LOANS HELD FOR INVESTMENT - Selected Information on TDRs includes Recorded Investment by Loan Class and Modification Type (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 4,143		$ 37,965
Post-Modification Outstanding Recorded Investment		$ 2,988		$ 18,553
Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 401		$ 1,536
Percentage of Total by Portfolio Classes	0.01%		0.05%
Post-Modification Outstanding Recorded Investment		1,154		5,598
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 192		$ 377
Percentage of Total by Portfolio Classes	0.01%		0.01%
Post-Modification Outstanding Recorded Investment		495		2,803
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 2,225		$ 32,395
Percentage of Total by Portfolio Classes	0.10%		1.40%
Post-Modification Outstanding Recorded Investment		0		5,890
Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0		$ 0
Percentage of Total by Portfolio Classes	0.00%		0.00%
Post-Modification Outstanding Recorded Investment		0		0
Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 741		$ 1,898
Percentage of Total by Portfolio Classes	0.04%		0.10%
Post-Modification Outstanding Recorded Investment		787		2,510
Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		82		469
Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 154		$ 297
Percentage of Total by Portfolio Classes	0.04%		0.08%
Post-Modification Outstanding Recorded Investment		133		318
Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 368		$ 1,033
Percentage of Total by Portfolio Classes	0.11%		0.32%
Post-Modification Outstanding Recorded Investment		252		647
Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 62		$ 429
Percentage of Total by Portfolio Classes	0.04%		0.28%
Post-Modification Outstanding Recorded Investment		85		318
Forbearance [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 0		$ 0
Forbearance [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Forbearance [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Forbearance [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Forbearance [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Forbearance [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Forbearance [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Forbearance [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Forbearance [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Payment Plan [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Trial Modification [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	401		610
Trial Modification [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	401		610
Trial Modification [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Trial Modification [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Trial Modification [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Trial Modification [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Trial Modification [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Trial Modification [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Trial Modification [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Interest Rate Reduction [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	560		1,225
Post-Modification Outstanding Recorded Investment		1,418		4,069
Interest Rate Reduction [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		215
Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	192		192
Post-Modification Outstanding Recorded Investment		495		895
Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Interest Rate Reduction [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Interest Rate Reduction [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		661		2,120
Interest Rate Reduction [Member] | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Interest Rate Reduction [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		99
Interest Rate Reduction [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	368		1,033
Post-Modification Outstanding Recorded Investment		252		647
Interest Rate Reduction [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		10		93
Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	2,420		3,774
Post-Modification Outstanding Recorded Investment		387		2,629
Term Extension [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		687
Post-Modification Outstanding Recorded Investment		132		1,484
Term Extension [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		185
Post-Modification Outstanding Recorded Investment		0		0
Term Extension [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	2,225		2,225
Post-Modification Outstanding Recorded Investment		0		245
Term Extension [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Term Extension [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	74		234
Post-Modification Outstanding Recorded Investment		42		126
Term Extension [Member] | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		82		451
Term Extension [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	67		132
Post-Modification Outstanding Recorded Investment		75		135
Term Extension [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Term Extension [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	54		311
Post-Modification Outstanding Recorded Investment		56		188
Combination Of Interest Rate Reduction And Term Extension [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	150		30,817
Post-Modification Outstanding Recorded Investment		142		5,716
Combination Of Interest Rate Reduction And Term Extension [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		239
Post-Modification Outstanding Recorded Investment		0		190
Combination Of Interest Rate Reduction And Term Extension [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Combination Of Interest Rate Reduction And Term Extension [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		30,170
Post-Modification Outstanding Recorded Investment		0		5,178
Combination Of Interest Rate Reduction And Term Extension [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Combination Of Interest Rate Reduction And Term Extension [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	59		153
Post-Modification Outstanding Recorded Investment		84		264
Combination Of Interest Rate Reduction And Term Extension [Member] | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Combination Of Interest Rate Reduction And Term Extension [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	87		165
Post-Modification Outstanding Recorded Investment		58		84
Combination Of Interest Rate Reduction And Term Extension [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Combination Of Interest Rate Reduction And Term Extension [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	4		90
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		19		862
Forgiveness Of Principal And/Or Interest [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		825
Forgiveness Of Principal And/Or Interest [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member] | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Forgiveness Of Principal And/Or Interest [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		19		37
Other Loan Modifications [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	612		1,539
Post-Modification Outstanding Recorded Investment		1,022		5,277
Other Loan Modifications [Member] | Residential Portfolio Segment [Member] | Conventional Loan [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		1,022		3,709
Other Loan Modifications [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		1,083
Other Loan Modifications [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		467
Other Loan Modifications [Member] | Construction loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Other Loan Modifications [Member] | Auto loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	608		1,511
Post-Modification Outstanding Recorded Investment		0		0
Other Loan Modifications [Member] | Finance Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Post-Modification Outstanding Recorded Investment		0		18
Other Loan Modifications [Member] | Personal Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Other Loan Modifications [Member] | Credit Card Receivables [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	0		0
Post-Modification Outstanding Recorded Investment		0		0
Other Loan Modifications [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable Modifications [Line Items]
Loans modified to borrowers experiencing financial difficulty	$ 4		$ 28
Post-Modification Outstanding Recorded Investment		$ 0		$ 0