Fair Value Measurements - Schedule of Additional Information about Financial Assets and Liabilities Measured at Fair Value Utilized Level 3 (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Loans Held For Sale [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	$ 51,978	$ 44,871
Originations	149,142	1,156,616
Sales	(165,006)	(1,179,612)
Transfers in other	0	0
Total gains during the period recognized in earnings	4,148	30,103
Balance, end of period	40,262	51,978
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	(813)	1,142
Derivative Financial Assets Tba Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	0	26
Originations	0	0
Sales	0	0
Transfers in other	16	(26)
Total gains during the period recognized in earnings	0	0
Balance, end of period	16	0
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	16	0
Derivative Financial Assets Forward Sales Commitments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	33	6
Originations	0	0
Sales	0	0
Transfers in other	(28)	27
Total gains during the period recognized in earnings	0	0
Balance, end of period	5	33
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	5	33
Interest Rate Lock Commitments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	1,005	844
Originations	0	0
Sales	0	0
Transfers in other	131	161
Total gains during the period recognized in earnings	0	0
Balance, end of period	1,136	1,005
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	1,136	1,005
Derivative Financial Liabilities Tba Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	667	213
Originations	0	0
Sales	0	0
Transfers in other	(644)	454
Total gains during the period recognized in earnings	0	0
Balance, end of period	23	667
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	23	667
Derivative Financial Liabilities Interest Rate Lock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	0	348
Originations	0	0
Sales	0	0
Transfers in other	3	(348)
Total gains during the period recognized in earnings	0	0
Balance, end of period	3	0
The amount of total (Losses) gains for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	$ 3	$ 0