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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				$ 157,240
Current				11,960,284
Total loans	$ 13,786,479			12,117,524
Nonaccrual	147,339	$ 137,611	$ 132,431	126,412
Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	69,967
Current	13,716,512
Total loans	13,786,479		12,122,002
Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,292
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	14,607
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				41,023
Current				2,849,273
Total loans	3,956,422			2,890,296
Nonaccrual	34,895	34,188	40,103	39,036
Commercial | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	5,741
Current	3,751,959
Total loans	3,757,700		2,817,833
Commercial | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans				713,092
Commercial | Commercial Real Estate - Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans				4,453,700
Commercial | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	394
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	893
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	5,946,512			5,166,792
Nonaccrual	76,138	67,859	58,350
Commercial real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	28,287
Current	5,746,524
Total loans	5,774,811		4,890,890
Commercial real estate | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				13,116
Current				699,976
Nonaccrual				12,929
Commercial real estate | Commercial Real Estate - Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				48,107
Current				4,405,593
Nonaccrual				45,038
Commercial real estate | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0
Commercial real estate | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	13,685
BBCC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,551	3,601	4,530
BBCC | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,837
Current	368,586
Total loans	370,423		352,714
BBCC | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	134
BBCC | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				34,523
Current				2,299,766
Total loans	2,248,422			2,334,289
Nonaccrual	24,794	23,914	20,970	21,023
Residential real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	22,601
Current	2,225,821
Total loans	2,248,422		2,334,394
Residential real estate | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0
Residential real estate | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	913,902
Nonaccrual	2,529	2,619	3,318
Indirect | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,674
Current	907,228
Total loans	913,902		935,594
Indirect | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,529
Indirect | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0
Direct
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	164,807
Nonaccrual	1,178	1,264	1,303
Direct | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,712
Current	163,095
Total loans	164,807		228,526
Direct | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	235
Direct | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	29
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	556,414
Nonaccrual	4,254	$ 4,166	3,857
Home equity | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,115
Current	553,299
Total loans	556,414		$ 562,051
Home equity | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0
Home equity | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,635,123			1,726,147
Consumer | Home Equity Line of Credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				5,466
Current				553,555
Total loans				559,021
Nonaccrual				3,785
Consumer | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				12,304
Current				1,004,983
Total loans				1,017,287
Nonaccrual				3,527
Consumer | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				2,701
Current				147,138
Total loans				149,839
Nonaccrual				1,074
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				25,049
30-59 Days Past Due | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	23,447
30-59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				1,489
30-59 Days Past Due | Commercial | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,977
30-59 Days Past Due | Commercial real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	887
30-59 Days Past Due | Commercial real estate | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				187
30-59 Days Past Due | Commercial real estate | Commercial Real Estate - Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				2,223
30-59 Days Past Due | BBCC | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	894
30-59 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				11,054
30-59 Days Past Due | Residential real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	11,639
30-59 Days Past Due | Indirect | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	5,222
30-59 Days Past Due | Direct | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	753
30-59 Days Past Due | Home equity | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,075
30-59 Days Past Due | Consumer | Home Equity Line of Credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				1,020
30-59 Days Past Due | Consumer | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				7,704
30-59 Days Past Due | Consumer | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				1,372
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				5,209
60-89 Days Past Due | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,840
60-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				498
60-89 Days Past Due | Commercial | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	664
60-89 Days Past Due | Commercial real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	128
60-89 Days Past Due | Commercial real estate | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				0
60-89 Days Past Due | Commercial real estate | Commercial Real Estate - Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				665
60-89 Days Past Due | BBCC | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	882
60-89 Days Past Due | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				2,426
60-89 Days Past Due | Residential real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,296
60-89 Days Past Due | Indirect | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	960
60-89 Days Past Due | Direct | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	533
60-89 Days Past Due | Home equity | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	377
60-89 Days Past Due | Consumer | Home Equity Line of Credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				554
60-89 Days Past Due | Consumer | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				919
60-89 Days Past Due | Consumer | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				147
Past Due 90 Days or More
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				570
Past Due 90 Days or More | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	39,680
Past Due 90 Days or More | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				0
Past Due 90 Days or More | Commercial | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,100
Past Due 90 Days or More | Commercial real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	27,272
Past Due 90 Days or More | Commercial real estate | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				0
Past Due 90 Days or More | Commercial real estate | Commercial Real Estate - Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				181
Past Due 90 Days or More | BBCC | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	61
Past Due 90 Days or More | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				20
Past Due 90 Days or More | Residential real estate | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	7,666
Past Due 90 Days or More | Indirect | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	492
Past Due 90 Days or More | Direct | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	426
Past Due 90 Days or More | Home equity | Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 1,663
Past Due 90 Days or More | Consumer | Home Equity Line of Credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				107
Past Due 90 Days or More | Consumer | Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				154
Past Due 90 Days or More | Consumer | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due				$ 108

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