [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification     399 467
Residential Limited Documentation [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 240 $ 847 $ 705 $ 1,423
Home Equity Lines and Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 12 17 32 41
Pre-modification Recorded Investment $ 1,392 $ 1,651 $ 3,141 $ 3,554
Post- modification 1,399 1,670 3,168 3,581
Home Equity Lines and Loans [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification   220 90 224
Home Equity Lines and Loans [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 1,399 $ 1,450 $ 3,078 $ 3,357
Automobile [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 26 30 58 57
Pre-modification Recorded Investment $ 485 $ 526 $ 991 $ 1,007
Post- modification 485 526 991 1,007
Automobile [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification 457 $ 526 926 995
Automobile [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 28   $ 65 $ 12
Recreational Finance [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 3 2 8 4
Pre-modification Recorded Investment $ 61 $ 44 $ 164 $ 93
Post- modification 61 44 164 93
Recreational Finance [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification $ 61 $ 44 $ 164 $ 93
Other Commercial Construction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification     2 1
Pre-modification Recorded Investment     $ 1,456 $ 752
Post- modification     1,399 746
Other Commercial Construction [Member] | Principal Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification       $ 746
Other Commercial Construction [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
Post- modification     $ 1,399