Funds Borrowed - Additional Information (Detail) - USD ($) $ in Thousands								1 Months Ended		3 Months Ended		12 Months Ended
		Feb. 28, 2024	Sep. 30, 2023	Jul. 10, 2023	Feb. 28, 2021	Dec. 31, 2007	Jun. 30, 2007	Jan. 31, 2024	Dec. 31, 2020	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2019	Apr. 30, 2021	Mar. 15, 2021	Aug. 31, 2019	Mar. 31, 2019	Dec. 31, 2017	Mar. 01, 2017
Debt Instrument [Line Items]
Time deposits										$ 1,883,346
Listing services deposits from other financial institutions.										12,100		$ 11,800
Retail savings deposit balance										12,400		$ 14,900
Aggregate principal amount																$ 6,000
Maturity date			Sep. 30, 2028		Feb. 28, 2026							Dec. 21, 2033
Principal amount outstanding repaid										3,000
Gain loss on sales of loans net										$ 588	$ 1,855
Issue of common stock										29,243,878		29,051,800
Preferred securities repurchased from a third party investor						$ 2,000
Long-term debt	[1]									$ 225,558		$ 235,544
Investment securities pledged										53,038		54,282
Medallion Capital, Inc.
Debt Instrument [Line Items]
Debt instrument face amount		$ 18,500		$ 20,000
Long-term debt		18,500								2,200
Debt instrument leverage fee		200		200
Debt instrument, additional leverage fee		400		$ 400
Line Of Credit Facility Drawn Amount										9,800
Line Of Credit Facility Drawable Amount										8,000
Long term debt under capital infusion		$ 9,300								$ 1,100
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Maturity date										Sep. 30, 2037
Sale of preferred securities							$ 35,000
Issue of common stock							1,083
Preferred securities outstanding										$ 33,000
Trust Preferred Securities [Member] | SOFR Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate										2.13%
Description of variable rate basis										26 basis points
Trust Preferred Securities [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Aggregate principal amount of unsecured junior subordinated notes							$ 36,100
SBA debentures and borrowings
Debt Instrument [Line Items]
Debt instrument interest rate Percentage										3.25%
Loan commitment term										4 years 6 months
Commitment fee percentage										1.00%
Principal amount of loan																		$ 34,000	$ 34,000
Extended maturity date										Apr. 30, 2024
Freshstart Venture Capital Corp [Member]
Debt Instrument [Line Items]
Principal amount of loan																		$ 33,500
Other Borrowings [Member]
Debt Instrument [Line Items]
Borrowings										$ 20,000
Line of credit facility, amount outstanding										0
Federal reserve discount window and other borrowings [Member]
Debt Instrument [Line Items]
Borrowings										0
Investment securities pledged										$ 36,900
Pledged securities advance rate of fair value										100.00%
Borrowing capacity										$ 36,900
Commercial Banks [Member]
Debt Instrument [Line Items]
Borrowing capacity										$ 75,000
7.25% Unsecured Senior Notes Due February Two Thousand And Twenty Six [Member]
Debt Instrument [Line Items]
Aggregate principal amount														$ 3,000	$ 3,300
7.50% Percentage Unsecured Senior Notes Due December Two Thousand And Twenty Seven [Member]
Debt Instrument [Line Items]
Aggregate principal amount														$ 11,700
Privately Placed Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount			$ 39,000		$ 25,000				$ 33,600			$ 12,500			$ 8,500		$ 30,000
Debt instrument interest rate Percentage			9.25%		7.25%				7.50%			9.00%					8.25%
Maturity date										2024		2024
Maturity date									Dec. 31, 2027
Repurchase amount			$ 33,000														$ 33,000
Gain loss on sales of loans net													$ 4,100
Revolving Credit Facility [Member] | Other Borrowings [Member]
Debt Instrument [Line Items]
Debt instrument interest rate Percentage								2.75%
Commitment fee percentage								0.10%
Borrowing capacity								$ 7,500
Minimum [Member]
Debt Instrument [Line Items]
Time deposits										$ 250,000
Brokerage [Member] | Maximum [Member]
Debt Instrument [Line Items]
Average brokerage fee percentage in relation to the maturity of deposits										0.15%

[1] Includes $4.2 million of deferred financing costs as of both March 31, 2024 and December 31, 2023. Refer to Note 5 for more details.