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Fair Value Measurements - Assets and liabilities recorded at fair value on recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | $ 1,368,909 | $ 1,150,885
U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 275,535 | 181,921
Residential mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 932,619 | 825,001
Loans held for sale | 142,196 | 88,205
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 107,122 | 108,113
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 53,633 | 35,850
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loans held for sale | 142,196 | 88,205
Assets measured at fair value on a nonrecurring basis | 1,517,226 | 1,247,716
Derivative liability | 78 | 118
Total liabilities measured at fair value on a recurring basis | 3,697 | 4,208
Recurring | Interest rate swap derivatives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative liability | 133 | 516
Recurring | Interest rate caps |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 3,607 | 3,413
Derivative liability | 3,486 | 3,574
Recurring | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 275,535 | 181,921
Recurring | Residential mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 932,619 | 825,001
Recurring | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 107,122 | 108,113
Recurring | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 53,633 | 35,850
Recurring | Mortgage banking derivatives | Derivative Financial Instruments, Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 2,514 | 5,213
Recurring | Fair Value, Inputs, Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loans held for sale | 0 | 0
Assets measured at fair value on a nonrecurring basis | 0 | 0
Derivative liability | 0 | 0
Total liabilities measured at fair value on a recurring basis | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Interest rate swap derivatives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative liability | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Interest rate caps |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 0 | 0
Derivative liability | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Residential mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Mortgage banking derivatives | Derivative Financial Instruments, Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 0 | 0
Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loans held for sale | 142,196 | 88,205
Assets measured at fair value on a nonrecurring basis | 1,513,212 | 1,241,003
Derivative liability | 78 | 118
Total liabilities measured at fair value on a recurring basis | 3,697 | 4,208
Recurring | Fair Value, Inputs, Level 2 | Interest rate swap derivatives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative liability | 133 | 516
Recurring | Fair Value, Inputs, Level 2 | Interest rate caps |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 3,607 | 3,413
Derivative liability | 3,486 | 3,574
Recurring | Fair Value, Inputs, Level 2 | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 275,535 | 181,921
Recurring | Fair Value, Inputs, Level 2 | Residential mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 932,619 | 825,001
Recurring | Fair Value, Inputs, Level 2 | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 107,122 | 108,113
Recurring | Fair Value, Inputs, Level 2 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 52,133 | 34,350
Recurring | Fair Value, Inputs, Level 2 | Mortgage banking derivatives | Derivative Financial Instruments, Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 0 | 0
Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets measured at fair value on a nonrecurring basis | 4,014 | 6,713
Total liabilities measured at fair value on a recurring basis | 0 | 0
Recurring | Fair Value, Inputs, Level 3 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 1,500 | 1,500
Recurring | Fair Value, Inputs, Level 3 | Mortgage banking derivatives | Derivative Financial Instruments, Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | $ 2,514 | $ 5,213

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