v3.26.1
Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets    
Total cash and cash equivalents $ 1,104,359 $ 376,389
Investment securities available-for-sale 3,457,764 2,683,070
Investment securities held-to-maturity 2,218,529 2,270,391
Net loans and lease finance receivables 11,890,394 8,622,032
Interest rate swaps, assets 29,141 161
Deposits:    
Interest-bearing 7,681,777 5,271,291
Subordinated debt, net 38,973 0
Interest rate swaps, liabilities 589,140 502,031
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 1,104,359 376,389
Interest-earning balances due from depository institutions 749 13,064
Investment securities available-for-sale 3,457,764 2,683,070
Investment securities held-to-maturity 2,218,529 2,270,391
Net loans and lease finance receivables 11,890,394 8,622,032
Equity securities 15,140  
Deposits:    
Interest-bearing 7,681,777 5,271,291
Borrowings 1,063,405 990,601
Subordinated debt, net 38,973  
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 25,321 161
Deposits:    
Interest rate swaps, liabilities 25,321 161
Carrying Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 3,820 8,650
Carrying Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 414 2,619
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 1,104,359 376,389
Interest-earning balances due from depository institutions 749 13,064
Investment securities available-for-sale 3,457,764 2,683,070
Investment securities held-to-maturity 1,867,394 1,925,492
Net loans and lease finance receivables 11,762,758 8,514,750
Equity securities 15,140  
Deposits:    
Interest-bearing 7,677,037 5,268,983
Borrowings 1,002,939 941,735
Subordinated debt, net 38,973  
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 1,104,359 376,389
Interest-earning balances due from depository institutions 0 0
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Net loans and lease finance receivables 0 0
Equity securities 15,140  
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Subordinated debt, net 0  
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 749 13,064
Investment securities available-for-sale 3,457,764 2,683,070
Investment securities held-to-maturity 1,867,394 1,925,492
Net loans and lease finance receivables 0 0
Equity securities 0  
Deposits:    
Interest-bearing 7,677,037 5,268,983
Borrowings 1,002,939 941,735
Subordinated debt, net 38,973  
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
Net loans and lease finance receivables 11,762,758 8,514,750
Equity securities 0  
Deposits:    
Interest-bearing 0 0
Borrowings 0 0
Subordinated debt, net 0  
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 25,321 161
Deposits:    
Interest rate swaps, liabilities 25,321 161
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 25,321 161
Deposits:    
Interest rate swaps, liabilities 25,321 161
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] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 3,820 8,650
Estimated Fair Value [Member] | Fair Value Hedges [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] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 3,820 8,650
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [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] | Interest Rate Swaps [Member]    
Deposits:    
Interest rate swaps, liabilities 414 2,619
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 414 2,619
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