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Loans (Impaired Loans) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance $ 128,536 $ 94,536 $ 172,396
Recorded Investment With No Allowance 21,842 12,120 68,726
Recorded Investment With Allowance 77,611 58,101 76,884
Total Recorded Investment 99,453 70,221 145,610
Related Allowance 28,483 16,235 20,820
Average Recorded Investment 84,352 108,127 113,907
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 30,909 9,094 60,781
Recorded Investment With No Allowance 11,588 2,842 28,038
Recorded Investment With Allowance 12,772 4,287 15,722
Total Recorded Investment 24,360 7,129 43,760
Related Allowance 7,849 2,558 7,553
Average Recorded Investment 14,913 18,246 30,073
Commercial and Industrial Total Energy Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 87,103 67,900 99,606
Recorded Investment With No Allowance 2,764 6,817 33,080
Recorded Investment With Allowance 62,480 39,890 61,162
Total Recorded Investment 65,244 46,707 94,242
Related Allowance 20,246 9,671 13,267
Average Recorded Investment 53,563 75,453 76,492
Commercial Real Estate, Buildings, Land and Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 9,252 15,774 10,795
Recorded Investment With No Allowance 6,255 2,168 6,394
Recorded Investment With Allowance 2,354 12,517 0
Total Recorded Investment 8,609 14,685 6,394
Related Allowance 383 2,599 0
Average Recorded Investment 13,690 12,799 6,164
Construction Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 697 0 0
Recorded Investment With No Allowance 665 0 0
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 665 0 0
Related Allowance 0 0 0
Average Recorded Investment 354 0 0
Total consumer real estate loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 570 293 1,214
Recorded Investment With No Allowance 570 293 1,214
Recorded Investment With Allowance 0 0 0
Total Recorded Investment 570 293 1,214
Related Allowance 0 0 0
Average Recorded Investment 547 704 1,167
Consumer Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Contractual Principal Balance 5 1,475 0
Recorded Investment With No Allowance 0 0 0
Recorded Investment With Allowance 5 1,407 0
Total Recorded Investment 5 1,407 0
Related Allowance 5 1,407 0
Average Recorded Investment $ 1,285 $ 925 $ 11