v3.26.1
Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale $ 3,457,764 $ 2,683,070
Interest rate swaps, assets 29,141 161
Interest rate swaps, liabilities 589,140 502,031
Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 20,825 21,290
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 3,457,764 2,683,070
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 25,321 161
Interest rate swaps, liabilities 25,321 161
Carrying Value [Member] | Fair Value Hedges [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 3,820 8,650
Carrying Value [Member] | Cash flow hedges [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 414 2,619
Fair Value on Recurring Basis [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 15,140  
Total assets 15,140 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 3,486,905 2,683,231
Total liabilities 25,735 11,430
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 20,825 21,290
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 45,526 35,284
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] | 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] | 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 2,576,758 1,887,654
Fair Value on Recurring Basis [Member] | 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 [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 [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 770,589 695,150
Fair Value on Recurring Basis [Member] | CMO/REMIC [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] | Collateralized Loan Obligations [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 42,029 42,000
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 2,037 1,692
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 3,457,764 2,683,070
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 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 25,321 161
Interest rate swaps, liabilities 25,321 161
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 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
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   8,650
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
Fair Value on Recurring Basis [Member] | Fair Value Hedges [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 Hedges [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, liabilities 3,820  
Fair Value on Recurring Basis [Member] | Fair Value Hedges [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 hedges [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 0
Fair Value on Recurring Basis [Member] | Cash flow hedges [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, liabilities 414 2,619
Fair Value on Recurring Basis [Member] | Cash flow hedges [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 0
Fair Value on Recurring Basis [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 15,140  
Total assets 3,502,045 2,683,231
Total liabilities 25,735 11,430
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 20,825 21,290
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 45,526 35,284
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Mortgage-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,576,758 1,887,654
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO/REMIC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 770,589 695,150
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Collateralized Loan Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 42,029 42,000
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 2,037 1,692
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 3,457,764 2,683,070
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 25,321 161
Interest rate swaps, liabilities 25,321 161
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Fair Value Hedges [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   8,650
Interest rate swaps, liabilities 3,820  
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Cash flow hedges [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 $ 414 $ 2,619