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Loans and Leases and the Allowance for Credit Losses - Interest Income Recognized on Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment $ 812,353 $ 757,997 $ 804,751 $ 744,561
Interest income recognized, Total 7,199 11,147 26,390 30,818
Interest income recognized, Cash basis 4,046 8,195 16,829 22,055
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 201,931 204,315 214,027 184,795
Interest income recognized, Total 1,798 1,489 4,921 8,447
Interest income recognized, Cash basis 1,798 1,489 4,921 8,447
Commercial, Financial, Leasing, etc. [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 288,516 256,196 275,896 266,594
Interest income recognized, Total 836 1,985 7,501 4,101
Interest income recognized, Cash basis 836 1,985 7,501 4,101
Residential Builder and Developer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 11,837 9,000 10,101 9,111
Interest income recognized, Total 89   239 1,682
Interest income recognized, Cash basis 89   239 1,682
Other Commercial Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 32,458 9,623 25,126 9,056
Interest income recognized, Total 13 3,379 589 3,438
Interest income recognized, Cash basis 13 3,379 589 3,438
Residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 143,508 133,337 142,155 126,910
Interest income recognized, Total 2,353 1,959 6,765 6,190
Interest income recognized, Cash basis 984 773 2,654 2,612
Residential Limited Documentation [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 72,926 81,729 75,702 83,700
Interest income recognized, Total 1,348 1,607 4,153 4,763
Interest income recognized, Cash basis 229 481 655 1,494
Home Equity Lines and Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 46,982 48,542 47,325 48,661
Interest income recognized, Total 416 421 1,238 1,268
Interest income recognized, Cash basis 74 62 193 220
Recreational Finance [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 5,562 3,531 5,799 2,156
Interest income recognized, Total 147 65 414 193
Interest income recognized, Cash basis 4 1 12 6
Automobile [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 3,413 7,805 3,465 11,189
Interest income recognized, Total 54 181 161 630
Interest income recognized, Cash basis 18 20 55 49
Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average recorded investment 5,220 3,919 5,155 2,389
Interest income recognized, Total 145 61 409 106
Interest income recognized, Cash basis $ 1 $ 5 $ 10 $ 6