v3.22.4
Loans (Troubled Debt Restructurings) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Balance at Restructure $ 1,155 $ 7,017 $ 17,524
Balance at Year-end 1,051 3,745 8,552
Commercial Portfolio Segment [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Balance at Restructure 0 1,312 3,661
Balance at Year-end 0 1,162 192
Commercial and Industrial Total Energy Loans [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Balance at Restructure 0 3,817 2,432
Balance at Year-end 0 721 2,421
Commercial Real Estate, Buildings, Land and Other [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Balance at Restructure 1,155 1,888 9,310
Balance at Year-end 1,051 1,862 4,922
Construction Loans [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Balance at Restructure 0 0 1,017
Balance at Year-end 0 0 1,017
Total consumer real estate loans [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Balance at Restructure 0 0 0
Balance at Year-end 0 0 0
Consumer Loan [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Balance at Restructure 0 0 1,104
Balance at Year-end $ 0 $ 0 $ 0