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Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | $ 1,509,211 |  | $ 1,186,292 |  |  |
Servicing assets, at fair value | 21,267 | $ 18,351 | 19,471 | $ 19,939 | $ 19,760 | $ 19,693
Derivative assets | 19,133 |  | 7,960 |  |  |
Derivative liabilities | 20,327 |  | 8,519 |  |  |
Equity and other securities, at fair value | 8,335 |  | 8,031 |  |  |
U.S. Treasury Notes |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 25,951 |  | 41,830 |  |  |
U.S. Government Agencies |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 104,710 |  | 164,950 |  |  |
Obligations of States, Municipalities, and Political Subdivisions |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 108,312 |  | 94,832 |  |  |
Corporate Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 57,208 |  | 49,330 |  |  |
Asset-Backed Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 49,522 |  | 44,317 |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Servicing assets, at fair value | 21,267 |  | 19,471 |  |  |
Derivative assets | 19,133 |  | 7,960 |  |  |
Derivative liabilities | 20,327 |  | 8,519 |  |  |
Fair Value, Measurements, Recurring | Mutual Funds |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 2,992 |  |  |  |  |
Equity and other securities, at fair value |  |  | 2,952 |  |  |
Fair Value, Measurements, Recurring | Equity Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 5,343 |  |  |  |  |
Equity and other securities, at fair value |  |  | 5,079 |  |  |
Fair Value, Measurements, Recurring | U.S. Treasury Notes |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 25,951 |  | 41,830 |  |  |
Fair Value, Measurements, Recurring | U.S. Government Agencies |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 104,710 |  | 164,950 |  |  |
Fair Value, Measurements, Recurring | Obligations of States, Municipalities, and Political Subdivisions |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 108,312 |  | 94,832 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Residential | Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 824,037 |  | 490,236 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Residential | Non-Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 64,096 |  | 109,822 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Commercial | Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 263,732 |  | 159,701 |  |  |
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Commercial | Non-Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 11,643 |  | 31,274 |  |  |
Fair Value, Measurements, Recurring | Corporate Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 57,208 |  | 49,330 |  |  |
Fair Value, Measurements, Recurring | Asset-Backed Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 49,522 |  | 44,317 |  |  |
Fair Value, Measurements, Recurring | Level 1 | Mutual Funds |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 2,992 |  |  |  |  |
Equity and other securities, at fair value |  |  | 2,952 |  |  |
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Notes |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 25,951 |  | 41,830 |  |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 19,133 |  | 7,960 |  |  |
Derivative liabilities | 20,327 |  | 8,519 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Equity Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 4,659 |  |  |  |  |
Equity and other securities, at fair value |  |  | 4,379 |  |  |
Fair Value, Measurements, Recurring | Level 2 | U.S. Government Agencies |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 104,710 |  | 164,950 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Obligations of States, Municipalities, and Political Subdivisions |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 108,312 |  | 94,832 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Residential | Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 824,037 |  | 490,236 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Residential | Non-Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 64,096 |  | 109,822 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Commercial | Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 263,732 |  | 159,701 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Commercial | Non-Agency |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 11,643 |  | 31,274 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Corporate Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 57,208 |  | 49,330 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Asset-Backed Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | 49,522 |  | 44,317 |  |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Servicing assets, at fair value | 21,267 |  | 19,471 |  |  |
Fair Value, Measurements, Recurring | Level 3 | Equity Securities |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities available-for-sale, at fair value | $ 684 |  |  |  |  |
Equity and other securities, at fair value |  |  | $ 700 |  |  |

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