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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale $ 2,542,115 $ 2,956,125
Interest rate swaps, assets 8,086 1,235
Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 20,377 25,635
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 261,917 112
Interest rate swaps, liabilities 30 271,754
Interest rate swaps | Derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 0 0
Interest rate swaps | Derivatives Not Designated as Hedging Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 30 112
Interest rate swaps, liabilities 30 112
Interest rate swaps | Cash Flow Hedging [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Interest rate swaps, liabilities 0  
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,542,115 2,956,125
Interest rate swaps, assets   112
Carrying Value [Member] | Derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities   6,938
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities   112
Carrying Value [Member] | Interest rate swaps | Derivatives Not Designated as Hedging Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 30 0
Interest rate swaps, liabilities 30  
Carrying Value [Member] | Interest rate swaps | Fair Value Hedging [Member] | Derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 7,222  
Interest rate swaps, liabilities 0  
Carrying Value [Member] | Interest rate swaps | Cash Flow Hedging [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Interest rate swaps, liabilities 517  
Fair Value, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 0 0
Fair Value, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,549,367 2,956,237
Total liabilities 547 7,050
Fair Value, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 0 0
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 20,377 25,635
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Government agency/GSE | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Government agency/GSE | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 34,255 32,253
Fair Value, Recurring [Member] | Government agency/GSE | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Mortgage-backed securities | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Mortgage-backed securities | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,134,534 2,507,679
Fair Value, Recurring [Member] | Mortgage-backed securities | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | CMO/REMIC | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | CMO/REMIC | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 351,522 389,362
Fair Value, Recurring [Member] | CMO/REMIC | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Other Securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Other Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 1,427 1,196
Fair Value, Recurring [Member] | Other Securities [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Investment Securities-AFS [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Investment Securities-AFS [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,542,115 2,956,125
Fair Value, Recurring [Member] | Investment Securities-AFS [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0 0
Fair Value, Recurring [Member] | Interest rate swaps | Derivatives designated as hedging instruments | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities   0
Fair Value, Recurring [Member] | Interest rate swaps | Derivatives designated as hedging instruments | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities   6,938
Fair Value, Recurring [Member] | Interest rate swaps | Derivatives designated as hedging instruments | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities   0
Fair Value, Recurring [Member] | Interest rate swaps | Derivatives Not Designated as Hedging Instruments [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 0 0
Fair Value, Recurring [Member] | Interest rate swaps | Derivatives Not Designated as Hedging Instruments [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 30 112
Interest rate swaps, liabilities 30 112
Fair Value, Recurring [Member] | Interest rate swaps | Derivatives Not Designated as Hedging Instruments [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 0 0
Fair Value, Recurring [Member] | Interest rate swaps | Fair Value Hedging [Member] | Derivatives designated as hedging instruments | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 0  
Fair Value, Recurring [Member] | Interest rate swaps | Fair Value Hedging [Member] | Derivatives designated as hedging instruments | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 7,222 0
Interest rate swaps, liabilities 0  
Fair Value, Recurring [Member] | Interest rate swaps | Fair Value Hedging [Member] | Derivatives designated as hedging instruments | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 0  
Fair Value, Recurring [Member] | Interest rate swaps | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Interest rate swaps, liabilities 0  
Fair Value, Recurring [Member] | Interest rate swaps | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Interest rate swaps, liabilities 517  
Fair Value, Recurring [Member] | Interest rate swaps | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Interest rate swaps, liabilities 0  
Fair Value, Recurring [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,549,367 2,956,237
Total liabilities 547 7,050
Fair Value, Recurring [Member] | Carrying Value [Member] | Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 20,377 25,635
Fair Value, Recurring [Member] | Carrying Value [Member] | Government agency/GSE    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 34,255 32,253
Fair Value, Recurring [Member] | Carrying Value [Member] | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,134,534 2,507,679
Fair Value, Recurring [Member] | Carrying Value [Member] | CMO/REMIC    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 351,522 389,362
Fair Value, Recurring [Member] | Carrying Value [Member] | Other Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 1,427 1,196
Fair Value, Recurring [Member] | Carrying Value [Member] | Investment Securities-AFS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,542,115 2,956,125
Fair Value, Recurring [Member] | Carrying Value [Member] | Interest rate swaps | Derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets   0
Interest rate swaps, liabilities   6,938
Fair Value, Recurring [Member] | Carrying Value [Member] | Interest rate swaps | Derivatives Not Designated as Hedging Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 30 112
Interest rate swaps, liabilities 30 $ 112
Fair Value, Recurring [Member] | Carrying Value [Member] | Interest rate swaps | Fair Value Hedging [Member] | Derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 7,222  
Interest rate swaps, liabilities 0  
Fair Value, Recurring [Member] | Carrying Value [Member] | Interest rate swaps | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Interest rate swaps, liabilities $ 517