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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets    
Total cash and cash equivalents $ 783,920 $ 204,698
Investment securities available-for-sale 2,579,397 2,542,115
Investment securities held-to-maturity 2,297,909 2,379,668
Total loans, net of allowance for loan losses 8,391,570 8,456,310
Deposits:    
Interest-bearing 4,879,271 4,911,285
Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 220 7,252
Deposits:    
Interest rate swaps, liabilities 465,079 262,434
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 220 30
Deposits:    
Interest rate swaps, liabilities 220 30
Fair Value Hedging [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0 7,222
Deposits:    
Interest rate swaps, liabilities 10,838 0
Cash Flow Hedging [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 0 0
Deposits:    
Interest rate swaps, liabilities 2,763 517
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 783,920 204,698
Interest-earning balances due from depository institutions 13,163 480
Investment securities available-for-sale 2,579,397 2,542,115
Investment securities held-to-maturity 2,297,909 2,379,668
Total loans, net of allowance for loan losses 8,391,570 8,456,310
Deposits:    
Interest-bearing 4,879,271 4,911,285
Borrowings 951,258 761,887
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Assets    
Interest rate swaps, assets 220  
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   30
Deposits:    
Interest rate swaps, liabilities 220 30
Carrying Value [Member] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   7,222
Deposits:    
Interest rate swaps, liabilities 10,838  
Carrying Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 2,763 517
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 783,920 204,698
Interest-earning balances due from depository institutions 13,163 480
Investment securities available-for-sale 2,579,397 2,542,115
Investment securities held-to-maturity 1,935,898 1,954,345
Total loans, net of allowance for loan losses 8,245,368 8,149,801
Deposits:    
Interest-bearing 4,876,458 4,908,070
Borrowings 914,007 716,566
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 783,920 204,698
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 13,163 480
Investment securities available-for-sale 2,579,397 2,542,115
Investment securities held-to-maturity 1,935,898 1,954,345
Total loans, net of allowance for loan losses 0 0
Deposits:    
Interest-bearing 4,876,458 4,908,070
Borrowings 914,007 716,566
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 0 0
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 8,245,368 8,149,801
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member]    
Assets    
Interest rate swaps, assets 220  
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   30
Deposits:    
Interest rate swaps, liabilities 220 30
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 1 [Member]    
Assets    
Interest rate swaps, assets 0  
Estimated Fair Value [Member] | Derivatives Not 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] | Derivatives Not Designated as Hedging Instruments [Member] | Level 2 [Member]    
Assets    
Interest rate swaps, assets 220  
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 2 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   30
Deposits:    
Interest rate swaps, liabilities 220 30
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 3 [Member]    
Assets    
Interest rate swaps, assets 0  
Estimated Fair Value [Member] | Derivatives Not 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] | Fair Value Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets   7,222
Deposits:    
Interest rate swaps, liabilities 10,838  
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  
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   7,222
Deposits:    
Interest rate swaps, liabilities 10,838  
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  
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 2,763 517
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 1 [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 0 0
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 2,763 517
Estimated Fair Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities $ 0 $ 0