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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Assets    
Total cash and cash equivalents $ 529,089 $ 204,698
Fair Value, Available-for-sale 2,535,066 2,542,115
Investment securities held-to-maturity 2,359,141 2,379,668
Total loans, net of allowance for loan losses 8,285,380 8,456,310
Deposits:    
Interest-bearing 4,805,654 4,911,285
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 529,089 204,698
Interest-earning balances due from depository institutions 3,451 480
Fair Value, Available-for-sale 2,535,066 2,542,115
Investment securities held-to-maturity 2,359,141 2,379,668
Total loans, net of allowance for loan losses 8,285,380 8,456,310
Deposits:    
Interest-bearing 4,805,654 4,911,285
Borrowings 776,163 761,887
Carrying Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   0
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 78 30
Deposits:    
Interest rate swaps, liabilities 78 30
Carrying Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 1,095 7,222
Carrying Value [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 2,257  
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 529,089 204,698
Interest-earning balances due from depository institutions 3,451 480
Fair Value, Available-for-sale 2,535,066 2,542,115
Investment securities held-to-maturity 1,965,088 1,954,345
Total loans, net of allowance for loan losses 8,009,031 8,149,801
Deposits:    
Interest-bearing 4,802,342 4,908,070
Borrowings 746,328 716,566
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 529,089 204,698
Interest-earning balances due from depository institutions 0 0
Fair Value, Available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 0 0
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 3,451 480
Fair Value, Available-for-sale 2,535,066 2,542,115
Investment securities held-to-maturity 1,965,088 1,954,345
Total loans, net of allowance for loan losses 0 0
Deposits:    
Interest-bearing 4,802,342 4,908,070
Borrowings 746,328 716,566
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 0 0
Fair Value, Available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 8,009,031 8,149,801
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 1 [Member]    
Assets    
Interest rate swaps, assets   0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 2 [Member]    
Assets    
Interest rate swaps, assets   0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 3 [Member]    
Assets    
Interest rate swaps, assets   0
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 78 30
Deposits:    
Interest rate swaps, liabilities 78 30
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Level 1 [Member]    
Assets    
Interest rate swaps, assets 0 0
Deposits:    
Interest rate swaps, liabilities 0 0
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Level 2 [Member]    
Assets    
Interest rate swaps, assets 78 30
Deposits:    
Interest rate swaps, liabilities 78 30
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Level 3 [Member]    
Assets    
Interest rate swaps, assets 0 0
Deposits:    
Interest rate swaps, liabilities 0 0
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 1,095 7,222
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 1 [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0 0
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 2 [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 1,095 7,222
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 3 [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0 $ 0
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 2,257  
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Level 1 [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0  
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Level 2 [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 2,257  
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Level 3 [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities $ 0