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Fair Value Measurement - Summary of Financial Assets And Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value | $ 1,186,292 | $ 817,656 |  |
Equity and other securities, at fair value | 8,031 |  |  |
Servicing assets, at fair value | 19,471 | 19,693 | $ 21,400 | $ 21,091
Derivative assets | 7,960 | 10,740 |  |
Derivative liabilities | 8,519 | 4,243 |  |
U.S. Treasury Notes |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value | 41,830 | 52,667 |  |
U.S. Government Agencies |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value | 164,950 | 186,498 |  |
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 | 94,832 | 60,233 |  |
Corporate Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value | 49,330 | 34,173 |  |
Asset-Backed Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value | 44,317 |  |  |
Other Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value |  | 6,609 |  |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Servicing assets, at fair value | 19,471 | 19,693 |  |
Derivative assets | 7,960 | 10,740 |  |
Derivative liabilities | 8,519 | 4,243 |  |
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 | 41,830 | 52,667 |  |
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 | 164,950 | 186,498 |  |
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 | 94,832 | 60,233 |  |
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 | 490,236 | 272,963 |  |
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 | 109,822 | 83,621 |  |
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 | 159,701 | 90,434 |  |
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 | 31,274 | 30,458 |  |
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 | 49,330 | 34,173 |  |
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 | 44,317 |  |  |
Fair Value, Measurements, Recurring | Other Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value |  | 6,609 |  |
Fair Value, Measurements, Recurring | Mutual Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
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] |  |  |  |
Equity and other securities, at fair value | 5,079 |  |  |
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 | 41,830 | 52,667 |  |
Fair Value, Measurements, Recurring | Level 1 | Other Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value |  | 2,844 |  |
Fair Value, Measurements, Recurring | Level 1 | Mutual Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Equity and other securities, at fair value | 2,952 |  |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 7,960 | 10,740 |  |
Derivative liabilities | 8,519 | 4,243 |  |
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 | 164,950 | 186,498 |  |
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 | 94,832 | 60,233 |  |
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 | 490,236 | 272,963 |  |
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 | 109,822 | 83,621 |  |
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 | 159,701 | 90,434 |  |
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 | 31,274 | 30,458 |  |
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 | 49,330 | 34,173 |  |
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 | 44,317 |  |  |
Fair Value, Measurements, Recurring | Level 2 | Other Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value |  | 3,074 |  |
Fair Value, Measurements, Recurring | Level 2 | Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Equity and other securities, at fair value | 4,379 |  |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Servicing assets, at fair value | 19,471 | 19,693 |  |
Fair Value, Measurements, Recurring | Level 3 | 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 |  | 195 |  |
Fair Value, Measurements, Recurring | Level 3 | Other Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value |  | $ 691 |  |
Fair Value, Measurements, Recurring | Level 3 | Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Equity and other securities, at fair value | $ 700 |  |  |

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