v3.26.3
Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Assets    
Total cash and cash equivalents $ 256,062 $ 376,389
Investment securities available-for-sale 3,527,833 2,683,070
Investment securities held-to-maturity 2,195,292 2,270,391
Net loans and lease finance receivables 11,996,374 8,622,032
Interest rate swaps, assets 55,536 [1] 161
Deposits:    
Interest-bearing 7,313,852 5,271,291
Subordinated debt, net 39,253 0
Interest rate swaps, liabilities 603,614 [2] 502,031
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 256,062 376,389
Interest-earning balances due from depository institutions 490 13,064
Investment securities available-for-sale 3,527,833 2,683,070
Investment securities held-to-maturity 2,195,292 2,270,391
Net loans and lease finance receivables 11,996,374 8,622,032
Equity securities 14,570  
Deposits:    
Interest-bearing 7,313,852 5,271,291
Borrowings 1,111,884 990,601
Subordinated debt, net 39,253  
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 31,674 161
Deposits:    
Interest rate swaps, liabilities 31,674 161
Carrying Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 23,774  
Deposits:    
Interest rate swaps, liabilities   8,650
Carrying Value [Member] | Cash Flow Hedging [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 88  
Deposits:    
Interest rate swaps, liabilities 56 2,619
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 256,062 376,389
Interest-earning balances due from depository institutions 490 13,064
Investment securities available-for-sale 3,527,833 2,683,070
Investment securities held-to-maturity 1,734,484 1,925,492
Net loans and lease finance receivables 11,622,561 8,514,750
Equity securities 14,570  
Deposits:    
Interest-bearing 7,308,345 5,268,983
Borrowings 1,035,777 941,735
Subordinated debt, net 39,404  
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 256,062 376,389
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 14,570  
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 490 13,064
Investment securities available-for-sale 3,527,833 2,683,070
Investment securities held-to-maturity 1,734,484 1,925,492
Net loans and lease finance receivables 0 0
Equity securities 0  
Deposits:    
Interest-bearing 7,308,345 5,268,983
Borrowings 1,035,777 941,735
Subordinated debt, net 39,404  
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 11,622,561 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 31,674 161
Deposits:    
Interest rate swaps, liabilities 31,674 161
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 31,674 161
Deposits:    
Interest rate swaps, liabilities 31,674 161
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]    
Assets    
Interest rate swaps, assets 23,774  
Deposits:    
Interest rate swaps, liabilities   8,650
Estimated Fair Value [Member] | Fair Value Hedges [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 Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] | Interest Rate Swaps [Member]    
Assets    
Interest rate swaps, assets 23,774  
Deposits:    
Interest rate swaps, liabilities   8,650
Estimated Fair Value [Member] | Fair Value Hedges [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]    
Assets    
Interest rate swaps, assets 88  
Deposits:    
Interest rate swaps, liabilities 56 2,619
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 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 88  
Deposits:    
Interest rate swaps, liabilities 56 2,619
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 $ 0
[1] Represents cash collateral received from or pledged with counterparty bank.
[2] Represents the fair value of securities pledged with counterparty bank. Amounts are limited to the derivative asset or liability balance and, accordingly, do not include excess collateral, if any, received or pledged.