v3.25.2
Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale $ 2,486,306 $ 2,542,115
Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 20,619 20,377
Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 188 7,252
Interest rate swaps, liabilities 416,782 262,434
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 188 30
Interest rate swaps, liabilities 188 30
Fair Value Hedging [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 7,222
Interest rate swaps, liabilities 9,585 0
Cash Flow Hedging [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets  
Interest rate swaps, liabilities 2,855 517
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,486,306 2,542,115
Carrying Value [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 188 30
Interest rate swaps, liabilities 188 30
Carrying Value [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 7,222
Interest rate swaps, liabilities 9,585 0
Carrying Value [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 2,855 517
Fair Value on Recurring Basis [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 on Recurring Basis [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,486,494 2,549,367
Total liabilities 12,628 547
Fair Value on Recurring Basis [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 on Recurring Basis [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 on Recurring Basis [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 20,619 20,377
Fair Value on Recurring Basis [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 on Recurring Basis [Member] | Government agency/GSE [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 on Recurring Basis [Member] | Government agency/GSE [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 34,372 34,255
Fair Value on Recurring Basis [Member] | Government agency/GSE [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 on Recurring Basis [Member] | Residential Mortgage-backed 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 on Recurring Basis [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,080,184 2,134,534
Fair Value on Recurring Basis [Member] | Residential Mortgage-backed 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 on Recurring Basis [Member] | CMO/REMIC - Residential [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 on Recurring Basis [Member] | CMO/REMIC - Residential [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 349,610 351,522
Fair Value on Recurring Basis [Member] | CMO/REMIC - Residential [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 on Recurring Basis [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 on Recurring Basis [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 1,521 1,427
Fair Value on Recurring Basis [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 on Recurring Basis [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 on Recurring Basis [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 2,486,306 2,542,115
Fair Value on Recurring Basis [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 on Recurring Basis [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | 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 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 188 30
Interest rate swaps, liabilities 188 30
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | 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 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [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
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Level 2 [Member]    
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 on Recurring Basis [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [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
Fair Value on Recurring Basis [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Fair Value on Recurring Basis [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0  
Fair Value on Recurring Basis [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities 0  
Fair Value on Recurring Basis [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | 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 9,585  
Fair Value on Recurring Basis [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities 0  
Fair Value on Recurring Basis [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [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 on Recurring Basis [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 2,855 517
Fair Value on Recurring Basis [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [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 on Recurring Basis [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,486,494 2,549,367
Total liabilities 12,628 547
Fair Value on Recurring Basis [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 20,619 20,377
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Government agency/GSE [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 34,372 34,255
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Residential Mortgage-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,080,184 2,134,534
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO/REMIC - Residential [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 349,610 351,522
Fair Value on Recurring Basis [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 1,521 1,427
Fair Value on Recurring Basis [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 2,486,306 2,542,115
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 188 30
Interest rate swaps, liabilities 188 30
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, liabilities   0
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 7,222
Interest rate swaps, liabilities 9,585  
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities $ 2,855 $ 517