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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
Mar. 31, 2018
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment $ 745,805 $ 757,701
Interest income recognized, Total 9,971 6,611
Interest income recognized, Cash basis 7,320 4,009
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 181,846 182,857
Interest income recognized, Total 3,147 975
Interest income recognized, Cash basis 3,147 975
Commercial, Financial, Leasing, etc. [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 272,172 271,825
Interest income recognized, Total 783 478
Interest income recognized, Cash basis 783 478
Residential Builder and Developer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 9,840 20,051
Interest income recognized, Total 1,682 429
Interest income recognized, Cash basis 1,682 429
Other Commercial Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 10,102 16,328
Interest income recognized, Total 6 847
Interest income recognized, Cash basis 6 847
Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 121,209 103,875
Interest income recognized, Total 1,902 1,636
Interest income recognized, Cash basis 902 774
Residential Limited Documentation [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 85,595 97,121
Interest income recognized, Total 1,728 1,500
Interest income recognized, Cash basis 696 384
Home Equity Lines and Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 48,797 45,542
Interest income recognized, Total 414 399
Interest income recognized, Cash basis 86 100
Automobile [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 13,125 16,504
Interest income recognized, Total 224 275
Interest income recognized, Cash basis 15 19
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average recorded investment 3,119 3,598
Interest income recognized, Total 85 72
Interest income recognized, Cash basis $ 3 $ 3