Funds Borrowed - Schedule of Outstanding Balances of Funds Borrowed (Detail) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
2026		$ 919,264
2027		471,104
2028		443,598
2029		214,604
2030		186,054
Thereafter		103,500
Long term debt	[1]	$ 2,338,124	$ 2,376,413
Interest Rate	[2]	4.09%
Deposits [Member]
Debt Instrument [Line Items]
2026	[3]	$ 807,514
2027	[3]	466,604
2028	[3]	389,848
2029	[3]	173,104
2030	[3]	186,054
Thereafter	[3]	0
Long term debt	[1],[3]	$ 2,023,124	2,091,663
Interest Rate	[2],[3]	3.75%
Privately Placed Notes [Member]
Debt Instrument [Line Items]
2026		$ 31,250
2027		0
2028		53,750
2029		39,000
2030		0
Thereafter		22,500
Long term debt	[1]	$ 146,500	146,500
Interest Rate	[2]	8.12%
SBA Debentures and Borrowings [Member]
Debt Instrument [Line Items]
2026		$ 15,500
2027		4,500
2028		0
2029		2,500
2030		0
Thereafter		48,000
Long term debt	[1]	$ 70,500	70,250
Interest Rate	[2]	3.84%
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
2026		$ 0
2027		0
2028		0
2029		0
2030		0
Thereafter		33,000
Long term debt	[1]	$ 33,000	33,000
Interest Rate	[2]	6.69%
Federal Reserve and Other Borrowings [Member]
Debt Instrument [Line Items]
2026		$ 65,000
2027		0
2028		0
2029		0
2030		0
Thereafter		0
Long term debt	[1]	$ 65,000	$ 35,000
Interest Rate	[2]	4.50%

[1] Excludes deferred financing costs of $8.1 million and $8.2 million as of March 31, 2025 and December 31, 2024.

[2] Weighted average contractual rate as of March 31, 2025.

[3] Balance excludes $4.3 million and $3.0 million of strategic partner reserve deposits and includes $5.2 million and $6.0 million in retail savings deposit balances as of March 31, 2025 and December 31, 2024.