Funds Borrowed - Schedule of Outstanding Balances of Funds Borrowed (Detail) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
2025		$ 904,711
2026		438,027
2027		437,522
2028		172,267
2029		241,129
Thereafter		88,250
Long term debt	[1]	$ 2,281,906	$ 2,117,189
Interest Rate	[2]	3.87%
Deposits [Member]
Debt Instrument [Line Items]
2025	[3]	$ 867,211
2026	[3]	391,277
2027	[3]	433,022
2028	[3]	118,517
2029	[3]	199,629
Thereafter	[3]	0
Long term debt	[1],[3]	$ 2,009,656	1,869,439
Interest Rate	[2],[3]	3.50%
Retail And Privately Placed Notes [Member]
Debt Instrument [Line Items]
2025		$ 0
2026		31,250
2027		0
2028		53,750
2029		39,000
Thereafter		17,500
Long term debt	[1]	$ 141,500	139,500
Interest Rate	[2]	8.10%
SBA debentures and borrowings
Debt Instrument [Line Items]
2025		$ 12,500
2026		15,500
2027		4,500
2028		0
2029		2,500
Thereafter		37,750
Long term debt	[1]	$ 72,750	75,250
Interest Rate	[2]	3.54%
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
2025		$ 0
2026		0
2027		0
2028		0
2029		0
Thereafter		33,000
Long term debt	[1]	$ 33,000	33,000
Interest Rate	[2]	7.73%
Federal Reserve and Other Borrowings [Member]
Debt Instrument [Line Items]
2025		$ 25,000
2026		0
2027		0
2028		0
2029		0
Thereafter		0
Long term debt	[1]	$ 25,000	$ 0
Interest Rate	[2]	5.50%

[1] Excludes deferred financing costs of $8.6 million and $8.5 million as of June 30, 2024 and December 31, 2023.

[2] Weighted average contractual rate as of June 30, 2024.

[3] Balance excludes $1.8 million and $1.5 million of strategic partner reserve deposits as of June 30, 2024 and December 31, 2023.