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Fair Value of Financial Instruments - Hierarchy Table on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial assets    
Investment securities available-for-sale, at fair value $ 4,709,815 $ 3,931,115
Derivative assets 8,642  
Financial liabilities    
Derivative liabilities 5,819  
U.S. Treasury    
Financial assets    
Investment securities available-for-sale, at fair value 79,342 32,533
Agency    
Financial assets    
Investment securities available-for-sale, at fair value 530,093 690,386
Corporate    
Financial assets    
Investment securities available-for-sale, at fair value 386,391 415,308
Municipal bonds    
Financial assets    
Investment securities available-for-sale, at fair value 1,255,866 1,446,019
Collateralized mortgage obligations    
Financial assets    
Investment securities available-for-sale, at fair value 662,231 513,366
Mortgage-backed securities    
Financial assets    
Investment securities available-for-sale, at fair value 1,795,892 833,503
Level 1    
Financial assets    
Investment securities available-for-sale, at fair value 0 0
Derivative assets 0 0
Financial liabilities    
Derivative liabilities 0 0
Level 2    
Financial assets    
Investment securities available-for-sale, at fair value 4,709,815 3,931,115
Derivative assets 6,747 12,053
Financial liabilities    
Derivative liabilities 5,819 12,066
Level 3    
Financial assets    
Investment securities available-for-sale, at fair value 0 0
Derivative assets 1,895 1,914
Financial liabilities    
Derivative liabilities 0 0
Recurring    
Financial assets    
Investment securities available-for-sale, at fair value 4,709,815 3,931,115
Derivative assets 8,642 13,967
Financial liabilities    
Derivative liabilities 5,819 12,066
Recurring | Interest rate swaps contracts    
Financial assets    
Derivative assets 6,747 12,053
Recurring | Equity warrants    
Financial assets    
Derivative assets 1,895 1,914
Recurring | U.S. Treasury    
Financial assets    
Investment securities available-for-sale, at fair value 79,342 32,533
Recurring | Agency    
Financial assets    
Investment securities available-for-sale, at fair value 530,093 690,386
Recurring | Corporate    
Financial assets    
Investment securities available-for-sale, at fair value 386,391 415,308
Recurring | Municipal bonds    
Financial assets    
Investment securities available-for-sale, at fair value 1,255,866 1,446,019
Recurring | Collateralized mortgage obligations    
Financial assets    
Investment securities available-for-sale, at fair value 662,231 513,366
Recurring | Mortgage-backed securities    
Financial assets    
Investment securities available-for-sale, at fair value 1,795,892 833,503
Recurring | Level 1    
Financial assets    
Investment securities available-for-sale, at fair value 0 0
Derivative assets 0 0
Financial liabilities    
Derivative liabilities 0 0
Recurring | Level 1 | Interest rate swaps contracts    
Financial assets    
Derivative assets 0 0
Recurring | Level 1 | Equity warrants    
Financial assets    
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 | Municipal bonds    
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 4,709,815 3,931,115
Derivative assets 6,747 12,053
Financial liabilities    
Derivative liabilities 5,819 12,066
Recurring | Level 2 | Interest rate swaps contracts    
Financial assets    
Derivative assets 6,747 12,053
Recurring | Level 2 | Equity warrants    
Financial assets    
Derivative assets 0 0
Recurring | Level 2 | U.S. Treasury    
Financial assets    
Investment securities available-for-sale, at fair value 79,342 32,533
Recurring | Level 2 | Agency    
Financial assets    
Investment securities available-for-sale, at fair value 530,093 690,386
Recurring | Level 2 | Corporate    
Financial assets    
Investment securities available-for-sale, at fair value 386,391 415,308
Recurring | Level 2 | Municipal bonds    
Financial assets    
Investment securities available-for-sale, at fair value 1,255,866 1,446,019
Recurring | Level 2 | Collateralized mortgage obligations    
Financial assets    
Investment securities available-for-sale, at fair value 662,231 513,366
Recurring | Level 2 | Mortgage-backed securities    
Financial assets    
Investment securities available-for-sale, at fair value 1,795,892 833,503
Recurring | Level 3    
Financial assets    
Investment securities available-for-sale, at fair value 0 0
Derivative assets 1,895 1,914
Financial liabilities    
Derivative liabilities 0 0
Recurring | Level 3 | Interest rate swaps contracts    
Financial assets    
Derivative assets 0 0
Recurring | Level 3 | Equity warrants    
Financial assets    
Derivative assets 1,895 1,914
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 | Municipal bonds    
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