Fair Value of Financial Instruments - Hierarchy Table on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets
Investment securities available-for-sale, at fair value	$ 1,914,599	$ 2,601,013
Total derivative assets	66,350	78,129
Financial liabilities
Total derivative liabilities	15,030	12,598
U.S. Treasury
Financial assets
Investment securities available-for-sale, at fair value	12,914	47,017
Agency
Financial assets
Investment securities available-for-sale, at fair value	405,514	431,438
Corporate
Financial assets
Investment securities available-for-sale, at fair value	504,808	542,548
Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	304,330	764,229
Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	687,033	815,781
Level 1
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities	898	925
Total derivative assets	22	1
Financial liabilities
Total derivative liabilities	0	1
Level 2
Financial assets
Investment securities available-for-sale, at fair value	1,914,599	2,601,013
Equity securities	0	0
Total derivative assets	8,198	7,053
Financial liabilities
Total derivative liabilities	15,176	12,530
Level 3
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities	0	0
Total derivative assets	391	1,894
Financial liabilities
Total derivative liabilities	0	0
Recurring
Financial assets
Investment securities available-for-sale, at fair value	1,914,599	2,601,013
Equity securities	898	13,526
Total derivative assets	8,611	8,948
Financial liabilities
Total derivative liabilities	15,176	12,531
Equity securities that are measured at NAV		12,600
Recurring | Foreign exchange contracts
Financial assets
Total derivative assets	22	1
Financial liabilities
Total derivative liabilities		1
Recurring | Interest rate swaps contracts
Financial assets
Total derivative assets	8,198	7,053
Financial liabilities
Total derivative liabilities	15,176	12,530
Recurring | Equity warrants
Financial assets
Total derivative assets	391	1,894
Recurring | U.S. Treasury
Financial assets
Investment securities available-for-sale, at fair value	12,914	47,017
Recurring | Agency
Financial assets
Investment securities available-for-sale, at fair value	405,514	431,438
Recurring | Corporate
Financial assets
Investment securities available-for-sale, at fair value	504,808	542,548
Recurring | Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	304,330	764,229
Recurring | Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	687,033	815,781
Recurring | Level 1
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities	898	925
Total derivative assets	22	1
Financial liabilities
Total derivative liabilities	0	1
Recurring | Level 1 | Foreign exchange contracts
Financial assets
Total derivative assets	22	1
Financial liabilities
Total derivative liabilities		1
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
Financial assets
Investment securities available-for-sale, at fair value	0	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	1,914,599	2,601,013
Equity securities	0	0
Total derivative assets	8,198	7,053
Financial liabilities
Total derivative liabilities	15,176	12,530
Recurring | Level 2 | Foreign exchange contracts
Financial assets
Total derivative assets	0	0
Financial liabilities
Total derivative liabilities		0
Recurring | Level 2 | Interest rate swaps contracts
Financial assets
Total derivative assets	8,198	7,053
Financial liabilities
Total derivative liabilities	15,176	12,530
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	12,914	47,017
Recurring | Level 2 | Agency
Financial assets
Investment securities available-for-sale, at fair value	405,514	431,438
Recurring | Level 2 | Corporate
Financial assets
Investment securities available-for-sale, at fair value	504,808	542,548
Recurring | Level 2 | Collateralized mortgage obligations
Financial assets
Investment securities available-for-sale, at fair value	304,330	764,229
Recurring | Level 2 | Mortgage-backed securities
Financial assets
Investment securities available-for-sale, at fair value	687,033	815,781
Recurring | Level 3
Financial assets
Investment securities available-for-sale, at fair value	0	0
Equity securities	0	0
Total derivative assets	391	1,894
Financial liabilities
Total derivative liabilities	0	0
Recurring | Level 3 | Foreign exchange contracts
Financial assets
Total derivative assets	0	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	391	1,894
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
Financial assets
Investment securities available-for-sale, at fair value	0	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