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Loans (Impaired Loans) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance $ 128,536  
Recorded Investment With No Allowance 21,842  
Recorded Investment With Allowance 77,611  
Total Recorded Investment 99,453  
Related Allowance 28,483  
Average Recorded Investment 84,352 $ 108,127
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 30,909  
Recorded Investment With No Allowance 11,588  
Recorded Investment With Allowance 12,772  
Total Recorded Investment 24,360  
Related Allowance 7,849  
Average Recorded Investment 14,913 18,246
Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 87,103  
Recorded Investment With No Allowance 2,764  
Recorded Investment With Allowance 62,480  
Total Recorded Investment 65,244  
Related Allowance 20,246  
Average Recorded Investment 53,563 75,453
Commercial Real Estate, Buildings, Land and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 9,252  
Recorded Investment With No Allowance 6,255  
Recorded Investment With Allowance 2,354  
Total Recorded Investment 8,609  
Related Allowance 383  
Average Recorded Investment 13,690 12,799
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 697  
Recorded Investment With No Allowance 665  
Recorded Investment With Allowance 0  
Total Recorded Investment 665  
Related Allowance 0  
Average Recorded Investment 354 0
Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 570  
Recorded Investment With No Allowance 570  
Recorded Investment With Allowance 0  
Total Recorded Investment 570  
Related Allowance 0  
Average Recorded Investment 547 704
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Contractual Principal Balance 5  
Recorded Investment With No Allowance 0  
Recorded Investment With Allowance 5  
Total Recorded Investment 5  
Related Allowance 5  
Average Recorded Investment $ 1,285 $ 925