Fair Value of Financial Instruments - Hierarchy Table on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial assets
Investment securities available-for-sale, at fair value	$ 2,661,079	$ 4,273,864
Total derivative assets	83,860	11,989
Financial liabilities
Total derivative liabilities	12,773	5,263
U.S. Treasury
Financial assets
Investment securities available-for-sale, at fair value	46,774	57,866
Agency
Financial assets
Investment securities available-for-sale, at fair value	430,863	432,135
Corporate debt
Financial assets
Investment securities available-for-sale, at fair value	555,750	453,861
Municipal bonds
Financial assets
Investment securities available-for-sale, at fair value		1,089,913
Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	791,115	676,643
Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	836,577	1,563,446
Level 1
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities with readily determinable fair values	1,035
Total derivative assets	15	0
Financial liabilities
Total derivative liabilities	7	0
Level 2
Financial assets
Investment securities available-for-sale, at fair value	2,661,079	4,273,864
Equity securities with readily determinable fair values	0
Total derivative assets	8,033	10,100
Financial liabilities
Total derivative liabilities	12,766	5,263
Level 3
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities with readily determinable fair values	0
Total derivative assets	1,911	1,889
Financial liabilities
Total derivative liabilities	0	0
Recurring
Financial assets
Investment securities available-for-sale, at fair value	2,661,079	4,273,864
Equity securities with readily determinable fair values	1,035
Total derivative assets	9,959	11,989
Financial liabilities
Total derivative liabilities	12,773
Recurring | Foreign exchange contracts
Financial assets
Total derivative assets	15
Financial liabilities
Total derivative liabilities	7
Recurring | Interest rate swaps contracts
Financial assets
Total derivative assets	8,033	10,100
Financial liabilities
Total derivative liabilities	12,766	5,263
Recurring | Equity warrants
Financial assets
Total derivative assets	1,911	1,889
Recurring | U.S. Treasury
Financial assets
Investment securities available-for-sale, at fair value	46,774	57,866
Recurring | Agency
Financial assets
Investment securities available-for-sale, at fair value	430,863	432,135
Recurring | Corporate debt
Financial assets
Investment securities available-for-sale, at fair value	555,750	453,861
Recurring | Municipal bonds
Financial assets
Investment securities available-for-sale, at fair value		1,089,913
Recurring | Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	791,115	676,643
Recurring | Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	836,577	1,563,446
Recurring | Level 1
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities with readily determinable fair values	1,035
Total derivative assets	15	0
Financial liabilities
Total derivative liabilities	7
Recurring | Level 1 | Foreign exchange contracts
Financial assets
Total derivative assets	15
Financial liabilities
Total derivative liabilities	7
Recurring | Level 1 | Interest rate swaps contracts
Financial assets
Total derivative assets	0	0
Financial liabilities
Total derivative liabilities	0	0
Recurring | Level 1 | Equity warrants
Financial assets
Total derivative assets	0	0
Recurring | Level 1 | U.S. Treasury
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 1 | Agency
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 1 | Corporate debt
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 1 | Municipal bonds
Financial assets
Investment securities available-for-sale, at fair value		0
Recurring | Level 1 | Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 1 | Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 2
Financial assets
Investment securities available-for-sale, at fair value	2,661,079	4,273,864
Equity securities with readily determinable fair values	0
Total derivative assets	8,033	10,100
Financial liabilities
Total derivative liabilities	12,766
Recurring | Level 2 | Foreign exchange contracts
Financial assets
Total derivative assets	0
Financial liabilities
Total derivative liabilities	0
Recurring | Level 2 | Interest rate swaps contracts
Financial assets
Total derivative assets	8,033	10,100
Financial liabilities
Total derivative liabilities	12,766	5,263
Recurring | Level 2 | Equity warrants
Financial assets
Total derivative assets	0	0
Recurring | Level 2 | U.S. Treasury
Financial assets
Investment securities available-for-sale, at fair value	46,774	57,866
Recurring | Level 2 | Agency
Financial assets
Investment securities available-for-sale, at fair value	430,863	432,135
Recurring | Level 2 | Corporate debt
Financial assets
Investment securities available-for-sale, at fair value	555,750	453,861
Recurring | Level 2 | Municipal bonds
Financial assets
Investment securities available-for-sale, at fair value		1,089,913
Recurring | Level 2 | Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	791,115	676,643
Recurring | Level 2 | Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	836,577	1,563,446
Recurring | Level 3
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities with readily determinable fair values	0
Total derivative assets	1,911	1,889
Financial liabilities
Total derivative liabilities	0
Recurring | Level 3 | Foreign exchange contracts
Financial assets
Total derivative assets	0
Financial liabilities
Total derivative liabilities	0
Recurring | Level 3 | Interest rate swaps contracts
Financial assets
Total derivative assets	0	0
Financial liabilities
Total derivative liabilities	0	0
Recurring | Level 3 | Equity warrants
Financial assets
Total derivative assets	1,911	1,889
Recurring | Level 3 | U.S. Treasury
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 3 | Agency
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 3 | Corporate debt
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 3 | Municipal bonds
Financial assets
Investment securities available-for-sale, at fair value		0
Recurring | Level 3 | Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	0	0
Recurring | Level 3 | Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	$ 0	$ 0