Loans and Allowance for Credit Losses - Summary of Amortized Cost Balance of Financial Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 24,197,462		$ 23,172,484
Related Allowance for Credit Losses	242,123	$ 229,979	222,996	$ 224,989	$ 212,850	$ 194,243
Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	13,523		13,090
Amortized Cost of Collateral Dependent Assets with no related Allowance	13,523		13,090
Commercial and Industrial Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	10,233,460		9,929,929
Related Allowance for Credit Losses	150,526	139,824	155,658	163,810	154,484	136,737
Commercial and Industrial Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	5,266		7,033
Amortized Cost of Collateral Dependent Assets with no related Allowance	5,266		7,033
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	10,074,013		9,732,083
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	5,266		7,033
Amortized Cost of Collateral Dependent Assets with no related Allowance	5,266		7,033
Commercial and Industrial Portfolio [Member] | Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	151,123		194,368
Specialty Lending Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	524,242		498,786
Related Allowance for Credit Losses					922
Specialty Lending Portfolio [Member] | Asset-based Lending [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	524,242		498,786
Commercial Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	9,449,613		8,893,926
Related Allowance for Credit Losses	68,862	66,291	45,507	42,192	40,514	39,370
Commercial Real Estate Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	788		900
Amortized Cost of Collateral Dependent Assets with no related Allowance	788		900
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,138,664		2,138,705
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	514		632
Amortized Cost of Collateral Dependent Assets with no related Allowance	514		632
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,468,739		3,272,549
Commercial Real Estate Portfolio [Member] | Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	509,794		505,982
Commercial Real Estate Portfolio [Member] | Farmland [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	152		175
Amortized Cost of Collateral Dependent Assets with no related Allowance	152		175
Commercial Real Estate Portfolio [Member] | 5+ Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	511,915		364,063
Commercial Real Estate Portfolio [Member] | 1-4 Family Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	107,765		107,367
Commercial Real Estate Portfolio [Member] | General Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,712,736		2,505,260
Commercial Real Estate Portfolio [Member] | General Construction [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	122		93
Amortized Cost of Collateral Dependent Assets with no related Allowance	122		93
Consumer Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,021,288		2,960,632
Related Allowance for Credit Losses	3,567	3,399	6,941	6,527	5,616	6,148
Consumer Real Estate Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	7,416		5,058
Amortized Cost of Collateral Dependent Assets with no related Allowance	7,416		5,058
Consumer Real Estate Portfolio [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	373,692		362,806
Consumer Real Estate Portfolio [Member] | HELOC [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,301		1,437
Amortized Cost of Collateral Dependent Assets with no related Allowance	1,301		1,437
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,603,786		2,559,007
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	6,022		3,519
Amortized Cost of Collateral Dependent Assets with no related Allowance	6,022		3,519
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	43,810		38,819
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	93		102
Amortized Cost of Collateral Dependent Assets with no related Allowance	93		102
Consumer Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	159,168		163,291
Related Allowance for Credit Losses	632	531	1,089	417	453	494
Consumer Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	53		28
Amortized Cost of Collateral Dependent Assets with no related Allowance	53		28
Consumer Portfolio [Member] | Revolving Line [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	79,801		56,320
Consumer Portfolio [Member] | Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	23,911		24,860
Consumer Portfolio [Member] | Auto [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	39		14
Amortized Cost of Collateral Dependent Assets with no related Allowance	39		14
Consumer Portfolio [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	55,456		82,111
Consumer Portfolio [Member] | Other [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	14		14
Amortized Cost of Collateral Dependent Assets with no related Allowance	14		14
Leases and Other Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	240,423		301,964
Related Allowance for Credit Losses	1,644	$ 1,557	2,608	$ 1,984	$ 2,049	$ 2,221
Leases and Other Portfolio [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans			71
Amortized Cost of Collateral Dependent Assets with no related Allowance			71
Leases and Other Portfolio [Member] | Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,681		1,716
Leases and Other Portfolio [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 238,742		300,248
Leases and Other Portfolio [Member] | Other [Member] | Collateral Dependent Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans			71
Amortized Cost of Collateral Dependent Assets with no related Allowance			$ 71