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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale $ 2,956,125 $ 3,255,211
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 1,235 82
Interest rate swaps, liabilities 271,754 565,513
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets   0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets   3,255,293
Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 25,635 25,687
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 0 0
Interest rate swaps | Derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 0  
Interest rate swaps, liabilities 0  
Interest rate swaps | Derivatives Not Designated as Hedging Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 0 0
Interest rate swaps, liabilities 112 82
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,956,125 3,255,211
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 112 82
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 82
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 2,956,237  
Total liabilities 7,050 82
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  
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 25,635 25,687
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 | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 0  
Fair Value on Recurring Basis [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 32,253  
Fair Value on Recurring Basis [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  
Fair Value on Recurring Basis [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 on Recurring Basis [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 2,507,679 2,789,141
Fair Value on Recurring Basis [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 on Recurring Basis [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 on Recurring Basis [Member] | CMO/REMIC | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 389,362 439,303
Fair Value on Recurring Basis [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 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 1,196 1,080
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] | Total investment securities AFS | 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] | Total investment securities AFS | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,956,125 3,255,211
Fair Value on Recurring Basis [Member] | Total investment securities AFS | 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 | 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 on Recurring Basis [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 on Recurring Basis [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 on Recurring Basis [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, liabilities 0 0
Fair Value on Recurring Basis [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]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 112 82
Interest rate swaps, liabilities 112 82
Fair Value on Recurring Basis [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, 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 2,956,237 3,255,293
Total liabilities 7,050 82
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 25,635 25,687
Fair Value on Recurring Basis [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 32,253  
Fair Value on Recurring Basis [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 2,507,679 2,789,141
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO/REMIC    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 389,362 439,303
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 1,196 1,080
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Total investment securities AFS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale 2,956,125 3,255,211
Fair Value on Recurring Basis [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, liabilities 6,938  
Fair Value on Recurring Basis [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]    
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets 112 82
Interest rate swaps, liabilities $ 112 $ 82