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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Assets    
Total cash and cash equivalents $ 844,194 $ 281,285
Investment securities available-for-sale 2,745,796 2,956,125
Investment securities held-to-maturity 2,429,886 2,464,610
Total loans, net of allowance for loan losses 8,599,060 8,818,068
Deposits:    
Interest-bearing 4,700,230 4,227,467
Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0 0
Deposits:    
Interest rate swaps, liabilities 268,854 271,754
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0 0
Deposits:    
Interest rate swaps, liabilities 28 112
Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   0
Fair Value Hedging [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0  
Cash Flow Hedging [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0  
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 844,194 281,285
Interest-earning balances due from depository institutions 7,345 8,216
Investment securities available-for-sale 2,745,796 2,956,125
Investment securities held-to-maturity 2,429,886 2,464,610
Total loans, net of allowance for loan losses 8,599,060 8,818,068
Deposits:    
Interest-bearing 4,700,230 4,227,467
Borrowings 2,068,826 2,341,642
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 28 112
Deposits:    
Interest rate swaps, liabilities 28 112
Carrying Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   0
Carrying Value [Member] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 13,728  
Deposits:    
Interest rate swaps, liabilities 0 6,938
Carrying Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 1,584  
Deposits:    
Interest rate swaps, liabilities 0  
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 844,194 281,285
Interest-earning balances due from depository institutions 7,345 8,216
Investment securities available-for-sale 2,745,796 2,956,125
Investment securities held-to-maturity 2,006,090 2,082,881
Total loans, net of allowance for loan losses 8,217,593 8,503,518
Deposits:    
Interest-bearing 4,695,747 4,222,773
Borrowings 2,009,323 2,283,631
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 844,194 281,285
Interest-earning balances due from depository institutions 0 0
Investment securities 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 7,345 8,216
Investment securities available-for-sale 2,745,796 2,956,125
Investment securities held-to-maturity 2,006,090 2,082,881
Total loans, net of allowance for loan losses 0 0
Deposits:    
Interest-bearing 4,695,747 4,222,773
Borrowings 2,009,323 2,283,631
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 0
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 8,217,593 8,503,518
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 28 112
Deposits:    
Interest rate swaps, liabilities 28 112
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 1 [Member] | Interest Rate Swaps [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] | Level 2 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 28 112
Deposits:    
Interest rate swaps, liabilities 28 112
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 3 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0 0
Deposits:    
Interest rate swaps, liabilities 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] | Level 1 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   0
Estimated Fair Value [Member] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 13,728  
Deposits:    
Interest rate swaps, liabilities 0 6,938
Estimated Fair Value [Member] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 1 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0 0
Estimated Fair Value [Member] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 13,728  
Deposits:    
Interest rate swaps, liabilities 0 6,938
Estimated Fair Value [Member] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0 $ 0
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 1,584  
Deposits:    
Interest rate swaps, liabilities 0  
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 1 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities 0  
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 1,584  
Deposits:    
Interest rate swaps, liabilities 0  
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0  
Deposits:    
Interest rate swaps, liabilities $ 0