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Loans and Allowance for Credit Losses - Schedule of Activity in Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	$ 32,653	$ 31,738
(Charge-offs)/ Recoveries	15	(1,961)
(Payments)/ Disbursements	(1,931)	(1,103)
(Removals)/ Additions	(1,171)	0
Ending Balance	29,566	28,674
Commercial
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	11,090	12,412
(Charge-offs)/ Recoveries	0	(695)
(Payments)/ Disbursements	(1,448)	(789)
(Removals)/ Additions	(1,171)	0
Ending Balance	8,471	10,928
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	17,606	14,277
(Charge-offs)/ Recoveries	8	(1,272)
(Payments)/ Disbursements	(229)	(157)
(Removals)/ Additions	0	0
Ending Balance	17,385	12,848
BBCC
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	112	578
(Charge-offs)/ Recoveries	3	0
(Payments)/ Disbursements	(10)	(16)
(Removals)/ Additions	0	0
Ending Balance	105	562
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	2,824	3,107
(Charge-offs)/ Recoveries	0	0
(Payments)/ Disbursements	(221)	(67)
(Removals)/ Additions	0	0
Ending Balance	2,603	3,040
Indirect
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	0	0
(Charge-offs)/ Recoveries	2	3
(Payments)/ Disbursements	(2)	(3)
(Removals)/ Additions	0	0
Ending Balance	0	0
Direct
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	739	983
(Charge-offs)/ Recoveries	1	2
(Payments)/ Disbursements	(14)	(63)
(Removals)/ Additions	0	0
Ending Balance	726	922
Home equity
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Beginning Balance	282	381
(Charge-offs)/ Recoveries	1	1
(Payments)/ Disbursements	(7)	(8)
(Removals)/ Additions	0	0
Ending Balance	$ 276	$ 374

X

- Definition

Amount of new troubled debt restructurings during the period.

+ References

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- Definition

Financing receivables impaired troubled debt restructuring payments disbursements.

+ References

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- Definition

Financing Receivable, Troubled Debt Restructuring

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- Definition

Financing receivables impaired troubled debt restructuring write down recoveries.

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X

- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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