Loans and Allowance for Credit Losses - Summary of Amortized Cost Balance of Financial Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 35,936,281	$ 25,642,301
Related Allowance for Credit Losses	373,488	261,734	$ 229,979	$ 222,996
Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	97,157	19,037
Amortized Cost of Collateral Dependent Assets with no related Allowance	97,157	19,037
Commercial and Industrial Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	14,035,462	10,901,502
Related Allowance for Credit Losses	192,146	160,912	139,824	155,658
Commercial and Industrial Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12,585	4,423
Amortized Cost of Collateral Dependent Assets with no related Allowance	12,585	4,423
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,622,883	10,711,907
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,298	4,423
Amortized Cost of Collateral Dependent Assets with no related Allowance	11,298	4,423
Commercial and Industrial Portfolio [Member] | Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	408,234	178,368
Commercial and Industrial Portfolio [Member] | Agriculture [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,287
Amortized Cost of Collateral Dependent Assets with no related Allowance	1,287
Specialty Lending Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	542,089	469,194
Specialty Lending Portfolio [Member] | Asset-based Lending [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	542,089	469,194
Commercial Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,998,750	10,131,285
Related Allowance for Credit Losses	149,345	77,340	66,291	45,507
Commercial Real Estate Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	61,132	960
Amortized Cost of Collateral Dependent Assets with no related Allowance	61,132	960
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,358,434	2,265,071
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	17,558	707
Amortized Cost of Collateral Dependent Assets with no related Allowance	17,558	707
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,758,922	3,807,854
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	34,637
Amortized Cost of Collateral Dependent Assets with no related Allowance	34,637
Commercial Real Estate Portfolio [Member] | Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	894,595	510,543
Commercial Real Estate Portfolio [Member] | Farmland [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,273	135
Amortized Cost of Collateral Dependent Assets with no related Allowance	2,273	135
Commercial Real Estate Portfolio [Member] | 5+ Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,197,375	823,913
Commercial Real Estate Portfolio [Member] | 1-4 Family Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	101,798	47,486
Commercial Real Estate Portfolio [Member] | General Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,687,626	2,676,418
Commercial Real Estate Portfolio [Member] | General Construction [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,664	118
Amortized Cost of Collateral Dependent Assets with no related Allowance	6,664	118
Consumer Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,189,686	3,187,130
Related Allowance for Credit Losses	4,798	4,327	3,399	6,941
Consumer Real Estate Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	23,291	13,614
Amortized Cost of Collateral Dependent Assets with no related Allowance	23,291	13,614
Consumer Real Estate Portfolio [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	681,996	399,721
Consumer Real Estate Portfolio [Member] | HELOC [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,045	2,211
Amortized Cost of Collateral Dependent Assets with no related Allowance	5,045	2,211
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,373,642	2,745,257
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	17,653	11,240
Amortized Cost of Collateral Dependent Assets with no related Allowance	17,653	11,240
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	134,048	42,152
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	593	163
Amortized Cost of Collateral Dependent Assets with no related Allowance	593	163
Consumer Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	328,482	193,860
Related Allowance for Credit Losses	1,488	966	531	1,089
Consumer Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	149	40
Amortized Cost of Collateral Dependent Assets with no related Allowance	149	40
Consumer Portfolio [Member] | Revolving Line [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	153,026	101,442
Consumer Portfolio [Member] | Revolving Line [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	58
Amortized Cost of Collateral Dependent Assets with no related Allowance	58
Consumer Portfolio [Member] | Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	41,470	22,414
Consumer Portfolio [Member] | Auto [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	51	19
Amortized Cost of Collateral Dependent Assets with no related Allowance	51	19
Consumer Portfolio [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	133,986	70,004
Consumer Portfolio [Member] | Other [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	40	21
Amortized Cost of Collateral Dependent Assets with no related Allowance	40	21
Leases and Other Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	164,779	180,564
Related Allowance for Credit Losses	1,150	1,272	$ 1,557	$ 2,608
Leases and Other Portfolio [Member] | Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,469	1,492
Leases and Other Portfolio [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 163,310	$ 179,072