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Fair Value Measurements - Assets and liabilities recorded at fair value on recurring basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | $ 1,680,832 | $ 1,150,885
U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 357,311 | 181,921
Residential mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 1,146,322 | 825,001
Loans held for sale | 55,949 | 88,205
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 100,277 | 108,113
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 76,922 | 35,850
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loans held for sale | 55,949 | 88,205
Assets measured at fair value on a nonrecurring basis | 1,743,397 | 1,247,716
Derivative liability | 74 | 118
Total liabilities measured at fair value on a recurring basis | 5,689 | 4,208
Recurring | Interest rate swap derivatives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative liability | 0 | 516
Recurring | Interest rate caps |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 5,437 | 3,413
Derivative liability | 5,615 | 3,574
Recurring | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 357,311 | 181,921
Recurring | Residential mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 1,146,322 | 825,001
Recurring | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 100,277 | 108,113
Recurring | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 76,922 | 35,850
Recurring | Mortgage banking derivatives | Derivative Financial Instruments, Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 1,179 | 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 | 55,949 | 88,205
Assets measured at fair value on a nonrecurring basis | 1,740,718 | 1,241,003
Derivative liability | 74 | 118
Total liabilities measured at fair value on a recurring basis | 5,689 | 4,208
Recurring | Fair Value, Inputs, Level 2 | Interest rate swap derivatives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative liability | 0 | 516
Recurring | Fair Value, Inputs, Level 2 | Interest rate caps |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 5,437 | 3,413
Derivative liability | 5,615 | 3,574
Recurring | Fair Value, Inputs, Level 2 | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 357,311 | 181,921
Recurring | Fair Value, Inputs, Level 2 | Residential mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 1,146,322 | 825,001
Recurring | Fair Value, Inputs, Level 2 | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 100,277 | 108,113
Recurring | Fair Value, Inputs, Level 2 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities | 75,422 | 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 | 2,679 | 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 | $ 1,179 | $ 5,213

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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