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Fair Values of Assets and Liabilities (Summary of Assets Measured at Fair Value on a Nonrecurring Basis) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Individually assessed loans - foreclosure probable and collateral-dependent $ 73,804 $ 73,804 $ 85,557
Fair value losses - individually assessed loans - foreclosure probable and collateral-dependent 11,635 14,136  
Fair value losses - other real estate owned 0 104  
Fair value losses 11,635 14,240  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Individually assessed loans - foreclosure probable and collateral-dependent 73,800 73,800  
Measured at fair value on a non-recurring basis:      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Individually assessed loans - foreclosure probable and collateral-dependent 73,804 73,804  
Other real estate owned 11,586 11,586  
Total 85,390 85,390  
Measured at fair value on a non-recurring basis: | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Individually assessed loans - foreclosure probable and collateral-dependent 0 0  
Other real estate owned 0 0  
Total 0 0  
Measured at fair value on a non-recurring basis: | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Individually assessed loans - foreclosure probable and collateral-dependent 0 0  
Other real estate owned 0 0  
Total 0 0  
Measured at fair value on a non-recurring basis: | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Individually assessed loans - foreclosure probable and collateral-dependent 73,804 73,804  
Other real estate owned 11,586 11,586  
Total $ 85,390 $ 85,390