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Loans and ACL - Summary of Amortized Cost of TLMs (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 3,372	$ 9,102		$ 3,801	$ 50,989
Term Extension and Forbearance	0			804
Payment Deferral	299			643
Total	299			1,447
Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 2,150	8,805		2,188	38,958
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%
Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 1,222	0		1,613	8,805
Interest-only [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment		297			3,226
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Term Extension and Forbearance	0		$ 0	350
Payment Deferral	225			569
Commercial and Industrial [Member] | Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 335	$ 5,806	$ 32,800	$ 335	$ 32,750
Recorded Investment of Modified Loans to Gross Loans by Category	0.09%	1.09%		0.09%	6.14%
Amortized Cost of Modified Loans to Gross Loans by Category				0.09%
Commercial and Industrial [Member] | Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 644	$ 0		$ 1,024	$ 5,806
Recorded Investment of Modified Loans to Gross Loans by Category	0.17%	0.00%		0.27%	0.66%
Amortized Cost of Modified Loans to Gross Loans by Category	0.06%			0.15%
Commercial and Industrial [Member] | Interest-only [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment		$ 297			$ 2,982
Recorded Investment of Modified Loans to Gross Loans by Category		0.06%			0.34%
Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Term Extension and Forbearance	$ 0			$ 299
Payment Deferral	$ 74			74
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%
Commercial [Member] | Term extension and Forbearance [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 1,743	$ 2,999		$ 1,781	$ 6,208
Recorded Investment of Modified Loans to Gross Loans by Category	0.20%	0.34%		0.20%	0.71%
Amortized Cost of Modified Loans to Gross Loans by Category				0.03%
Commercial [Member] | Payment Deferral [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 74	$ 0		$ 74	$ 2,999
Recorded Investment of Modified Loans to Gross Loans by Category	0.01%	0.00%		0.01%	0.34%
Amortized Cost of Modified Loans to Gross Loans by Category	0.01%			0.01%
Commercial [Member] | Interest-only [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment		$ 0			$ 244
Recorded Investment of Modified Loans to Gross Loans by Category		0.00%			0.03%
Residential [Member] | Term extension and Forbearance [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 72			$ 72
Recorded Investment of Modified Loans to Gross Loans by Category	0.01%			0.01%
Residential [Member] | Payment Deferral [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 504			$ 504
Recorded Investment of Modified Loans to Gross Loans by Category	0.07%			0.07%
Construction, Residential [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Term Extension and Forbearance	$ 0			$ 155
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%
Construction, Residential [Member] | Term extension and Forbearance [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized Cost of Modified Loans to Gross Loans by Category				0.36%
Consumer loans [Member] | Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 0			$ 11
Recorded Investment of Modified Loans to Gross Loans by Category	0.00%			0.02%

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