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Loans and Allowance for Credit Losses - Summary of Amortized Cost Balance of Each of Loan Classes Disaggregated by Collateral Type and Origination Year (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	$ 4,361,376	$ 6,232,622
Amortized Cost Basis by Origination Year 2020	3,940,138	2,122,556
Amortized Cost Basis by Origination Year 2019	1,859,737	1,075,973
Amortized Cost Basis by Origination Year 2018	780,145	694,095
Amortized Cost Basis by Origination Year 2017	480,091	786,120
Amortized Cost Basis by Origination Year Prior to 2017	860,695	481,977
Amortized Cost - Revolving Loans	4,169,620	4,459,302
Amortized Cost - Revolving Loans Converted to Term Loans	17,661	251,006
Total Loans	16,469,463	16,103,651
Commercial and Industrial Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	2,064,492	3,194,475
Amortized Cost Basis by Origination Year 2020	1,116,045	690,983
Amortized Cost Basis by Origination Year 2019	404,651	473,926
Amortized Cost Basis by Origination Year 2018	172,397	188,818
Amortized Cost Basis by Origination Year 2017	140,779	180,740
Amortized Cost Basis by Origination Year Prior to 2017	154,439	70,015
Amortized Cost - Revolving Loans	2,803,024	2,263,079
Amortized Cost - Revolving Loans Converted to Term Loans	416	38
Total Loans	6,856,243	7,062,074
Commercial and Industrial Portfolio [Member] | Equipment/Accounts Receivable/Inventory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	2,057,294	3,185,589
Amortized Cost Basis by Origination Year 2020	1,109,567	684,488
Amortized Cost Basis by Origination Year 2019	400,896	471,950
Amortized Cost Basis by Origination Year 2018	171,666	185,167
Amortized Cost Basis by Origination Year 2017	140,122	178,576
Amortized Cost Basis by Origination Year Prior to 2017	153,229	69,599
Amortized Cost - Revolving Loans	2,676,909	2,108,799
Amortized Cost - Revolving Loans Converted to Term Loans	406
Total Loans	6,710,089	6,884,168
Commercial and Industrial Portfolio [Member] | Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	7,198	8,886
Amortized Cost Basis by Origination Year 2020	6,478	6,495
Amortized Cost Basis by Origination Year 2019	3,755	1,976
Amortized Cost Basis by Origination Year 2018	731	3,651
Amortized Cost Basis by Origination Year 2017	657	2,164
Amortized Cost Basis by Origination Year Prior to 2017	1,210	416
Amortized Cost - Revolving Loans	121,099	137,955
Amortized Cost - Revolving Loans Converted to Term Loans	10	38
Total Loans	141,138	161,581
Commercial and Industrial Portfolio [Member] | Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost - Revolving Loans	5,016	16,325
Total Loans	5,016	16,325
Specialty Lending Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	10,245	64,258
Amortized Cost Basis by Origination Year 2020	52,950
Amortized Cost - Revolving Loans	445,236	447,042
Total Loans	508,431	511,300
Specialty Lending Portfolio [Member] | Asset-based Lending [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	10,245	64,258
Amortized Cost Basis by Origination Year 2020	52,950
Amortized Cost - Revolving Loans	330,541	291,091
Total Loans	393,736	355,349
Specialty Lending Portfolio [Member] | Factoring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost - Revolving Loans	114,695	155,951
Total Loans	114,695	155,951
Commercial Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	1,596,057	1,934,548
Amortized Cost Basis by Origination Year 2020	1,930,505	1,085,218
Amortized Cost Basis by Origination Year 2019	1,165,051	499,245
Amortized Cost Basis by Origination Year 2018	515,246	410,603
Amortized Cost Basis by Origination Year 2017	265,819	522,903
Amortized Cost Basis by Origination Year Prior to 2017	585,448	330,646
Amortized Cost - Revolving Loans	89,645	874,808
Amortized Cost - Revolving Loans Converted to Term Loans	7,737	250,963
Total Loans	6,155,508	5,908,934
Commercial Real Estate Portfolio [Member] | Owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	498,622	579,212
Amortized Cost Basis by Origination Year 2020	542,847	334,098
Amortized Cost Basis by Origination Year 2019	269,721	233,192
Amortized Cost Basis by Origination Year 2018	216,268	170,913
Amortized Cost Basis by Origination Year 2017	101,140	120,603
Amortized Cost Basis by Origination Year Prior to 2017	190,136	176,377
Amortized Cost - Revolving Loans	10,983	18,880
Amortized Cost - Revolving Loans Converted to Term Loans	638	51,910
Total Loans	1,830,355	1,685,185
Commercial Real Estate Portfolio [Member] | Non-owner-occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	703,825	846,030
Amortized Cost Basis by Origination Year 2020	732,878	630,457
Amortized Cost Basis by Origination Year 2019	701,884	230,549
Amortized Cost Basis by Origination Year 2018	183,984	169,193
Amortized Cost Basis by Origination Year 2017	110,260	333,215
Amortized Cost Basis by Origination Year Prior to 2017	321,302	115,753
Amortized Cost - Revolving Loans	7,769	49,384
Amortized Cost - Revolving Loans Converted to Term Loans		97,954
Total Loans	2,761,902	2,472,535
Commercial Real Estate Portfolio [Member] | Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	58,698	297,788
Amortized Cost Basis by Origination Year 2020	279,047	37,288
Amortized Cost Basis by Origination Year 2019	36,083	31,454
Amortized Cost Basis by Origination Year 2018	17,411	37,485
Amortized Cost Basis by Origination Year 2017	22,356	28,925
Amortized Cost Basis by Origination Year Prior to 2017	36,841	29,480
Amortized Cost - Revolving Loans	33,345	40,043
Total Loans	483,781	502,463
Commercial Real Estate Portfolio [Member] | 5+ Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	30,346	190,922
Amortized Cost Basis by Origination Year 2020	97,479	80,293
Amortized Cost Basis by Origination Year 2019	47,900	2,835
Amortized Cost Basis by Origination Year 2018	29,164	32,498
Amortized Cost Basis by Origination Year 2017	1,894	39,802
Amortized Cost Basis by Origination Year Prior to 2017	36,866	6,298
Amortized Cost - Revolving Loans	1,408	2,418
Amortized Cost - Revolving Loans Converted to Term Loans		94,789
Total Loans	245,057	449,855
Commercial Real Estate Portfolio [Member] | 1-4 Family Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	36,871	144
Amortized Cost Basis by Origination Year 2020	10,054
Amortized Cost Basis by Origination Year 2019	16,215
Amortized Cost - Revolving Loans	470	30,131
Total Loans	63,610	30,275
Commercial Real Estate Portfolio [Member] | General Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	267,695	20,452
Amortized Cost Basis by Origination Year 2020	268,200	3,082
Amortized Cost Basis by Origination Year 2019	93,248	1,215
Amortized Cost Basis by Origination Year 2018	68,419	514
Amortized Cost Basis by Origination Year 2017	30,169	358
Amortized Cost Basis by Origination Year Prior to 2017	303	2,738
Amortized Cost - Revolving Loans	35,670	733,952
Amortized Cost - Revolving Loans Converted to Term Loans	7,099	6,310
Total Loans	770,803	768,621
Consumer Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	655,705	988,228
Amortized Cost Basis by Origination Year 2020	782,232	321,636
Amortized Cost Basis by Origination Year 2019	225,150	90,052
Amortized Cost Basis by Origination Year 2018	66,480	89,415
Amortized Cost Basis by Origination Year 2017	63,785	79,469
Amortized Cost Basis by Origination Year Prior to 2017	118,121	79,439
Amortized Cost - Revolving Loans	328,041	297,250
Amortized Cost - Revolving Loans Converted to Term Loans	6,185	5
Total Loans	2,245,699	1,945,494
Consumer Real Estate Portfolio [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	439	82,410
Amortized Cost Basis by Origination Year 2020	501	11,236
Amortized Cost Basis by Origination Year 2019	339	4,263
Amortized Cost Basis by Origination Year 2018	592	241
Amortized Cost Basis by Origination Year 2017	722	63
Amortized Cost Basis by Origination Year Prior to 2017	7,105	2,561
Amortized Cost - Revolving Loans	327,965	294,390
Amortized Cost - Revolving Loans Converted to Term Loans	6,185	5
Total Loans	343,848	395,169
Consumer Real Estate Portfolio [Member] | First Lien: 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	649,364	896,676
Amortized Cost Basis by Origination Year 2020	775,112	304,017
Amortized Cost Basis by Origination Year 2019	220,794	83,429
Amortized Cost Basis by Origination Year 2018	64,550	87,927
Amortized Cost Basis by Origination Year 2017	62,212	78,458
Amortized Cost Basis by Origination Year Prior to 2017	109,611	75,408
Amortized Cost - Revolving Loans	61	2,579
Total Loans	1,881,704	1,528,494
Consumer Real Estate Portfolio [Member] | Junior Lien: 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	5,902	9,142
Amortized Cost Basis by Origination Year 2020	6,619	6,383
Amortized Cost Basis by Origination Year 2019	4,017	2,360
Amortized Cost Basis by Origination Year 2018	1,338	1,247
Amortized Cost Basis by Origination Year 2017	851	948
Amortized Cost Basis by Origination Year Prior to 2017	1,405	1,470
Amortized Cost - Revolving Loans	15	281
Total Loans	20,147	21,831
Consumer Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	13,532	17,487
Amortized Cost Basis by Origination Year 2020	11,203	13,046
Amortized Cost Basis by Origination Year 2019	8,517	5,091
Amortized Cost Basis by Origination Year 2018	3,154	1,861
Amortized Cost Basis by Origination Year 2017	3,097	1,685
Amortized Cost Basis by Origination Year Prior to 2017	1,126	520
Amortized Cost - Revolving Loans	71,553	78,296
Amortized Cost - Revolving Loans Converted to Term Loans	3,323
Total Loans	115,505	117,986
Consumer Portfolio [Member] | Revolving Line [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	735
Amortized Cost - Revolving Loans	66,695	65,215
Amortized Cost - Revolving Loans Converted to Term Loans	3,323
Total Loans	70,753	65,215
Consumer Portfolio [Member] | Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	8,978	12,470
Amortized Cost Basis by Origination Year 2020	9,244	9,846
Amortized Cost Basis by Origination Year 2019	6,391	2,960
Amortized Cost Basis by Origination Year 2018	1,530	1,645
Amortized Cost Basis by Origination Year 2017	693	680
Amortized Cost Basis by Origination Year Prior to 2017	314	348
Total Loans	27,150	27,949
Consumer Portfolio [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	3,819	5,017
Amortized Cost Basis by Origination Year 2020	1,959	3,200
Amortized Cost Basis by Origination Year 2019	2,126	2,131
Amortized Cost Basis by Origination Year 2018	1,624	216
Amortized Cost Basis by Origination Year 2017	2,404	1,005
Amortized Cost Basis by Origination Year Prior to 2017	812	172
Amortized Cost - Revolving Loans	4,858	13,081
Total Loans	17,602	24,822
Credit Cards Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost - Revolving Loans	393,093	366,968
Total Loans	393,093	366,968
Credit Cards Portfolio [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost - Revolving Loans	173,911	188,681
Total Loans	173,911	188,681
Credit Cards Portfolio [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost - Revolving Loans	219,182	178,287
Total Loans	219,182	178,287
Leases and Other Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	21,345	33,626
Amortized Cost Basis by Origination Year 2020	47,203	11,673
Amortized Cost Basis by Origination Year 2019	56,368	7,659
Amortized Cost Basis by Origination Year 2018	22,868	3,398
Amortized Cost Basis by Origination Year 2017	6,611	1,323
Amortized Cost Basis by Origination Year Prior to 2017	1,561	1,357
Amortized Cost - Revolving Loans	39,028	131,859
Total Loans	194,984	190,895
Leases and Other Portfolio [Member] | Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2020		915
Amortized Cost Basis by Origination Year 2019	813
Amortized Cost Basis by Origination Year 2018		787
Amortized Cost Basis by Origination Year 2017	739
Amortized Cost Basis by Origination Year Prior to 2017	643	711
Total Loans	2,195	2,413
Leases and Other Portfolio [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis by Origination Year 2021	21,345	33,626
Amortized Cost Basis by Origination Year 2020	47,203	10,758
Amortized Cost Basis by Origination Year 2019	55,555	7,659
Amortized Cost Basis by Origination Year 2018	22,868	2,611
Amortized Cost Basis by Origination Year 2017	5,872	1,323
Amortized Cost Basis by Origination Year Prior to 2017	918	646
Amortized Cost - Revolving Loans	39,028	131,859
Total Loans	$ 192,789	$ 188,482

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