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Fair Value Measurements - Assets and liabilities recorded at fair value on recurring basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | $ 1,755,254 | $ 2,623,408
Total liabilities measured at fair value on a recurring basis | 17,693 |
U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 698,057 | 622,387
Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 885,689 | 1,677,673
Loans held for sale | 13,814 | 47,218
Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 109,549 |
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 12,932 | 145,431
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 1,946 | 128,459
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loans held for sale | 13,814 | 47,218
Assets measured at fair value on a nonrecurring basis | 1,787,911 | 2,676,459
Derivative liability | 11 | 47
Total liabilities measured at fair value on a recurring basis |  | 5,194
Recurring | Interest rate caps |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 18,589 | 5,197
Derivative liability | 17,662 | 5,147
Recurring | U.S. treasury bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 47,081 | 49,458
Recurring | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 698,057 | 622,387
Recurring | Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 885,689 | 1,677,673
Recurring | Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 109,549 |
Recurring | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 12,932 | 145,431
Recurring | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 1,946 | 128,459
Recurring | Mortgage banking derivatives | Derivative Financial Instruments, Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 254 | 636
Derivative liability | 20 |
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 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. treasury bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 |
Recurring | Fair Value, Inputs, Level 1 | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 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
Derivative liability | 0 |
Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loans held for sale | 13,814 | 47,218
Assets measured at fair value on a nonrecurring basis | 1,787,657 | 2,663,823
Derivative liability | 11 | 47
Total liabilities measured at fair value on a recurring basis | 17,673 | 5,194
Recurring | Fair Value, Inputs, Level 2 | Interest rate caps |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 18,589 | 5,197
Derivative liability | 17,662 | 5,147
Recurring | Fair Value, Inputs, Level 2 | U.S. treasury bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 47,081 | 49,458
Recurring | Fair Value, Inputs, Level 2 | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 698,057 | 622,387
Recurring | Fair Value, Inputs, Level 2 | Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 885,689 | 1,677,673
Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 109,549 |
Recurring | Fair Value, Inputs, Level 2 | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 12,932 | 145,431
Recurring | Fair Value, Inputs, Level 2 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 1,946 | 116,459
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
Derivative liability | 0 |
Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loans held for sale | 0 | 0
Assets measured at fair value on a nonrecurring basis | 254 | 12,636
Derivative liability | 0 | 0
Total liabilities measured at fair value on a recurring basis | 20 | 0
Recurring | Fair Value, Inputs, Level 3 | 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 3 | U.S. treasury bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 3 | U. S. agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 3 | Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 3 | Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 |
Recurring | Fair Value, Inputs, Level 3 | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 0
Recurring | Fair Value, Inputs, Level 3 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available-for-sale: | 0 | 12,000
Recurring | Fair Value, Inputs, Level 3 | Mortgage banking derivatives | Derivative Financial Instruments, Assets |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative asset | 254 | $ 636
Derivative liability | $ 20 |

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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 https://asc.fasb.org/extlink&oid=126897435&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 https://asc.fasb.org/extlink&oid=124258926&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 https://asc.fasb.org/extlink&oid=124260329&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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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