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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, 2021
USD ($)
Modification
Sep. 30, 2020
USD ($)
Modification
Sep. 30, 2021
USD ($)
Modification
Sep. 30, 2020
USD ($)
Modification
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 395 1,085 1,742 3,575
Pre-modification Recorded Investment $ 125,101 $ 73,071 $ 511,038 $ 292,445
post modification recorded investment 124,785 73,598 507,582 283,415
Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 56,116 35,178 196,378 117,336
Interest Rate Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment   470   803
Other        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 40,504 30 71,296 36,435
Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 28,165 $ 37,920 $ 239,908 $ 128,841
Commercial, Financial, Leasing, etc. [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 62 112 244 279
Pre-modification Recorded Investment $ 49,884 $ 35,037 $ 174,366 $ 102,865
post modification recorded investment 49,772 34,955 173,377 101,678
Commercial, Financial, Leasing, etc. [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 6,051 7,145 42,143 29,762
Commercial, Financial, Leasing, etc. [Member] | Interest Rate Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment   298   298
Commercial, Financial, Leasing, etc. [Member] | Other        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 40,242   40,464 31,605
Commercial, Financial, Leasing, etc. [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 3,479 $ 27,512 $ 90,770 $ 40,013
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 15 50 83 106
Pre-modification Recorded Investment $ 53,198 $ 13,293 $ 223,209 $ 94,807
post modification recorded investment 53,172 13,308 221,129 82,623
Commercial Real Estate [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 30,311 12,506 48,841 24,372
Commercial Real Estate [Member] | Interest Rate Reduction [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment   172   505
Commercial Real Estate [Member] | Other        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 262 30 30,832 4,830
Commercial Real Estate [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 22,599 $ 600 $ 141,456 $ 52,916
Residential Builder and Developer [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification       1
Pre-modification Recorded Investment       $ 91
post modification recorded investment       90
Residential Builder and Developer [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment       $ 90
Other Commercial Construction [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification     3  
Pre-modification Recorded Investment     $ 542  
post modification recorded investment     532  
Other Commercial Construction [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment     $ 532  
Residential [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 64 30 304 82
Pre-modification Recorded Investment $ 14,443 $ 8,544 $ 88,067 $ 27,594
post modification recorded investment 14,265 9,133 87,802 30,991
Residential [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 12,281 5,517 80,411 11,865
Residential [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 1,984 $ 3,616 $ 7,391 $ 19,126
Home Equity Lines and Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 22 33 64 159
Pre-modification Recorded Investment $ 1,349 $ 3,410 $ 5,034 $ 11,719
post modification recorded investment 1,349 3,415 4,979 11,745
Home Equity Lines and Loans [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment 1,246 129 4,702 688
Home Equity Lines and Loans [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 103 $ 3,286 $ 277 $ 11,057
Recreational Finance [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 67 74 173 348
Pre-modification Recorded Investment $ 2,565 $ 2,734 $ 5,896 $ 13,619
post modification recorded investment 2,565 2,734 5,896 13,619
Recreational Finance [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 2,565 $ 2,734 $ 5,896 $ 13,619
Automobile [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 146 403 516 1,873
Pre-modification Recorded Investment $ 2,711 $ 7,007 $ 9,182 $ 33,541
post modification recorded investment 2,711 7,007 9,182 33,541
Automobile [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 2,711 7,005 9,168 33,539
Automobile [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment   $ 2 $ 14 $ 2
Other [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 15   338  
Pre-modification Recorded Investment $ 123   $ 2,393  
post modification recorded investment 123   2,393  
Other [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 123   $ 2,393  
Other        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification   383   718
Pre-modification Recorded Investment   $ 3,046   $ 5,229
post modification recorded investment   3,046   5,229
Other | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment   142   824
Other | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment   $ 2,904   $ 4,405
Residential Limited Documentation [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modifications | Modification 4   17 9
Pre-modification Recorded Investment $ 828   $ 2,349 $ 2,980
post modification recorded investment 828   2,292 3,899
Residential Limited Documentation [Member] | Payment Deferral [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment $ 828   $ 2,292 2,667
Residential Limited Documentation [Member] | Combination of Concession Types [Member]        
Financing Receivable, Modifications [Line Items]        
post modification recorded investment       $ 1,232